Javascript Notes for Professionals

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✦ Synopsis

The JavaScript® Notes for Professionals book is compiled from Stack Overflow Documentation, the content is written by the beautiful people at Stack Overflow. Text content is released under Creative Commons BY-SA. See credits at the end of this book whom contributed to the various chapters. Images may be copyright of their respective owners unless otherwise specified

✦ Table of Contents

Content list
About
Chapter 1: Getting started with JavaScript
Section 1.1: Using console.log()
Section 1.2: Using the DOM API
Section 1.3: Using window.alert()
Section 1.4: Using window.prompt()
Section 1.5: Using window.confirm()
Section 1.6: Using the DOM API (with graphical text: Canvas, SVG, or image file)
Chapter 2: JavaScript Variables
Section 2.1: Defining a Variable
Section 2.2: Using a Variable
Section 2.3: Types of Variables
Section 2.4: Arrays and Objects
Chapter 3: Built-in Constants
Section 3.1: null
Section 3.2: Testing for NaN using isNaN()
Section 3.3: NaN
Section 3.4: undefined and null
Section 3.5: Infinity and -Infinity
Section 3.6: Number constants
Section 3.7: Operations that return NaN
Section 3.8: Math library functions that return NaN
Chapter 4: Comments
Section 4.1: Using Comments
Section 4.2: Using HTML comments in JavaScript (Bad practice)
Chapter 5: Console
Section 5.1: Measuring time - console.time()
Section 5.2: Formatting console output
Section 5.3: Printing to a browser's debugging console
Section 5.4: Including a stack trace when logging - console.trace()
Section 5.5: Tabulating values - console.table()
Section 5.6: Counting - console.count()
Section 5.7: Clearing the console - console.clear()
Section 5.8: Displaying objects and XML interactively - console.dir(), console.dirxml()
Section 5.9: Debugging with assertions - console.assert()
Chapter 6: Datatypes in JavaScript
Section 6.1: typeof
Section 6.2: Finding an object's class
Section 6.3: Getting object type by constructor name
Chapter 7: Strings
Section 7.1: Basic Info and String Concatenation
Section 7.2: Reverse String
Section 7.3: Comparing Strings Lexicographically
Section 7.4: Access character at index in string
Section 7.5: Escaping quotes
Section 7.6: Word Counter
Section 7.7: Trim whitespace
Section 7.8: Splitting a string into an array
Section 7.9: Strings are unicode
Section 7.10: Detecting a string
Section 7.11: Substrings with slice
Section 7.12: Character code
Section 7.13: String Representations of Numbers
Section 7.14: String Find and Replace Functions
Section 7.15: Find the index of a substring inside a string
Section 7.16: String to Upper Case
Section 7.17: String to Lower Case
Section 7.18: Repeat a String
Chapter 8: Date
Section 8.1: Create a new Date object
Section 8.2: Convert to a string format
Section 8.3: Creating a Date from UTC
Section 8.4: Formatting a JavaScript date
Section 8.5: Get the number of milliseconds elapsed since 1 January 1970 00:00:00 UTC
Section 8.6: Get the current time and date
Section 8.7: Increment a Date Object
Section 8.8: Convert to JSON
Chapter 9: Date Comparison
Section 9.1: Comparing Date values
Section 9.2: Date Dierence Calculation
Chapter 10: Comparison Operations
Section 10.1: Abstract equality / inequality and type conversion
Section 10.2: NaN Property of the Global Object
Section 10.3: Short-circuiting in boolean operators
Section 10.4: Null and Undefined
Section 10.5: Abstract Equality (==)
Section 10.6: Logic Operators with Booleans
Section 10.7: Automatic Type Conversions
Section 10.8: Logic Operators with Non-boolean values (boolean coercion)
Section 10.9: Empty Array
Section 10.10: Equality comparison operations
Section 10.11: Relational operators (<, <=, >, >=)
Section 10.12: Inequality
Section 10.13: List of Comparison Operators
Section 10.14: Grouping multiple logic statements
Section 10.15: Bit fields to optimise comparison of multi state data
Chapter 11: Conditions
Section 11.1: Ternary operators
Section 11.2: Switch statement
Section 11.3: If / Else If / Else Control
Section 11.4: Strategy
Section 11.5: Using || and && short circuiting
Chapter 12: Arrays
Section 12.1: Converting Array-like Objects to Arrays
Section 12.2: Reducing values
Section 12.3: Mapping values
Section 12.4: Filtering Object Arrays
Section 12.5: Sorting Arrays
Section 12.6: Iteration
Section 12.7: Destructuring an array
Section 12.8: Removing duplicate elements
Section 12.9: Array comparison
Section 12.10: Reversing arrays
Section 12.11: Shallow cloning an array
Section 12.12: Concatenating Arrays
Section 12.13: Merge two array as key value pair
Section 12.14: Array spread / rest
Section 12.15: Filtering values
Section 12.16: Searching an Array
Section 12.17: Convert a String to an Array
Section 12.18: Removing items from an array
Section 12.19: Removing all elements
Section 12.20: Finding the minimum or maximum element
Section 12.21: Standard array initialization
Section 12.22: Joining array elements in a string
Section 12.23: Removing/Adding elements using splice()
Section 12.24: The entries() method
Section 12.25: Remove value from array
Section 12.26: Flattening Arrays
Section 12.27: Append / Prepend items to Array
Section 12.28: Object keys and values to array
Section 12.29: Logical connective of values
Section 12.30: Checking if an object is an Array
Section 12.31: Insert an item into an array at a specific index
Section 12.32: Sorting multidimensional array
Section 12.33: Test all array items for equality
Section 12.34: Copy part of an Array
Chapter 13: Objects
Section 13.1: Shallow cloning
Section 13.2: Object.freeze
Section 13.3: Object cloning
Section 13.4: Object properties iteration
Section 13.5: Object.assign
Section 13.6: Object rest/spread (...)
Section 13.7: Object.defineProperty
Section 13.8: Accesor properties (get and set)
Section 13.9: Dynamic / variable property names
Section 13.10: Arrays are Objects
Section 13.11: Object.seal
Section 13.12: Convert object's values to array
Section 13.13: Retrieving properties from an object
Section 13.14: Read-Only property
Section 13.15: Non enumerable property
Section 13.16: Lock property description
Section 13.17: Object.getOwnPropertyDescriptor
Section 13.18: Descriptors and Named Properties
Section 13.19: Object.keys
Section 13.20: Properties with special characters or reserved words
Section 13.21: Creating an Iterable object
Section 13.22: Iterating over Object entries - Object.entries()
Section 13.23: Object.values()
Chapter 14: Arithmetic (Math)
Section 14.1: Constants
Section 14.2: Remainder / Modulus (%)
Section 14.3: Rounding
Section 14.4: Trigonometry
Section 14.5: Bitwise operators
Section 14.6: Incrementing (++)
Section 14.7: Exponentiation (Math.pow() or *)
Section 14.8: Random Integers and Floats
Section 14.9: Addition (+)
Section 14.10: Little / Big endian for typed arrays when using bitwise operators
Section 14.11: Get Random Between Two Numbers
Section 14.12: Simulating events with dierent probabilities
Section 14.13: Subtraction (-)
Section 14.14: Multiplication ()
Section 14.15: Getting maximum and minimum
Section 14.16: Restrict Number to Min/Max Range
Section 14.17: Ceiling and Floor
Section 14.18: Getting roots of a number
Section 14.19: Random with gaussian distribution
Section 14.20: Math.atan2 to find direction
Section 14.21: Sin & Cos to create a vector given direction & distance
Section 14.22: Math.hypot
Section 14.23: Periodic functions using Math.sin
Section 14.24: Division (/)
Section 14.25: Decrementing (--)
Chapter 15: Bitwise operators
Section 15.1: Bitwise operators
Section 15.2: Shift Operators
Chapter 16: Constructor functions
Section 16.1: Declaring a constructor function
Chapter 17: Declarations and Assignments
Section 17.1: Modifying constants
Section 17.2: Declaring and initializing constants
Section 17.3: Declaration
Section 17.4: Undefined
Section 17.5: Data Types
Section 17.6: Mathematic operations and assignment
Section 17.7: Assignment
Chapter 18: Loops
Section 18.1: Standard "for" loops
Section 18.2: "for ... of" loop
Section 18.3: "for ... in" loop
Section 18.4: "while" Loops
Section 18.5: "continue" a loop
Section 18.6: Break specific nested loops
Section 18.7: "do ... while" loop
Section 18.8: Break and continue labels
Chapter 19: Functions
Section 19.1: Function Scoping
Section 19.2: Currying
Section 19.3: Immediately Invoked Function Expressions
Section 19.4: Named Functions
Section 19.5: Binding this and arguments
Section 19.6: Functions with an Unknown Number of Arguments (variadic functions)
Section 19.7: Anonymous Function
Section 19.8: Default parameters
Section 19.9: Call and apply
Section 19.10: Partial Application
Section 19.11: Passing arguments by reference or value
Section 19.12: Function Arguments, "arguments" object, rest and spread parameters
Section 19.13: Function Composition
Section 19.14: Get the name of a function object
Section 19.15: Recursive Function
Section 19.16: Using the Return Statement
Section 19.17: Functions as a variable
Chapter 20: Functional JavaScript
Section 20.1: Higher-Order Functions
Section 20.2: Identity Monad
Section 20.3: Pure Functions
Section 20.4: Accepting Functions as Arguments
Chapter 21: Prototypes, objects
Section 21.1: Creation and initialising Prototype
Chapter 22: Classes
Section 22.1: Class Constructor
Section 22.2: Class Inheritance
Section 22.3: Static Methods
Section 22.4: Getters and Setters
Section 22.5: Private Members
Section 22.6: Methods
Section 22.7: Dynamic Method Names
Section 22.8: Managing Private Data with Classes
Section 22.9: Class Name binding
Chapter 23: Namespacing
Section 23.1: Namespace by direct assignment
Section 23.2: Nested Namespaces
Chapter 24: Context (this)
Section 24.1: this with simple objects
Section 24.2: Saving this for use in nested functions / objects
Section 24.3: Binding function context
Section 24.4: this in constructor functions
Chapter 25: Setters and Getters
Section 25.1: Defining a Setter/Getter Using Object.defineProperty
Section 25.2: Defining an Setter/Getter in a Newly Created Object
Section 25.3: Defining getters and setters in ES6 class
Chapter 26: Events
Section 26.1: Page, DOM and Browser loading
Chapter 27: Inheritance
Section 27.1: Standard function prototype
Section 27.2: Dierence between Object.key and Object.prototype.key
Section 27.3: Prototypal inheritance
Section 27.4: Pseudo-classical inheritance
Section 27.5: Setting an Object's prototype
Chapter 28: Method Chaining
Section 28.1: Chainable object design and chaining
Section 28.2: Method Chaining
Chapter 29: Callbacks
Section 29.1: Simple Callback Usage Examples
Section 29.2: Continuation (synchronous and asynchronous)
Section 29.3: What is a callback?
Section 29.4: Callbacks and this
Section 29.5: Callback using Arrow function
Section 29.6: Error handling and control-flow branching
Chapter 30: Intervals and Timeouts
Section 30.1: Recursive setTimeout
Section 30.2: Intervals
Section 30.3: Intervals
Section 30.4: Removing intervals
Section 30.5: Removing timeouts
Section 30.6: setTimeout, order of operations, clearTimeout
Chapter 31: Regular expressions
Section 31.1: Creating a RegExp Object
Section 31.2: RegExp Flags
Section 31.3: Check if string contains pattern using .test()
Section 31.4: Matching With .exec()
Section 31.5: Using RegExp With Strings
Section 31.6: RegExp Groups
Section 31.7: Replacing string match with a callback function
Section 31.8: Using Regex.exec() with parentheses regex to extract matches of a string
Chapter 32: Cookies
Section 32.1: Test if cookies are enabled
Section 32.2: Adding and Setting Cookies
Section 32.3: Reading cookies
Section 32.4: Removing cookies
Chapter 33: Web Storage
Section 33.1: Using localStorage
Section 33.2: Simpler way of handling Storage
Section 33.3: Storage events
Section 33.4: sessionStorage
Section 33.5: localStorage length
Section 33.6: Error conditions
Section 33.7: Clearing storage
Section 33.8: Remove Storage Item
Chapter 34: Data attributes
Section 34.1: Accessing data attributes
Chapter 35: JSON
Section 35.1: JSON versus JavaScript literals
Section 35.2: Parsing with a reviver function
Section 35.3: Serializing a value
Section 35.4: Serializing and restoring class instances
Section 35.5: Serializing with a replacer function
Section 35.6: Parsing a simple JSON string
Section 35.7: Cyclic object values
Chapter 36: AJAX
Section 36.1: Sending and Receiving JSON Data via POST
Section 36.2: Add an AJAX preloader
Section 36.3: Displaying the top JavaScript questions of the month from Stack Overflow's API
Section 36.4: Using GET with parameters
Section 36.5: Check if a file exists via a HEAD request
Section 36.6: Using GET and no parameters
Section 36.7: Listening to AJAX events at a global level
Chapter 37: Enumerations
Section 37.1: Enum definition using Object.freeze()
Section 37.2: Alternate definition
Section 37.3: Printing an enum variable
Section 37.4: Implementing Enums Using Symbols
Section 37.5: Automatic Enumeration Value
Chapter 38: Map
Section 38.1: Creating a Map
Section 38.2: Clearing a Map
Section 38.3: Removing an element from a Map
Section 38.4: Checking if a key exists in a Map
Section 38.5: Iterating Maps
Section 38.6: Getting and setting elements
Section 38.7: Getting the number of elements of a Map
Chapter 39: Timestamps
Section 39.1: High-resolution timestamps
Section 39.2: Get Timestamp in Seconds
Section 39.3: Low-resolution timestamps
Section 39.4: Support for legacy browsers
Chapter 40: Unary Operators
Section 40.1: Overview
Section 40.2: The typeof operator
Section 40.3: The delete operator
Section 40.4: The unary plus operator (+)
Section 40.5: The void operator
Section 40.6: The unary negation operator (-)
Section 40.7: The bitwise NOT operator (~)
Section 40.8: The logical NOT operator (!)
Chapter 41: Generators
Section 41.1: Generator Functions
Section 41.2: Sending Values to Generator
Section 41.3: Delegating to other Generator
Section 41.4: Iteration
Section 41.5: Async flow with generators
Section 41.6: Iterator-Observer interface
Chapter 42: Promises
Section 42.1: Introduction
Section 42.2: Promise chaining
Section 42.3: Waiting for multiple concurrent promises
Section 42.4: Reduce an array to chained promises
Section 42.5: Waiting for the first of multiple concurrent promises
Section 42.6: "Promisifying" functions with callbacks
Section 42.7: Error Handling
Section 42.8: Reconciling synchronous and asynchronous operations
Section 42.9: Delay function call
Section 42.10: "Promisifying" values
Section 42.11: Using ES2017 async/await
Section 42.12: Performing cleanup with finally()
Section 42.13: forEach with promises
Section 42.14: Asynchronous API request
Chapter 43: Set
Section 43.1: Creating a Set
Section 43.2: Adding a value to a Set
Section 43.3: Removing value from a set
Section 43.4: Checking if a value exist in a set
Section 43.5: Clearing a Set
Section 43.6: Getting set length
Section 43.7: Converting Sets to arrays
Section 43.8: Intersection and dierence in Sets
Section 43.9: Iterating Sets
Chapter 44: Modals - Prompts
Section 44.1: About User Prompts
Section 44.2: Persistent Prompt Modal
Section 44.3: Confirm to Delete element
Section 44.4: Usage of alert()
Section 44.5: Usage of prompt()
Chapter 45: execCommand and contenteditable
Section 45.1: Listening to Changes of contenteditable
Section 45.2: Getting started
Section 45.3: Copy to clipboard from textarea using execCommand("copy")
Section 45.4: Formatting
Chapter 46: History
Section 46.1: history.pushState()
Section 46.2: history.replaceState()
Section 46.3: Load a specific URL from the history list
Chapter 47: Navigator Object
Section 47.1: Get some basic browser data and return it as a JSON object
Chapter 48: BOM (Browser Object Model)
Section 48.1: Introduction
Section 48.2: Window Object Properties
Section 48.3: Window Object Methods
Chapter 49: The Event Loop
Section 49.1: The event loop in a web browser
Section 49.2: Asynchronous operations and the event loop
Chapter 50: Strict mode
Section 50.1: For entire scripts
Section 50.2: For functions
Section 50.3: Changes to properties
Section 50.4: Changes to global properties
Section 50.5: Duplicate Parameters
Section 50.6: Function scoping in strict mode
Section 50.7: Behaviour of a function's arguments list
Section 50.8: Non-Simple parameter lists
Chapter 51: Custom Elements
Section 51.1: Extending Native Elements
Section 51.2: Registering New Elements
Chapter 52: Data Manipulation
Section 52.1: Format numbers as money
Section 52.2: Extract extension from file name
Section 52.3: Set object property given its string name
Chapter 53: Binary Data
Section 53.1: Getting binary representation of an image file
Section 53.2: Converting between Blobs and ArrayBuers
Section 53.3: Manipulating ArrayBuers with DataViews
Section 53.4: Creating a TypedArray from a Base64 string
Section 53.5: Using TypedArrays
Section 53.6: Iterating through an arrayBuer
Chapter 54: Template Literals
Section 54.1: Basic interpolation and multiline strings
Section 54.2: Tagged strings
Section 54.3: Raw strings
Section 54.4: Templating HTML With Template Strings
Section 54.5: Introduction
Chapter 55: Fetch
Section 55.1: Getting JSON data
Section 55.2: Set Request Headers
Section 55.3: POST Data
Section 55.4: Send cookies
Section 55.5: GlobalFetch
Section 55.6: Using Fetch to Display Questions from the Stack Overflow API
Chapter 56: Scope
Section 56.1: Closures
Section 56.2: Hoisting
Section 56.3: Dierence between var and let
Section 56.4: Apply and Call syntax and invocation
Section 56.5: Arrow function invocation
Section 56.6: Bound invocation
Section 56.7: Method invocation
Section 56.8: Anonymous invocation
Section 56.9: Constructor invocation
Section 56.10: Using let in loops instead of var (click handlers example)
Chapter 57: Modules
Section 57.1: Defining a module
Section 57.2: Default exports
Section 57.3: Importing named members from another module
Section 57.4: Importing an entire module
Section 57.5: Importing named members with aliases
Section 57.6: Importing with side eects
Section 57.7: Exporting multiple named members
Chapter 58: Screen
Section 58.1: Getting the screen resolution
Section 58.2: Getting the “available” area of the screen
Section 58.3: Page width and height
Section 58.4: Window innerWidth and innerHeight Properties
Section 58.5: Getting color information about the screen
Chapter 59: Variable coercion/conversion
Section 59.1: Double Negation (!!x)
Section 59.2: Implicit conversion
Section 59.3: Converting to boolean
Section 59.4: Converting a string to a number
Section 59.5: Converting a number to a string
Section 59.6: Primitive to Primitive conversion table
Section 59.7: Convert an array to a string
Section 59.8: Array to String using array methods
Section 59.9: Converting a number to a boolean
Section 59.10: Converting a string to a boolean
Section 59.11: Integer to Float
Section 59.12: Float to Integer
Section 59.13: Convert string to float
Chapter 60: Destructuring assignment
Section 60.1: Destructuring Objects
Section 60.2: Destructuring function arguments
Section 60.3: Nested Destructuring
Section 60.4: Destructuring Arrays
Section 60.5: Destructuring inside variables
Section 60.6: Default Value While Destructuring
Section 60.7: Renaming Variables While Destructuring
Chapter 61: WebSockets
Section 61.1: Working with string messages
Section 61.2: Establish a web socket connection
Section 61.3: Working with binary messages
Section 61.4: Making a secure web socket connection
Chapter 62: Arrow Functions
Section 62.1: Introduction
Section 62.2: Lexical Scoping & Binding (Value of "this")
Section 62.3: Arguments Object
Section 62.4: Implicit Return
Section 62.5: Arrow functions as a constructor
Section 62.6: Explicit Return
Chapter 63: Workers
Section 63.1: Web Worker
Section 63.2: A simple service worker
Section 63.3: Register a service worker
Section 63.4: Communicating with a Web Worker
Section 63.5: Terminate a worker
Section 63.6: Populating your cache
Section 63.7: Dedicated Workers and Shared Workers
Chapter 64: requestAnimationFrame
Section 64.1: Use requestAnimationFrame to fade in element
Section 64.2: Keeping Compatibility
Section 64.3: Cancelling an Animation
Chapter 65: Creational Design Patterns
Section 65.1: Factory Functions
Section 65.2: Factory with Composition
Section 65.3: Module and Revealing Module Patterns
Section 65.4: Prototype Pattern
Section 65.5: Singleton Pattern
Section 65.6: Abstract Factory Pattern
Chapter 66: Detecting browser
Section 66.1: Feature Detection Method
Section 66.2: User Agent Detection
Section 66.3: Library Method
Chapter 67: Symbols
Section 67.1: Basics of symbol primitive type
Section 67.2: Using Symbol.for() to create global, shared symbols
Section 67.3: Converting a symbol into a string
Chapter 68: Transpiling
Section 68.1: Introduction to Transpiling
Section 68.2: Start using ES6/7 with Babel
Chapter 69: Automatic Semicolon Insertion - ASI
Section 69.1: Avoid semicolon insertion on return statements
Section 69.2: Rules of Automatic Semicolon Insertion
Section 69.3: Statements aected by automatic semicolon insertion
Chapter 70: Localization
Section 70.1: Number formatting
Section 70.2: Currency formatting
Section 70.3: Date and time formatting
Chapter 71: Geolocation
Section 71.1: Get updates when a user's location changes
Section 71.2: Get a user's latitude and longitude
Section 71.3: More descriptive error codes
Chapter 72: IndexedDB
Section 72.1: Opening a database
Section 72.2: Adding objects
Section 72.3: Retrieving data
Section 72.4: Testing for IndexedDB availability
Chapter 73: Modularization Techniques
Section 73.1: ES6 Modules
Section 73.2: Universal Module Definition (UMD)
Section 73.3: Immediately invoked function expressions (IIFE)
Section 73.4: Asynchronous Module Definition (AMD)
Section 73.5: CommonJS - Node.js
Chapter 74: Proxy
Section 74.1: Proxying property lookup
Section 74.2: Very simple proxy (using the set trap)
Chapter 75: .postMessage() and MessageEvent
Section 75.1: Getting Started
Chapter 76: WeakMap
Section 76.1: Creating a WeakMap object
Section 76.2: Getting a value associated to the key
Section 76.3: Assigning a value to the key
Section 76.4: Checking if an element with the key exists
Section 76.5: Removing an element with the key
Section 76.6: Weak reference demo
Chapter 77: WeakSet
Section 77.1: Creating a WeakSet object
Section 77.2: Adding a value
Section 77.3: Checking if a value exists
Section 77.4: Removing a value
Chapter 78: Escape Sequences
Section 78.1: Entering special characters in strings and regular expressions
Section 78.2: Escape sequence types
Chapter 79: Behavioral Design Patterns
Section 79.1: Observer pattern
Section 79.2: Mediator Pattern
Section 79.3: Command
Section 79.4: Iterator
Chapter 80: Server-sent events
Section 80.1: Setting up a basic event stream to the server
Section 80.2: Closing an event stream
Section 80.3: Binding event listeners to EventSource
Chapter 81: Async functions (async/await)
Section 81.1: Introduction
Section 81.2: Await and operator precedence
Section 81.3: Async functions compared to Promises
Section 81.4: Looping with async await
Section 81.5: Less indentation
Section 81.6: Simultaneous async (parallel) operations
Chapter 82: Async Iterators
Section 82.1: Basics
Chapter 83: How to make iterator usable inside async callback function
Section 83.1: Erroneous code, can you spot why this usage of key will lead to bugs?
Section 83.2: Correct Writing
Chapter 84: Tail Call Optimization
Section 84.1: What is Tail Call Optimization (TCO)
Section 84.2: Recursive loops
Chapter 85: Bitwise Operators - Real World Examples (snippets)
Section 85.1: Swapping Two Integers with Bitwise XOR (without additional memory allocation)
Section 85.2: Faster multiplication or division by powers of 2
Section 85.3: Number's Parity Detection with Bitwise AND
Chapter 86: Tilde ~
Section 86.1: ~ Integer
Section 86.2: ~~ Operator
Section 86.3: Converting Non-numeric values to Numbers
Section 86.4: Shorthands
Section 86.5: ~ Decimal
Chapter 87: Using JavaScript to get/set CSS custom variables
Section 87.1: How to get and set CSS variable property values
Chapter 88: Selection API
Section 88.1: Get the text of the selection
Section 88.2: Deselect everything that is selected
Section 88.3: Select the contents of an element
Chapter 89: File API, Blobs and FileReaders
Section 89.1: Read file as string
Section 89.2: Read file as dataURL
Section 89.3: Slice a file
Section 89.4: Get the properties of the file
Section 89.5: Selecting multiple files and restricting file types
Section 89.6: Client side csv download using Blob
Chapter 90: Notifications API
Section 90.1: Requesting Permission to send notifications
Section 90.2: Sending Notifications
Section 90.3: Closing a notification
Section 90.4: Notification events
Chapter 91: Vibration API
Section 91.1: Single vibration
Section 91.2: Check for support
Section 91.3: Vibration patterns
Chapter 92: Battery Status API
Section 92.1: Battery Events
Section 92.2: Getting current battery level
Section 92.3: Is battery charging?
Section 92.4: Get time left until battery is empty
Section 92.5: Get time left until battery is fully charged
Chapter 93: Fluent API
Section 93.1: Fluent API capturing construction of HTML articles with JS
Chapter 94: Web Cryptography API
Section 94.1: Creating digests (e.g. SHA-256)
Section 94.2: Cryptographically random data
Section 94.3: Generating RSA key pair and converting to PEM format
Section 94.4: Converting PEM key pair to CryptoKey
Chapter 95: Security issues
Section 95.1: Reflected Cross-site scripting (XSS)
Section 95.2: Persistent Cross-site scripting (XSS)
Section 95.3: Persistent Cross-site scripting from JavaScript string literals
Section 95.4: Why scripts from other people can harm your website and its visitors
Section 95.5: Evaled JSON injection
Chapter 96: Same Origin Policy & Cross-Origin Communication
Section 96.1: Safe cross-origin communication with messages
Section 96.2: Ways to circumvent Same-Origin Policy
Chapter 97: Error Handling
Section 97.1: Error objects
Section 97.2: Interaction with Promises
Section 97.3: Error types
Section 97.4: Order of operations plus advanced thoughts
Chapter 98: Global error handling in browsers
Section 98.1: Handling window.onerror to report all errors back to the server-side
Chapter 99: Debugging
Section 99.1: Interactive interpreter variables
Section 99.2: Breakpoints
Section 99.3: Using setters and getters to find what changed a property
Section 99.4: Using the console
Section 99.5: Automatically pausing execution
Section 99.6: Elements inspector
Section 99.7: Break when a function is called
Section 99.8: Stepping through code
Chapter 100: Unit Testing JavaScript
Section 100.1: Unit Testing Promises with Mocha, Sinon, Chai and Proxyquire
Section 100.2: Basic Assertion
Chapter 101: Evaluating JavaScript
Section 101.1: Evaluate a string of JavaScript statements
Section 101.2: Introduction
Section 101.3: Evaluation and Math
Chapter 102: Linters - Ensuring code quality
Section 102.1: JSHint
Section 102.2: ESLint / JSCS
Section 102.3: JSLint
Chapter 103: Anti-patterns
Section 103.1: Chaining assignments in var declarations
Chapter 104: Performance Tips
Section 104.1: Avoid try/catch in performance-critical functions
Section 104.2: Limit DOM Updates
Section 104.3: Benchmarking your code - measuring execution time
Section 104.4: Use a memoizer for heavy-computing functions
Section 104.5: Initializing object properties with null
Section 104.6: Reuse objects rather than recreate
Section 104.7: Prefer local variables to globals, attributes, and indexed values
Section 104.8: Be consistent in use of Numbers
Chapter 105: Memory eciency
Section 105.1: Drawback of creating true private method
Appendix A: Reserved Keywords
Section A.1: Reserved Keywords
Section A.2: Identifiers & Identifier Names
Credits
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