JavaScript
- Getting started with JavaScript
- Awesome Book
- Awesome Community
- Awesome Course
- Awesome Tutorial
- Awesome YouTube
- .postMessage() and MessageEvent
- AJAX
- Anti-patterns
- Arithmetic (Math)
- Arrays
- Arrow Functions
- Async functions (async/await)
- Async Iterators
- Automatic Semicolon Insertion - ASI
- Battery Status API
- Behavioral Design Patterns
- Binary Data
- Bitwise operators
- Bitwise Operators - Real World Examples (snippets)
- BOM (Browser Object Model)
- Built-in Constants
- Callbacks
- Classes
- Comments
- Comparison Operations
- Conditions
- Console
- Constructor functions
- Context (this)
- Cookies
- Creational Design Patterns
- Custom Elements
- Data attributes
- Data Manipulation
- Datatypes in Javascript
- Date
- Date Comparison
- Debugging
- Declarations and Assignments
- Destructuring assignment
- Detecting browser
- Enumerations
- Error Handling
- Escape Sequences
- Evaluating JavaScript
- Events
- execCommand and contenteditable
- Fetch
- File API, Blobs and FileReaders
- Fluent API
- Functional JavaScript
- Functions
- Generators
- Geolocation
- Global error handling in browsers
- History
- How to make iterator usable inside async callback function
- IndexedDB
- Inheritance
- Intervals and Timeouts
- JavaScript Variables
- JSON
- Linters - Ensuring code quality
- Localization
- Loops
- Map
- Memory efficiency
- Method Chaining
- Modals - Prompts
- Modularization Techniques
- Modules
- Namespacing
- Navigator Object
- Notifications API
- Objects
- Performance Tips
- Promises
- Prototypes, objects
- Proxy
- Regular expressions
- requestAnimationFrame
- Reserved Keywords
- Same Origin Policy & Cross-Origin Communication
- Scope
- Screen
- Security issues
- Selection API
- Server-sent events
- Set
- Setters and Getters
- Strict mode
- Strings
- Symbols
- Tail Call Optimization
- Template Literals
- The Event Loop
- Tilde ~
- Timestamps
- Transpiling
- Unary Operators
- Unit Testing Javascript
- Using javascript to get/set CSS custom variables
- Variable coercion/conversion
- Array to String using array methods
- Convert an array to a string
- Convert string to float
- Converting a number to a boolean
- Converting a number to a string
- Converting a string to a boolean
- Converting a string to a number
- Converting to boolean
- Double Negation (!!x)
- Float to Integer
- Implicit conversion
- Integer to Float
- Primitive to Primitive conversion table
- Vibration API
- WeakMap
- WeakSet
- Web Cryptography API
- Web Storage
- WebSockets
- Workers
JavaScript Variable coercion/conversion Converting a string to a number
Example
Number('0') === 0
Number('0') will convert the string ('0') into a number (0)
A shorter, but less clear, form:
+'0' === 0
The unary + operator does nothing to numbers, but converts anything else to a number.
Interestingly, +(-12) === -12.
parseInt('0', 10) === 0
parseInt('0', 10) will convert the string ('0') into a number (0), don't forget the second argument, which is radix. If not given, parseInt could convert string to wrong number.
