JavaScript
- Getting started with JavaScript
- Awesome Book
- Awesome Community
- Awesome Course
- Awesome Tutorial
- Awesome YouTube
- .postMessage() and MessageEvent
- AJAX
- Anti-patterns
- Arithmetic (Math)
- Addition (+)
- Bitwise operators
- Ceiling and Floor
- Constants
- Decrementing (--)
- Division (/)
- Exponentiation (Math.pow() or **)
- Get Random Between Two Numbers
- Getting maximum and minimum
- Getting roots of a number
- Incrementing (++)
- Little / Big endian for typed arrays when using bitwise operators
- Math.atan2 to find direction
- Math.hypot
- Multiplication (*)
- Periodic functions using Math.sin
- Random with gaussian distribution
- Random Integers and Floats
- Remainder / Modulus (%)
- Restrict Number to Min/Max Range
- Rounding
- Simulating events with different probabilities
- Sin & Cos to create a vector given direction & distance
- Subtraction (-)
- Trigonometry
- 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
- Vibration API
- WeakMap
- WeakSet
- Web Cryptography API
- Web Storage
- WebSockets
- Workers
JavaScript Arithmetic (Math) Subtraction (-)
Example
The subtraction operator (-) subtracts numbers.
var a = 9;
var b = 3;
var c = a - b;
c will now be 6
If a string or boolean is provided in place of a number value, it gets converted to a number before the difference is calculated (0 for false, 1 for true):
"5" - 1; // 4
7 - "3"; // 4
"5" - true; // 4
If the string value cannot be converted into a Number, the result will be NaN:
"foo" - 1; // NaN
100 - "bar"; // NaN
