Functions – declarations, expressions & arrow functions

Function Declaration:

function add(a,b){ return a+b; }

Function Expression:

const multiply = function(a,b){ return a*b; };

Arrow Function (ES6):

const divide = (a,b) => a / b;

Key differences:

• Arrow functions lexically bind this.
• No arguments object – use rest parameters (...args).
• Cannot be used as constructors.

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Example: Arrow function preserving this

const obj = {
  value: 42,
  getValue: () => this.value   // `this` refers to the surrounding scope (window), NOT obj!
};