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09/08/2026

05/08/2026

JavaScript Function Declarations are fully hoisted

JavaScript Function Declarations are fully hoisted. You can call the function anywhere in its scope, even before it appears in the code.
JavaScript Function Expressions (including arrow functions) hoist only their variable declaration, not the assignment. Calling them before definition results in an error.
1. Function Declaration (Fully Hoisted)
JavaScript
// Works fine! Called before definition.
greet();
function greet() {
console.log("Hello, World!");
}
2. Function Expression with var (Undefined Error)
JavaScript
// TypeError: sayHello is not a function
sayHello();
var sayHello = function() {
console.log("Hello!");
};
var sayHello is hoisted as undefined, so invoking undefined() throws a TypeError.
3. Function Expression with let / const or Arrow Function (Reference Error)
JavaScript
// ReferenceError: Cannot access 'sayHi' before initialization
sayHi();
const sayHi = () => {
console.log("Hi!");
};
let and const variables enter a Temporal Dead Zone (TDZ) until the ex*****on reaches the definition.
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05/08/2026

JavaScript Function Declarations are fully hoisted. You can call the function anywhere in its scope, even before it appears in the code.
JavaScript Function Expressions (including arrow functions) hoist only their variable declaration, not the assignment. Calling them before definition results in an error.
1. Function Declaration (Fully Hoisted)
JavaScript
// Works fine! Called before definition.
greet();
function greet() {
console.log("Hello, World!");
}
2. Function Expression with var (Undefined Error)
JavaScript
// TypeError: sayHello is not a function
sayHello();
var sayHello = function() {
console.log("Hello!");
};
var sayHello is hoisted as undefined, so invoking undefined() throws a TypeError.
3. Function Expression with let / const or Arrow Function (Reference Error)
JavaScript
// ReferenceError: Cannot access 'sayHi' before initialization
sayHi();
const sayHi = () => {
console.log("Hi!");
};
let and const variables enter a Temporal Dead Zone (TDZ) until the ex*****on reaches the definition.
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