Pure and Impure Functions in JavaScript.

 

JavaScript Pure and Impure Functions.

1. JavaScript Pure Functions.

    JavaScript Pure Function Without modifying value return. like predictable out value.

function add(x) {

    return x + 1;

}

console.log(add(10)); // output : 11

console.log(add(11)); // output : 12

console.log(add(12)); // output : 13

2. JavaScript Impure Functions. 

    JavaScript Impure Function value is change every time.

let x = 10;

function add() {

    return x++;

}

console.log(add()); // output : 10

console.log(add()); // output : 11

console.log(add()); // output : 12