What is callback in Javascript?

#javascript #webdev #beginners #programming

Callback: A function passed as an argument to other function is called callback function.

function calculation(a, b, fn) {
    return fn(a, b);
}

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

function mul(a, b) {
    return a * b;
}

function sub(a, b) {
    return a - b;
}

function div(a, b) {
    return a / b;
}

console.log(calculation(4, 2, mul));

while passing function as argument to another function make sure to ignore appending parenthesis.

Thanks.

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Top comments (2)

Luke Shiru • Jul 12 '22

Just a heads up that you can add highlighting to the code blocks if you'd like. Just change:

... to specify the language:

More details in our editor guide!

About the actual post, don't forget about arrow functions, that would make your code way easier to read:

const calculation = (a, b, fn) => fn(a, b);
const add = (a, b) => a + b;
const mul = (a, b) => a * b;
const sub = (a, b) => a - b;
const div = (a, b) => a / b;

console.log(calculation(4, 2, mul));