Callback Function

Hi guys,

Today we are going to discuss the Callback function.

Callback is the one of the weird concept if you people are coming from the C programming language.

Callback is nothing but a function which is passed as an parameter to the other function and being used inside that(the function where it is passed as an parameter.) function

Example

function greeting(name) {
alert('Hello ' + name);
}

function processUserInput(callback) {
var name = prompt('Please enter your name.');
callback(name);
}

processUserInput(greeting);

Example Source

Snippet Explanation :

• First the proceessUserInput method executes which takes greeting function as an parameter, Where the first line of the method asks as to type the name.

• Second line where the greeting(callback) function calls which the function inside the other function.

• It takes name output from the processUserInput and alerts the greeting message.

OUTPUT

Please enter your name. John

Hello John

That's it

Thanks! for reading

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