how to create callback function code example

Example 1: callback function

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

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

processUserInput(greeting);

Example 2: javascript callback function

const message = function() {  
    console.log("This message is shown after 3 seconds");
}
 
setTimeout(message, 3000);

Example 3: callback function

const ironMan = withGloves(withBoots(withArmor(withHelmet(TonyStark))));

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Javascript Example

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