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Explain shorthand functions in JavaScript?
The arrow functions also known as shorthand functions were introduced in ES2015 and allows us to write function in a shorter way. They don’t have their own binding to this and get the this from the surrounding context.
Following is the code showing shorthand functions in JavaScript −
Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
body {
font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}
.result {
font-size: 18px;
font-weight: 500;
color: rebeccapurple;
}
</style>
</head>
<body>
<h1>Shorthand function in JavaScript</h1>
<div class="result"></div>
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to invoke arrow and normal function</h3>
<script>
let resEle = document.querySelector(".result");
let objYear, obj1Year;
let obj = {
name: "rohan",
age: 20,
birthday() {
function birthYear() {
objYear = new Date().getFullYear() - this.age;
}
birthYear();
},
};
let obj1 = {
name: "Shawn",
age: 22,
birthday() {
let birthYear = () => {
obj1Year = new Date().getFullYear() - this.age;
};
birthYear();
},
};
document.querySelector(".Btn").addEventListener("click", () => {
obj.birthday();
obj1.birthday();
resEle.innerHTML += " Without arrow function : Birth Year = " + objYear + " ";
resEle.innerHTML += " With arrow function : Birth Year = " + obj1Year + " ";
});
</script>
</body>
</html>
Output
The above code will produce the following output −
On clicking the ‘CLICK HERE’ button −
Updated on: 2020-07-17T08:16:46+05:30
1K+ Views
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