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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
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