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Pseudo mandatory parameters in JavaScript
Following is the code to implement pseudo mandatory parameters in 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: 20px; font-weight: 500; color: blueviolet; } </style> </head> <body> <h1>Optional function parameters</h1> <div class="result"></div> <button class="Btn">CLICK HERE</button> <h3>Click on the above button to call the add() and multiply() function</h3> <script> let resEle = document.querySelector(".result"); function add(a = 0, b = 0) { return a + b; } function multiply(a, b) { a = a || 0; b = b || 0; return a + b; } document.querySelector(".Btn").addEventListener("click", () => { resEle.innerHTML = "Sum of the numbers = " + add() + "<br>"; resEle.innerHTML += "Multiplication of the numbers = " + multiply() + "<br>"; }); </script> </body> </html> Output
On clicking the ‘CLICK HERE’ button −
Updated on: 2020-07-17T11:43:22+05:30
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