No. of ways to empty an array in JavaScript

JavascriptWeb DevelopmentObject Oriented Programming

To empty an array in JavaScript, there are four ways −

  • Setting to new Array − In this we set our array variable to a new empty array.
  • Using length property − In this we set the length property of our array to 0.
  • Using pop − In this we continuously pop the array elements till the length reaches to 0.
  • Using splice − In this we put the start index as 0 and the no of elements to removed as array.length-1.

Following is the code to display no. of ways to empty an array in JavaScript −

Example

 Live Demo

<!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,
   .sample {
      font-size: 20px;
      font-weight: 500;
      color: blueviolet;
   }
   .sample {
      color: red;
   }
</style>
</head>
<body>
<h1>No of ways to empty an array in JavaScript</h1>
<div class="sample">
a=[1,2,3,4],b=['a','b','c'],c=['A','B','C','D'],d=[11,22,33,44]
</div>
<div class="result"></div>
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to empty the above arrays</h3>
<script>
   let resEle = document.querySelector(".result");
   let a, b, c, d;
   (a = [1, 2, 3, 4]),
   (b = ["a", "b", "c"]),
   (c = ["A", "B", "C", "D"]),
   (d = [11, 22, 33, 44]);
   document.querySelector(".Btn").addEventListener("click", () => {
      let emptyArr = [];
      a = emptyArr;
      resEle.innerHTML = " a = " + a + "<br>";
      b.length = 0;
      resEle.innerHTML += " b = " + b + "<br>";
      while (c.length > 0) {
         c.pop();
      }
      resEle.innerHTML += "c = " + c + "<br>";
      d.splice(0, d.length);
      resEle.innerHTML += "d = " + d + "<br>";
   });
</script>
</body>
</html>

Output

On clicking the ‘CLICK HERE’ button −

raja
Published on 17-Jul-2020 11:32:46
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