JavaScript: Empty an array keeping the original
JavaScript Array: Exercise-33 with Solution
Write a JavaScript script to empty an array keeping the original.
Sample Solution:
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JavaScript script to empty an array keeping the original.</title>
</head>
<body>
</body>
</html>
JavaScript Code:
var arr = [1, 3, 6, 3, -5];
console.log(arr);
arr.length = 0;
console.log(arr);
Sample Output:
[1,3,6,3,-5] []
ES6 Version:
var arr = [1, 3, 6, 3, -5];
console.log(arr);
arr.length = 0;
console.log(arr);
Live Demo:
See the Pen JavaScript - Empty an array keeping the original - array-ex- 33 by w3resource (@w3resource) on CodePen.
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JavaScript: Tips of the Day
How to insert an item into an array at a specific index (JavaScript)?
What you want is the splice function on the native array object.
arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:
var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());
Ref: https://bit.ly/2BXbp04
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