Use the Array constructor and fill() method to create an array with N elements in JavaScript. Call the Array() constructor with a number will create an empty elements array.
var foo = new Array(100).fill('DefaultValue');JavaScript creates an array with N elements
A simple example code creates an array containing 3 elements. All values in the Array will be the same.
<!DOCTYPE html>
<html>
<body>
<script>
const arr = Array(3).fill('A');
console.log(arr);
</script>
</body>
</html>
Output:
A very similar approach is to use the Array.from method to get an array containing N undefined values.
const arr = Array.from({length: 3}).fill('a');
console.log(arr);Fill the array with a range
function range(start, end) {
return Array(end - start + 1).fill().map((_, idx) => start + idx)
}
var result = range(9, 18); // [9, 10, 11, 12, 13, 14, 15, 16, 17, 18]
console.log(result);Do comment if you have any doubts or suggestions on this JS Array topic.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version