The most basic way to JavaScript initialize an array with 0 is to hardcode each value. The below code will initialize an array of length 7 filled with zeros.
var array = [0,0,0,0,0,0,0]To initialize an array with zeros in JavaScript, you can use the Array() constructor along with the fill() method. Here’s an example:
const length = 5; // specify the length of the array
const array = Array(length).fill(0);
console.log(array);
Note: This method is efficient but it’s not practical if the array is very large
JavaScript initializes an array with a 0
Simple example code using Loops. First initializes an array of length 7 then uses for-loop to set each element of the array to 0. Or you can also push 7 zeros into an empty array.
<!DOCTYPE html>
<html>
<body>
<script>
var arr1 = new Array(7);
for(var i=0; i<arr1.length; ++i)
arr1[i] = 0
console.log(arr1)
var arr2 = []
for(var i=0; i<7; ++i)
arr2.push(0)
console.log(arr2)
</script>
</body>
</html>
Output:
Using fill()
var array = new Array(7).fill(0); for(var i=0;i<array.length;++i) console.log(array[i])
- Array.fill() fills an array with a specified static value.
- Array.fill(0) will fill the array with 0.
This method overwrites the actual array.
Alternatively, you can use the Array.from() method to achieve the same result:
const length = 5;
const array = Array.from({ length }, () => 0);
console.log(array);
Using split() and join()
var array = new Array(8).join('0').split('');
for(var i=0;i<array.length;++i)
console.log(array[i])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