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How to create a zero-filled JavaScript array?

Javascript Web Development Front End Technology

To create a zero-filled JavaScript array, you have several methods available. The most common approaches include using Array.fill(), Array.from(), or typed arrays like Uint8Array.

Using Array.fill() Method

The Array.fill() method is the most straightforward way to create a zero-filled array:

<html>
   <body>
      <script>
         // Create array of length 5 filled with zeros
         var zeroArray = new Array(5).fill(0);
         document.write("Zero-filled array: " + zeroArray);
         
         // Alternative syntax
         var anotherArray = Array(3).fill(0);
         document.write("<br>Another zero array: " + anotherArray);
      </script>
   </body>
</html>

Zero-filled array: 0,0,0,0,0
Another zero array: 0,0,0

Using Array.from() Method

The Array.from() method provides more flexibility for creating arrays:

<html>
   <body>
      <script>
         // Create zero-filled array using Array.from()
         var zeroArray = Array.from({length: 4}, () => 0);
         document.write("Array.from() result: " + zeroArray);
         
         // Using Array.from() with fill method
         var simpleZeros = Array.from(Array(3), () => 0);
         document.write("<br>Simple zeros: " + simpleZeros);
      </script>
   </body>
</html>

Array.from() result: 0,0,0,0
Simple zeros: 0,0,0

Using Typed Arrays

Typed arrays like Uint8Array automatically initialize with zeros:

<html>
   <body>
      <script>
         var normalArray = ["marketing", "technical", "finance", "sales"];
         var zeroFilledArray = new Uint8Array(4);
         
         document.write("Normal array: " + normalArray);
         document.write("<br>Zero filled array: " + zeroFilledArray);
         document.write("<br>Array length: " + zeroFilledArray.length);
      </script>
   </body>
</html>

Normal array: marketing,technical,finance,sales
Zero filled array: 0,0,0,0
Array length: 4

Comparison of Methods

Method	Syntax	Performance	Use Case
`Array.fill()`	`new Array(n).fill(0)`	Good	General purpose
`Array.from()`	`Array.from({length: n}, () => 0)`	Good	More flexible
`Uint8Array`	`new Uint8Array(n)`	Best	Numeric data only

Conclusion

Use Array.fill(0) for most cases as it's readable and flexible. Choose Uint8Array for performance-critical numeric operations where you need guaranteed zero initialization.

Ramu Prasad

Updated on: 2026-03-15T23:18:59+05:30

204 Views

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