- Categories: JavaScript Methods, JavaScript Reference, Reference
Quick Reference
The Array fill() method fills specified elements in an array with a value, overwriting the original array. If the start and end positions are NOT specified, ALL elements will be filled.
<!-- html element to place output -->
<p id="my_cars"></p>
// array
let cars = ['Lamborghini', 'Ferrari', 'Maserati', 'Alfa Romeo'];
// fills item 1 and 2 with Lotus
document.getElementById('my_cars').innerHTML = cars.fill('Lotus',1,3);
The way this works (see Syntax section below):
- The fill() method looks within the array and starting with item 1 and ending before item 3, replaces the values with Lotus
Output
Lamborghini,Lotus,Lotus,Alfa Romeo,Astin Martin,Porsche
Syntax
array.fill(value, start, end)
Parameters
| Parameter | Description |
|---|---|
| value | The value to fill in (required) |
| start | The start position (default is 0) |
| end | The stop position (default is the array length) |
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JAVASCRIPT NOTES:
- When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- JavaScript is a case-sensitive language; firstName is NOT the same as firstname
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
- JavaScript variables must begin with a letter, $, or _
- JavaScript variables are case sensitive (x is not the same as X)
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