- Categories: JavaScript Methods, JavaScript Reference, Reference
Quick Reference
The Array copyWithin() method copies array elements to another position in an array, overwriting the existing values.
The copyWithin() methods DOES NOT add items to the array.
<!-- html element to place output -->
<p id="my_cars"></p>
// array
let cars = ['Lamborghini', 'Ferrari', 'Maserati', 'Alfa Romeo', 'Astin Martin', 'Porsche'];
// copyWithin and place in html
document.getElementById('my_cars').innerHTML = cars.copyWithin(2,0,3);
The way this works (see Syntax section below):
- Target – place and overwrite starting at position 2 (Maserati) overwriting 3 items (Maserati, Alfa Romeo, Astin Martin)
- Start – copy start with item 0 (Lamborghini)
- End – copy 3 items starting with item 0 (Lamborghini, Ferrari, Maserati)
Output
Lamborghini,Ferrari,Lamborghini,Ferrari,Maserati,Porsche
Syntax
array.copyWithin(target, start, end)
Parameters
| Parameter | Description |
|---|---|
| target | The position to copy the elements to (required) |
| start | The start position (default is 0) |
| end | The end 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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