- Categories: JavaScript Methods, JavaScript Reference, Reference
Quick Reference
The Array concat() method joins two or more arrays, returning a new array containing the joined arrays, without changing the existing arrays.
<!-- html element to place output -->
<p id="my_cars"></p>
// existing arrays
let cars_1 = ['Lamborghini', 'Ferrari'];
let cars_2 = ['Maserati', 'Alfa Romeo'];
// concat arrays
let cars_3 = cars_1.concat(cars_2);
//output new array content
document.getElementById('my_cars').innerHTML = cars_3;
Output
Lamborghini,Ferrari,Maserati,Alfa Romeo
Syntax
array1.concat(array2, array3, ..., etc.)
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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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