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JavaScript Reference

Quick Reference

The Array length property sets or returns the number of elements in an array.

				
					<!-- html element to place output -->
<p id="my_cars"></p>

Getting the Length

				
					// array
let cars = ['Lamborghini', 'Ferrari', 'Maserati', 'Alfa Romeo'];

// get length
let cars_length =  cars.length;

//output constructor
document.getElementById('my_cars').innerHTML = 'Length: ' + cars_length;

Setting the Length

				
					// array
let cars = ['Lamborghini', 'Ferrari', 'Maserati', 'Alfa Romeo'];

// set length (changes the length of the existing array)
cars.length = 2;

//output constructor
document.getElementById('my_cars').innerHTML = 'Length: ' + cars_length;

Output

Getting the Length

				
					Length: 4

Setting the Length

				
					Length: 2

Syntax (getting the length)

				
					array.length

Syntax (setting the length)

				
					array.length = number

We’d like to acknowledge that we learned a great deal of our coding from W3Schools and TutorialsPoint, borrowing heavily from their teaching process and excellent code examples. We highly recommend both sites to deepen your experience, and further your coding journey. We’re just hitting the basics here at 1SMARTchicken.

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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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