To access the first item we use the index number: console.log(programmingLanguages) The easiest and most preferable way to create an array is with array literal notation, which you can do with square brackets with a comma separated list of elements, like the below array of strings: let programmingLanguages = This means that the first item in an array is referenced with a zero index, the second item has a one index, and the last item is the array length - 1.

An array can contain numbers, strings, another array, boolean values, and more – at the same time. This then allows them to be easily sorted or searched through.Īrrays in JavaScript can contain elements with values of different data types. It is an ordered collection of multiple items, called elements, under the same name stored together in a list.

After that, the condition is checked again and if it evaluates to true the process is repeated.

After each time the code block has been executed, there can be an action for the initialized expression that takes place at the end, like an increment statement ( i++) that updates the initial expression.

There can be more than one, on multiple lines. There are many different types of for loops in JavaScript, but the most basic ones look like this: for( initialization of expression condition action for initialized expression ), is executed. It stops repeating the action when the condition finally evaluates to false.Ī for loop in JavaScript looks very similar to a for loop in C and Java. What is a for loop? A basic syntax breakdownĪ for loop repeats an action while a specific condition is true. In addition, I'll explain how to loop through an array using a for loop, which is a fundamental programming concept. This article focuses on the for loop in the JavaScript programming language and goes over its basic syntax.

Basically, they are a fast and effective way to repeat something. Loops come in handy if you want to repeat the same block of code for a certain number of times. There are various types of loops in JavaScript, and all of them essentially do the same thing: they repeat an action again and again.

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