PHP foreach Equivalent In JavaScript

31st March 2009 - 2 minutes read time

If you are familiar with PHP you will have come across the for loop at some point. When learning JavaScript it is important to remember that it also has the ability to do the equivalent of the PHP forloop.

The following snippet shows the creation of an array of things that can't be referenced by a normal for loop due to the odd numbering of the keys.

var arrThings= new Array();
 
arrThings[3] = 'thing 1';
arrThings[42] = 'thing 2';
arrThings[47] = 'thing 3';
arrThings[32] = 'thing 4';
 
var output = '';
 
for ( var thing in arrThings ) {
 output += arrThings[thing];
}

alert(output);

The variable thing is now the iterator and will iterate through each element of the array. By using this code you no longer have to include code that thinks about the length of the array.

PHP
JavaScript

Add new comment

The content of this field is kept private and will not be shown publicly.
CAPTCHA
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.
12 + 2 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.

Related Content

Creating A Simple Pie Chart With CSS

25th December 2022

A pie chart is a great way of showing the relationship between numbers, especially when showing percentages. Drawing a pie chart from scratch takes a fair amount of maths to get working and so people usually go for third party charting libraries in order to add charts to the page.

Read more

PHP:CSI - To Switch, Or Not To Switch?

11th September 2022

I was writing unit tests for a API mapping function recently and came across this interesting issue. The code I was writing tests for was in a legacy codebase that I was making changes to, and it made sense to have some unit tests in there before I started work to ensure everything worked before and after.

Read more

Using PSR-4 With Composer

28th August 2022

The PHP Standards Recommendations (called PSR) are a set of standards that aim to make certain aspects of working with PHP easier.

Read more