If you want to use it to iterate over an array you're going to need to keep track of an index variable too, making it really similar to a C style loop, but with the downside of leaving an index outside of the scope of the loop. The while loop is the fastest one (for some reason), it's syntax is really simple: You can use both break and continue keywords for this kind of loop too. An index modifier that runs at the end of every loop.Its syntax is inherited from the C language and it is composed of three parts:

This is one of the most used and taught arrays in Compute Science. The main difference to is the fact that you can use the break keyword to stop the loop and the continue keyword to skip the current iteration. It will avoid object properties and can be used with any object that implements the Symbol too (See advanced usage). It's really similar to the for-in loop, but the main difference between both loops is the fact that for-of is used exclusively on collection types (Maps, Sets, Arrays, TypedArrays, NodeLists, etc.). This is one of the most generous kinds of loops, it's baked in the language specification itself. It also works to loop through arrays, but if you define anything on the array prototype, then it's totally going to be iterated too. It iterates over any custom property defined on an object excluding the default javascript ones. This kind of loop usage is discouraged and reserved only for debugging sometimes, yet you might encounter it out there the wild being used in production. It's the most recommended way to iterate and it's compatible with IE9 The classic forEach array takes two arguments:ġ- A function that contains three parameters: the current item, an index, and the original array.Ģ- A this replacement to be passed to the callback function (It's ignored by arrow functions).

In this post, we're going to explore 11 different ways (In no specific order) to iterate an array (Not an object) in Javascript.Īlright, that's a pretty simple array, let's move on.ġ- Trusty old forEach Javascript, our beloved language, Its freedom can be either a blessing or a curse.

For iterator javascript