![]() filter_function is a function or statement which should return a boolean (TRUE or FALSE) value.item is the variable name that will be assigned to each item in the array inside the filter_function.You can provide it with any criteria, and it will return an array containing only the items matching those criteria. The filter() method available on arrays provides a convenient way to do this filtering. You can write a filter to get a new array containing only the blue bad guys. In the context of JavaScript arrays, filtering means taking the original array, removing items in the array that don’t match the given criteria – and returning a copy of the original array with those items removed.įor example, you might have an array of bad guys in your game – some bad guys are red, some bad guys are blue. ![]() You might use them to store the rows in a table for calculations, or you might use them to hold references to all of the bad guys in your video game so you can quickly find them and update their status in the game. These items can be anything – numbers, strings, complex objects – whatever you want to store.Īrrays are super useful. These lists contain items at positions (called indexes). They’re one of the fundamentals of computer programming. JavaScript ArraysĪrrays are a type of variable that holds a list of other values or variables. This article will show you how to use the filter method – with easy-to-follow examples. We’ve covered arrays in JavaScript pretty extensively on LinuxScrew.
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