In a previous article, , so now let's look at how to items. Arrays, which are common data structures in Javascript, look a little like this: I covered how to insert items into an array at a specific index delete let myArray = [ 'some', 'array', 'content' ]; They are a way to store data, which is commonly used throughout Javascript. If we want to delete items from an array, we can use the method that all arrays have. Let's look at how it works. splice Deleting Items from an Array If you just want to delete an item from an array, you only have to use with two arguments. The first is the index you want to start from, and the second is how many items you want to delete. For example, if we want to delete 2 items, starting at index 0 from our array, we'd do the following: splice let myArray = [ 'some', 'array', 'content' ]; myArray.splice(0, 2); // Will return [ 'content' ] console.log(myArray); As you might've noticed, actually alters the original array. So be careful when doing this, as a copy of the original will not be made! Here are some other examples to consider: splice myArray.splice(3, 1); // Removes one item, at index 3 myArray.splice(0, 5); // Removes 5 items, at index 0 (i.e. from the start of the array); Deleting Items from an Array by Value In a similar vein, we can also delete an item from an array by value, but this is a little bit more tricky. We have to use both and for this to work: indexOf splice First, we get the index of the item we want to delete by value, using . indexOf Then, we use that number to delete the array item. Here's an example. We want to delete the item from our array below. First, we get the index of that item, using . This will return , since that is the index of in our array. Then, we use that number to splice out one element at that index using . Now, is removed from our array! ravioli arr1.indexOf('ravioli') 2 ravioli splice(itemIndex, 1) ravioli let arr1 = [ 'potato', 'banana', 'ravioli', 'carrot' ]; let itemIndex = arr1.indexOf('ravioli'); // Returns [ 'potato', 'banana', 'carrot' ], since ravioli has an index of 2 arr1.splice(itemIndex, 1); console.log(arr1); Delete the last item from an Array If all you want to do is delete the last item from an array in Javascript, use . The method is an easy way to delete only the last element in an array. Just like , it mutates your original array, so a copy of your original array will not be kept: pop pop() splice let arr1 = [ 'potato', 'banana', 'ravioli', 'carrot' ]; // Returns 'carrot' console.log(arr1.pop()); // Returns [ 'potato', 'banana', 'ravioli' ] console.log(arr1); Also published . here
