For that reason, if we want to slice a set of DOM elements we have to call the corresponding array method directly from its prototype object. All behavior is based on the expected behavior of the JavaScript API () and (). Until then, filter is really clean.Īlso note that this will remove ALL instances of the element two from the array, so make sure you don't have duplicates in your array that might unintentionally get gobbled up by this approach.A DOM collection (such as an HTMLNodeList) works much like an array but, unfortunately, doesn't have the standard JavaScript array methods. I don't think performance is as good as something like slice + concat, but worry about that if it becomes a problem (it probably won't unless you're dealing with tens-of-thousands of elements in an array). You'd want to do this so you have a non-mutated array. If a third parameter is not passed to the function, it should slice until the end of the array by default. The function should return a new array with the elements starting at the index of the first number and going until the index of the second number. `item != 'two'` returns true for everything except 'two'Ĭonst oneThree = oneTwoThree.filter(item => item != 'two')Ĭonsole.log(oneTwoThree) // - the original, unscathed, arrayĬonsole.log(oneThree) // - a copy of the original, sans the value you wanted to remove I am trying to write a function called slice that accepts an array and two numbers. Whatever returns true here is copied to a new array (the `oneThree` variable). Basically, slice lets you select a subarray from an array. `filter()` (like most array functions) iterates over every item in the array. The slice () method returns a shallow copy of a portion of an array into a new array object selected from start to end (end not included) where start and end represent the index of items in that array.
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