4/22/2023 0 Comments Array find js![]() Lets have a look: const needle = 8 Ĭonst closest =. ![]() () use to determine if an element exists in an array - it returns a boolean (true / false) value if the element exists. This page provides examples of query operations on array fields using the db.collection.find() method in mongosh. If the element exists in the array then it is returned. ![]() Reduce will run a callback function on each element in an array and then return the result of the last callback invocation. () use when you want to get the actual element you are looking for in the array. Second we need a function to compare each value of an array and return the closest to our ‘needle’. ![]() The easiest way to do this is to use Math.abs(), so lets use that. So how do you find the closest value in an array using reduce()?įirst we need to know how to get the difference between 2 numbers in JavaScript. In the end I decided to use reduce() mainly because it was my initial instinct, but also because it isn’t every day that you find an actual ‘use for reduce()’! Find the closest value in array using reduce() This funny little problem seems to be a bit polarising because there are a few solutions you could roll with. However, theres another method, which is more efficient than the for loop or the forEach() method, it is the JavaScript array filter() method. This meant that I had to find the closest number in an array to where my drag ended and animate a snap to that position. Today I was making a ‘draggy’, ‘slidey’, web component, control, ‘thing’ which needed to snap to pre-determined positions when the drag ended. The find method invokes the function for every array element automatically, until a truthy value is returned. Facebook Share Twitter Share LinkedIn Share
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