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Alternatively, you can use the Array.map() method. Looking at the console log it seems like the length of repeatLater is one plus the number of objects which is odd, the addition being proto. If the function we passed to the findIndex() method never returns a truthy value, the method returns -1. I suspect that the problem might be because there are objects/entries in the repeatLater array that do not have the ‘minTrial’ key. Occasionally I get thrown this error : TypeError: Cannot read property ‘minTrial’ of undefined Searches for an element that matches the conditions defined by the specified predicate, and returns the zero-based index of the first occurrence within the. repeatIdx = repeatLater.findIndex( x => x.minTrial <= trials.thisN )

Syntax: array.find (function (currentValue, index, arr),thisValue) Example 1: This example uses the find () method to search the element. It finds the element in the DOM tree by traversing through the root to the leaf. After retrieving the trial, I delete that object from the array. JavaScript find () method: The find () method is used to find all the descendant elements of the selected element. repeatLater.push() Īt the beginning of the routine, I am using findIndex to search through repeatLater to find the index of the first instance where the my specifications are met, in this case I want the trial number to be at least the minTrial. I created an array of objects (named repeatLater) where each object consists of specifications of a that I’d want to repeat after a number of trials. The findIndex () method does not execute the function for empty array elements. The findIndex () method returns -1 if no match is found. The findIndex () method returns the index (position) of the first element that passes a test. And then have your findIndex look for the correct record based on the id: const bookmarkId .value const objIndex bookMarksArray.findIndex (obj > obj. If the item is a primitive value, like a string or number, you can use the indexOf method of an array: const letters = const index = letters.Hi all, This is more of a javascript question. The findIndex () method executes a function for each array element. Suppose you have the value of an item which is contained in an array, and you want to get its index. Here is how to retrieve the index of an item in a JS array based on its value