📚 The findIndex() method returns the index of the first element in the array that satisfies the provided testing function. get the index of the founded item using findIndex().To find an element into an array and move to be the first, you have to: Let me know if you know a better way to do it 💪🏻 Surely there are several way to do it, this is just one of them. log ( 'Visited index ', index, ' with value ', value ) } ) // Shows all indexes, including deletedĪrray. Declare array with no elements at indexes 2, 3, and 4 const array = // Shows all indexes, not just those with assigned valuesĬonsole. Elements that are deleted are still visited.If an existing, yet-unvisited element of the array is changed by callbackFn, its value passed to the callbackFn will be the value at the time find visits that element's index.Elements which are assigned to indexes already visited, or to indexes outside the range, will not be visited by callbackFn.callbackFn will not visit any elements added to the array after the call to find begins.If so, the elements processed by find are set before the first invocation of callbackFn. The find method does not mutate the array on which it is called, but the function provided to callbackFn can. If it is not provided, then undefined is used.

If a thisArg parameter is provided to find, it will be used as the this value inside each invocation of the callbackFn. This means it may be less efficient for sparse arrays, compared to methods that only visit assigned values. Otherwise, find returns undefined.ĬallbackFn is invoked for every index of the array, not just those with assigned values. If so, find immediately returns the value of that element. The find method executes the callbackFn function once for each index of the array until the callbackFn returns a truthy value.

Javascript find element in array