Js splice return value8/30/2023 ![]() The method result.includes(str) internally walks the array result and compares each element against str to find the match. The code works, but there’s a potential performance problem in it. "Krishna", "Krishna", "Hare", "Hare", ":-O"Īlert( unique(strings) ) // Hare, Krishna, :-O Let strings = ["Hare", "Krishna", "Hare", "Krishna", Soon you’ll automatically remember the methods, without specific efforts from your side. Examples will help you to write it correctly. Then solve the tasks of this chapter to practice, so that you have experience with array methods.Īfterwards whenever you need to do something with an array, and you don’t know how – come here, look at the cheat sheet and find the right method. Look through the cheat sheet just to be aware of them. Return arr1.length = arr2.length & arr1.every((value, index) => value = arr2) Īlert( arraysEqual(, )) // trueĪrr.fill(value, start, end) – fills the array with repeating value from index start to end.Īrr.copyWithin(target, start, end) – copies its elements from position start till position end into itself, at position target (overwrites existing).Īrr.flat(depth)/ arr.flatMap(fn) create a new flat array from a multidimensional array.įrom the first sight it may seem that there are so many methods, quite difficult to remember. These methods behave sort of like || and & operators: if fn returns a truthy value, arr.some() immediately returns true and stops iterating over the rest of items if fn returns a falsy value, arr.every() immediately returns false and stops iterating over the rest of items as well. If any/all results are true, returns true, otherwise false. The function fn is called on each element of the array similar to map. But there are few others:Īrr.some(fn)/ arr.every(fn) check the array. ![]() These methods are the most used ones, they cover 99% of use cases. Please note that methods sort, reverse and splice modify the array itself. ![]()
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