Jan 29, 2019 · Alternative to array.splice in JavaScript. 1. splice() inside a for loop, what is the solution? 3.

Dec 14, 2011 · Array.prototype.splice() populates the original array and after performing the chunk() the original array (arr) becomes []. So if you want to keep the original array untouched, then copy and keep the arr data into another array and do the same thing.

Aug 22, 2012 · You want to use slice() and not splice() ! ArrayB = ArrayA.slice(0); slice() leaves the original array untouched and just creates a copy. splice() on the other hand just modifies the original array by inserting or deleting elements.

Aug 5, 2021 · So the splice method would return a new array (as it returns a new array of the removed elements) containing only 5. To get back an array containing all the elements except the last element 5 you should write : arr = arr.splice(0,4) which means that start from index 0 and remove elements till index 4.

I have this code which is supposed to iterate over each item in an array, removing items based on some condition: //iterate over all items in an array //if the item is "b", remove it. var arra...

Mozilla Dev Center - Array.splice states that the second parameter is 'howMany' elements to remove. I'm not sure how your code worked when it passed in the indexValue as the number of elements to remove, unless you were removing from the end of the array.

Changes the content of an array, adding new elements while removing old elements. The original array gets changed, rather than returning a new array with the specified elements removed. MyArray.splice(i, 1); should be enough.

Sep 22, 2011 · The array.splice function splices an array returns the elements that were removed. Since you are not removing anything and just using it to insert an element, it will return the empty array. I think this is what you are wanting. var a = [1,2,3,4,5]; a.splice(1, 0, 'foo'); var b …

Jan 29, 2019 · Actually, it's entirely dependent on the length of the array. If you change to a 100,000 element array, then splicing a value into the middle is 95% slower than adding a value on the end, as measured by your jsperf test. That's because inserting in the middle is O(n) in the size of the array, while inserting at the end can be O(1). –

Jul 21, 2013 · 1) cache["r"] = "r"; does not add an element to your array, it adds a property to the cache object To initialize an array you can use some thing like