Original link:Array: Insert an Item at a Specific Index with JavaScript
Original date: July 24, 2014
Translation date: July 26, 2014
Translator:Iron anchor
Many array-related tasks sound simple, but they are not always the case, and developers often don't use it. Recently I encountered a requirement: insert an element into a specific index of an existing array. It sounds easy and common, but it takes a little time to study it.
If you are not disgusted with extending native JavaScript, you can add this method to the Array prototype:
At this time, you can call it like this:
I've made some other modifications to the array, maybe you've seen it:
Original date: July 24, 2014
Translation date: July 26, 2014
Translator:Iron anchor
Many array-related tasks sound simple, but they are not always the case, and developers often don't use it. Recently I encountered a requirement: insert an element into a specific index of an existing array. It sounds easy and common, but it takes a little time to study it.
// The original array
var array = ["one", "two", "four"];
// splice(position, numberOfItemsToRemove, item)
//Sticking function (index position, number of elements to be deleted, element)
(2, 0, "three");
array; // Now the array looks like this ["one", "two", "three", "four"]If you are not disgusted with extending native JavaScript, you can add this method to the Array prototype:
= function (index, item) {
(index, 0, item);
};At this time, you can call it like this:
var nums = ["one", "two", "four"];
(2, 'three'); // Pay attention to array index, [0,1,2..]
array // ["one", "two", "three", "four"]I've made some other modifications to the array, maybe you've seen it:
- Remove an Item From an Array: Remove elements from array
- Clone Arrays: Array cloning
- Empty Arrays: Empty array
- Sort Arrays: Array sorting