How to insert an item into an array at a specific index (JavaScript)?

Question

I am looking for a JavaScript array insert method, in the style of:

arr.insert(index, item)

Preferably in jQuery, but any JavaScript implem

Answer 1

i like little safety and i use this

   Array.prototype.Insert = function (item, before) {
        if (!item) return;
        if (before == null || before < 0 || before > this.length - 1) {
            this.push(item);
            return;
        }
        this.splice(before, 0,item );
    }
    
    
   var t = ["a","b"]
   
   t.Insert("v",1)
    
    console.log(t )