JavaScript Array Prototype Remove Items

Array.prototype.removeItems = function(start, end) {
    // first check to see if there is any need to do anything
    if (this.length > 0) {
        // this chops off the end into a separate var
        let remainder = this.slice((start || end) + 1 || this.length);
        // this shortens the array.. we'll add the end back in a second
        this.length = start < 0 ? this.length + start : start;
        // now we add the end back and return the new length
        return this.push.apply(this,remainder);
    } else return 0;
}

// let's create an array for testing
let myNumArray = [1,2,3,4,5,6,7];

myNumArray.removeItems(2);//from  w ww  .jav a 2s.c o m

console.log( myNumArray.toString()); // 1,2,4,5,6,7

// remove the fourth-from-last item in the array
myNumArray.removeItems(-3);

// remove the fourth-from-last to the second-from-last item
myNumArray.removeItems(-3,-1);

console.log( myNumArray.toString());