Is there a splice method for strings?

Question

The Javascript splice only works with arrays. Is there similar method for strings? Or should I create my own custom function?

The substr(),

Answer 1

So, whatever adding splice method to a String prototype cant work transparent to spec...

Let's do some one extend it:

String.prototype.splice = function(...a){
    for(var r = '', p = 0, i = 1; i < a.length; i+=3)
        r+= this.slice(p, p=a[i-1]) + (a[i+1]||'') + this.slice(p+a[i], p=a[i+2]||this.length);
    return r;
}

• Every 3 args group "inserting" in splice style.
• Special if there is more then one 3 args group, the end off each cut will be the start of next.
  • '0123456789'.splice(4,1,'fourth',8,1,'eighth'); //return '0123fourth567eighth9'
• You can drop or zeroing the last arg in each group (that treated as "nothing to insert")
  • '0123456789'.splice(-4,2); //return '0123459'
• You can drop all except 1st arg in last group (that treated as "cut all after 1st arg position")
  • '0123456789'.splice(0,2,null,3,1,null,5,2,'/',8); //return '24/7'
• if You pass multiple, you MUST check the sort of the positions left-to-right order by youreself!
• And if you dont want you MUST DO NOT use it like this:
  • '0123456789'.splice(4,-3,'what?'); //return "0123what?123456789"