mdsy

here is another implementation:
function split2(str, separator, limit) {
if (limit==0) return [str];
var a = str.split(separator, limit);
if(a.length == limit) {
let s = a.join(separator) + separator;
a.push( str.substr(s.length) );
return a;
}else{
return [str];
}
}

this way you don't have to split the entire string (in case it is huge), also shouldn't the function always return an array?

hi...
first, why do you skip the first argument and assign it to an unused variable name ???
second, the resulting pseudo-array does not behave like an array, try this:

var Wrapper = function() {
var args = Array.prototype.slice.call(arguments, 0);
this.push.apply(this, args);
return this;
}
Wrapper.prototype = Object.create(Array.prototype);
Wrapper.prototype.first = function(){ return this[0] };
var a = new Wrapper('cool',1,2,3);
a.length = 6; //OK
;a.map(function(x) {return x*2}); //OK
a.push('last one'); //OK
;a.first(); //OK
a.length = 3;
a[6]; //it is still there!!!! WRONG, should be undefined
so you see, you still haven't subclassed a Javascript Array ;-)