Floor and Ceil to a certain digit. Javascript Function.

simpleNum.js

/*

let floored = floorNum(1430); //1000
let floored2 = floorNum(1430, 2); //1400
let ceiled = ceilNum(1430); //2000
let ceiled3 = ceilNum(1543, 3); //1550

*/

function floorNum(num, ind){
	ind = ind || 1;
	let str = Math.floor(num)+"",
			strL = str.length - (ind - 1),
			arr = new Array(strL).fill("0");
	arr[0] = "1";
	let div = arr.join("");
  
	return Math.floor(num/div)*div;
}

function ceilNum(num, ind){
	ind = ind || 1;
	let str = Math.floor(num)+"",
			strL = str.length - (ind - 1),
			arr = new Array(strL).fill("0");
	arr[0] = "1";
	let div = arr.join("");

	return Math.ceil(num/div)*div;
}