Truncate to Decimal Places Without Round

truncate.js

// Usage
// let x = 2.1234;
// x.trunc(2);
// Result: "2.12"

// x = 2;
// x.trunc(2)
// Result: "2.00"

// @input d - decimal places to truncate
// @returns - string

Number.prototype.trunc = function(d) {
		let _temp = this.toString();
		let _split = _temp.split('.');
		let _int = _split[0];
		let _dec = _split[1] ? _split[1] : "";
		_dec = _dec.substring(0,d);
		return d > 0 ? (_int + '.' + _dec.padEnd(d,"0")) : _int;
}