Javascript ES5 helper functions

helper.js

function getAllPropertyNames (obj){
  var result = [];
  while (obj) {
    Array.prototype.push.apply(result, Object.getOwnPropertyNames(obj));
    obj = Object.getPrototypeOf(obj);
  }
  return result;
}

function getDefiningObject (obj, propKey) {
    obj = Object(obj);
    while(obj && !{}.hasOwnProperty.call(obj, propKey)) {
        obj = Object.getPrototypeOf(obj);
    }
    return obj;
}

function randomInteger(min, max) {
    return Math.floor(Math.random() * (max-min+1)) + min;
}

function toDigits(value, digits) { // Rounds a number to given precision. Doesn't remove float precision problems
	return Number(value.toFixed(digits));
}

function inSteps(value, step) { 
	return Math.round(value/step);
}

function roundToStep(value, step, decimals) { 
	value = inSteps(value, step) * step;
	return toDigits(value, decimals);
}

function randomStep(min, max, step, digits) {
	min = toDigits(min, digits);
	max = toDigits(max, digits);
	step = toDigits(step, digits);
	var steps = inSteps(max-min, step); 
	var randStepNumber = randomInteger(0, steps);
	var rand = min + randStepNumber*step;
	return toDigits(rand, digits);
}

function quotient(num,divisor) {
	return num/divisor>>0;
}

function isFiniteNumber (val) {
	return typeof val==='number' && isFinite(val);
}