JS: createConditionalIntervalFunction - Creates a function that repeats its own execution repeatedly or until a condition evaluates to true. Useful for asynchronously checking some condition before running something else.

createConditionalIntervalFunction.js

var createConditionalIntervalFunction = function(condition, callback, interval, repeat = true){

	var intervalFunc = function(){

		setTimeout(function(){

			//if repeat is true, this intervalFunc will be repeated continually
			//if repeat is false, this intervalFunc will only be repeated until the condition() is true
			if(condition()){
				callback();
			}else{
				if(!repeat){
					intervalFunc();
				}
			}

			if(repeat){
				intervalFunc();
			}

		}, interval);

	};

	return intervalFunc;

};