Ever needed to arrange an Array of Structs in a specific order which wasn't alphabetical or numerical? (e.g. Federal Holidays, or Beatles) This function can help you with that.

arrangeArrayStructs.js

function arrangeArrayStructs(arrayToArrange, arrOrder, whichKey){
	var results = [];
	
	arrOrder.forEach( function(item){
		results.push( arrayToArrange.filter( record => record[whichKey] == item ) );
	});

	return results;	
}

Given this:

var Beatles = [ {"firstName":"John","lastName":"Lennon"}, {"firstName":"Paul","lastName":"McCartney"}, {"firstName":"George","lastName":"Harrison"}, {"firstName":"Ringo","lastName":"Starr"} ];

Doing this:

arrangeArrayStructs(Beatles,["Ringo","George","Paul","John"], "firstName");

Will return this:

0: {firstName: "Ringo", lastName: "Starr"} 1: {firstName: "George", lastName: "Harrison"} 2: {firstName: "Paul", lastName: "McCartney"} 3: {firstName: "John", lastName: "Lennon"}

Some caveats:

• requires ES6 for the arrow feature, so no Internet Explorer 11 (sorry, not sorry)
• second function parameter must be an array, to deal with possibility of names with commas (e.g. "MLK, Jr. Birthday")
• the values of the key specified in whichKey parameter must be unique (i.e. if there were two Paul's we'd be screwed)
• does not modify the original array