nicolasmendonca · March 17, 2019 12:38
diff --git a/union.js b/union.js
 Array.prototype.union = ( array ) => {
 	const concatenated = this.concat( array );
 	return concatenated.filter( ( item, pos ) => concatenated.indexOf( item ) === pos );
 };

 // example
 [ 'a', 'b', 'c' ].union([ 'b', 'c', 'd', 'e' ]); // [ 'a', 'b', 'c', 'd', 'e' ]
	Array.prototype.union = ( array ) => {
	const concatenated = this.concat( array );
	return concatenated.filter( ( item, pos ) => concatenated.indexOf( item ) === pos );
	};

	// example
	[ 'a', 'b', 'c' ].union([ 'b', 'c', 'd', 'e' ]); // [ 'a', 'b', 'c', 'd', 'e' ]