Compare methods for testing string's beggining character.

measures the speed of ramda's map vs Array's native map vs lodash map

Compare the new ES6 spread operator with the traditional concat() method

Compares lodash.each, Array.prototype.forEach, jQuery.each, for and for..of, when the loop body execites an inline statement.

Compares lodash.each, Array.prototype.forEach, jQuery.each, for and for..of, when the loop body calls function.

Return only objects with same id