spread vs concat vs unshift vs push+sort

Test performance of different ways of get just one particular DOM element - using each method's strengths, instead of biasing towards getElementById.

Compares slice, substr and substring to each other when there is only a start index

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We are testing String.split with a string input against String.match with a regex input, both will output an array.

Test String.match with regex against String.split with string. We are splitting a string at the spaces.

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