The final feature set of ECMAScript 2016-ES7

ECMAScript 2016 (ES2016) turns out to be a very small release. Well, ES7 (ES2016) has only two (2) features!

  1. Array.prototype.includes
  2. Exponentiation Operator

Checkout the article on Object Oriented Programming in ES2015 (es6) to learn ES6.

1. Array.prototype.includes – Array method includes

The includes() method returns a Boolean value (true or false) based on whether an array contains a specific value or not. The array method includes has the following signature:

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valueToFind

The value to search for. When comparing strings and characters, includes() is case-sensitive.

fromIndex | Optional

Optional parameter, default value is 0. This is the position in the array from where search starts. If fromIndex < 0, search starts at array.length + fromIndex .

Return Value – Boolean (true or false)

This method returns true if the value is found within the array, otherwise returns false.

Code Snippets

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2. Exponentiation Operator (x**y)

The exponentiation operator ** is an ECMAScript proposal by Rick Waldron and available in ES7. This is an infix operator for exponentiation which produces the same result as Math.pow() .

Code Snippets

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Let us look into a few more test cases

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In special cases, say you want to find the result of -4 ** 3, you may end up getting SyntaxError if you try console.log(-4 ** 3);. Let us look into the below example:

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Browser Compatibility Table

http://kangax.github.io is a perfect place to check the browser compatibility matrix for ECMAScript, including the matrix for servers/runtime, transpilers, and polyfills.

Node.js Compatibility Matrix

http://node.green is useful to check the compatibility matrix applied to only Node.js

Further reading