ESCMAScript 6 arrow functions – parentheses around parameter

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The parenthesis around input arguments (x in this case) are only required when there are two or more input arguments. With just one (as you’ve shown here), the two statements are identical.

(x) => { return x * 2; } is the same as x => { return x * 2; }

But,

(x, y) => { return x * y; }

Requires parenthesis around the input arguments.

See this for all the gory details!

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