ES6 Number Static Methods

There has been several Number static methods added. Number.isNaN() determines whether the passed value is NaN and its type is Number. It is a more robust version of the original, global isNaN().

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Number.isInteger() determines whether the passed value is an integer.

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Number.parseInt() parses a string argument and returns an integer of the specified radix or base.

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Number.parseFloat() parses a string argument and returns a floating point number.

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