Javascript: Converting String to Number?

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For integers, try str = parseInt( str, 10 ).

(note: the second parameter signifies the radix for parsing; in this case, your number will be parsed as a decimal)

parseFloat can be used for floating point numbers. Unary + is a third option: str = +str.

That being said, however, the term “type” is used quite loosely in JavaScript.
Could you explain why are you concerned with variable’s type at all?

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