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How to convert a string to a number using JavaScript?



You can use the parseInt() and parseFloat() methods. Notice that extra letters following a valid number are ignored, which is kinda wierd but convenient at times.
parseInt(“100″) ==> 100
parseFloat(“98.6″) ==> 98.6
parseFloat(“98.6 is a common temperature.”) ==> 98.6
parseInt(“aa”) ==> Nan //Not a Number
parseInt(“aa”,16) ==> 170 //you can supply a radix or base

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