![]() If the string does not start with a number, Output will be NaN (Not a Number): parseInt ( "I'm 10", 10 ) // Output => NaN ParseInt() can parse a string that does not only contain a number: parseInt ( '10 lions', 10 ) // Ouput => 10 The second parameter is the radix, always 10 for decimal numbers, if missed the conversion might try to guess the radix and give unexpected results. Use PARSEINT() Or PARSEFLOAT() : const count = parseInt ( '1234', 10 ) // Ouput => 1234 In case if string with decimal seperator needs to be parsed then Intl.NumberFormat should be used.Ģ. Number Object (without the "new" keyword) : const count = Number ( '1234' ) // Output => 1234 JavaScript provides many ways to convert a string value into a number.ġ.
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