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These are system functions ( not string methods) that convert strings to numbers
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parseInt("15") or equivalently parseInt("15",10) both return the number 15
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The optional second argument is radix so that parseInt("15",8) returns 17
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If input string begins with "0x" the default radix is 16 (hexadecimal) whereas if it begins with "0" the radix is 8 (octal) -- otherwise default radix is 10
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x = 1 +"1"; // evaluates to "11" whereas
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x = 1 + parseInt("1"); // evaluates to 2
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parseFloat(string) returns floating point equivalent of string
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var x = "0.0314E+2"; var y = parseFloat(x); // sets y = 3.14
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on platforms that support it, parseInt and parseFloat will return NaN (Not a Number) when argument is inappropriate
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