Explain Unexpected '1'

[cphill02]

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When converting a string like '9.59' to a number I have always used the syntax: var a = '9.59'; a = a * 1;

JSLint seems to find this method odd and destructive. I thought my method was fairly standard and straight forward. It also happens to be the fastest to execute vs any other method like parseInt or parseFloat or Math.floor

[othree]

Use a plus can easily change convert string to number.

var a = '9.59';
a = +a;

But change a variable type is not good practice. Assign the result number to another variable is much better.

And I think * 1 is a meaning less operation. The formula means nothing will change. So JSLint warns.