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Prevent JavaScript from treating numbers as strings when using '+'

This tip describes a method for preventing JavaScript from treating numbers as strings when using '+'.

By
  • Erik Ruud
Published: 29 May 2003

Sometimes when using JavaScript for calculations, JS treats numbers as string when I use + (addition). If this happens, you can use - (subtraction) and multiply with -1 (negative 1). This forces JS to treat the number string as a number. Very useful in loops, and when getting the number string from e.g. window.document.all.elemID.innerText 


: var a=window.
document.all
var total=a(id1).innerText-
(a(id2).innerText*-1)
alert(total)

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This is a non-optimal solution as it requires more work than is needed. Prefix variables with a + to force JS to treat them as numerics. E.G
var total= +a(id1).innerText
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