why -1 evaluates true

Posted on August 1st, 2008 by Yousef Ourabi

Languages that do not have native boolean data-types that let you branch on non-boolean data types evaluate all non zero values as “truthy”, (-1) evaluates to true. You might be wondering, as I did, why that is?  After poking around and looking at some x86 assembly instructions, I suspect it is a compiler optimization.
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