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#elisp
It is sometimes convenient to use eq for comparing an unknown value with an integer, because eq does not report an error if the unknown value is not a number—it accepts arguments of any type. By contrast, = signals an error if the arguments are not numbers or markers. However, it is better programming practice to use = if you can, even for comparing integers
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GNU Emacs Lisp Reference Manual: Comparison of Numbers
en you test whether two values are the same object. By contrast, = compares only the numeric values of the objects. In Emacs Lisp, each integer is a unique Lisp object. Therefore, eq is equivalent to = where integers are concerned. <span>It is sometimes convenient to use eq for comparing an unknown value with an integer, because eq does not report an error if the unknown value is not a number—it accepts arguments of any type. By contrast, = signals an error if the arguments are not numbers or markers. However, it is better programming practice to use = if you can, even for comparing integers. Sometimes it is useful to compare numbers with equal , which treats two numbers as equal if they have the same data type (both integers, or both floating point) and the same value.


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