Question

142

Reverse the logic of two or statements in JavaScript if query

rated 0 times [ 145] [ 3] / answers: 1 / hits: 9168 / 10 Years ago, wed, april 9, 2014, 12:00:00

I have an if test in JavaScript which achieves what I want but not as elegantly as possible. It goes like this:

if (x > y || p < q) {

    // don't do anything

} else {

   doSomeFunction();

}

If there any way to flip the logic of this so there's only a single if statement without having to have a dummy if-condition as well as the else condition?

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bobbidayanam

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3 Years ago

answered 10 Years ago abagail · Accepted Answer

You can use the ! operator to invert the condition:

if (!(x > y || p < q)) {

   doSomeFunction();

}

Or simply rewrite the condition like this:

if (x <= y && p >= q) {

   doSomeFunction();

}

Note: See De Morgan's laws for an explanation about why these two conditions are equivalent.