Question

63

Is there a better way to 'do nothing' in javascript if statement?

rated 0 times [ 67] [ 4] / answers: 1 / hits: 27178 / 7 Years ago, wed, february 22, 2017, 12:00:00

My url looks like this = https://studentscafe.com/menu/2

I'm trying to check whether or not it has 2 different url params...

1.) ?dinner=1

or

2.) &dinner=1

If #1 is present, do nothing

If #2 is present, do nothing

But if neither are present, default to adding ?dinner=1 to the url.

Is there a better way to have a default do nothing in an if statement? Fiddle here for example.

var path = 'https://studentscafe.com/menu/2';



if (path.indexOf('?dinner=1') >= 1) {

    console.log('has ?');

    // do nothing leave url as it is



} else {

    console.log('does not have ?');

    if (path.indexOf('&dinner=1') >= 1) {

        // do nothing leave url as it is

    } else {

        path = path + '?dinner=1';

    }

}

Expected output: if the url doesn't have #1 or #2: https://studentscafe.com/menu/2?dinner=1

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jarrettw

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answered 7 Years ago samaraanandah · Accepted Answer

Using a regular expression and the ! negation operator, this can be rather simple:

var path = 'https://studentscafe.com/menu/2';



if (!/[?&]dinner=1/.test(path)) {

    path += '?dinner=1';

}



console.log(path);