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Checking equivalency between one value and a range

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Jan 21.2010

I want to check whether a variable is equivalent to one of several. Basically i want to do this…

[code]if ( myColor != (‘red’ || ‘green’ || ‘blue’) ) {
alert(‘myColor is not a primary color!’);
}[/code]

is something like this possible? i know i could use a switch statement or if statements, but that seems more verbose than necessary…

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JavaScript

4 Comments(s) ↴

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@bcamp1973authorJan 21.2010 — i also realize i could do this, but it seems odd to repeat it...

if ( myColor != 'red' && myColor != 'green' && myColor != 'blue') ) {
alert('myColor is not a primary color!');
}
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@mrhooJan 21.2010 — A switch statement is the most efficient, but you can use a regular expression if you want to type less, and are not concerned with efficiency.

if(!/^(red|green|blue)$/.test(myColor))alert('myColor is not a primary');
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@bcamp1973authorJan 21.2010 — thank you!
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@rnd_meJan 21.2010 — an object is even better than a switch, and much faster than a regexp, plus you can later modify the object at runtime (adding/deleting oks), unlike a switch.

[CODE]
 var okColors={red:1, green:1, blue:1};
if ( ! okColors[myColor] ) {
alert('myColor is not a primary color!');
}[/CODE]
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