How do I do case-insensitive comparisons in JavaScript?

Question

I'm making a simple switch function:

var game = prompt("What game do you want to play?");

switch(game) {
    case 'League of Legends':
        console.log("You just played that!");
    //more case statements snipped... //
    break;
}

If the user puts league of legends, not League of Legends would it catch that or would it reset to the default answer at the bottom of all my cases? Furthermore, how would I change it so both answers, capitalized and not, worked?

It sounds like you're looking for a case-insensitive comparison in JavaScript. Have you looked that up at all? Maybe .toLowerCase() everything as a first cut? — George Stocker
– George Stocker, Commented Mar 5, 2014 at 3:23
Does this answer your question? Case-insensitive switch-case — Michael Freidgeim
– Michael Freidgeim, Commented Aug 15, 2021 at 12:23

tozlu · Accepted Answer · 2014-03-05 03:23:29Z

0

You can use String.toLowerCase() or String.toLocaleLowerCase()

game.toLowerCase();

answered Mar 5, 2014 at 3:23

tozlu

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Comments

plalx · Accepted Answer · 2014-03-05 03:23:42Z

0

String compare is case-sensitive, therefore you should either upper-case everything using yourString.toUpperCase() or lowercase with yourString.toLowerCase() if your code needs to be case-insensitive.

answered Mar 5, 2014 at 3:23

plalx

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Comments

Paul Roub · Accepted Answer · 2014-03-05 03:23:26Z

-1

Switch on a lower-cased version of the game:

switch (game.toLowerCase()) {
  case 'league of legends':
    console.log("You just played that!");
    break;
}

answered Mar 5, 2014 at 3:23

Paul Roub

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1 Comment

danteMingione Over a year ago

Thanks for the help. Almost everyone here knew exactly what I was talking about. I researched it but probably phrased it badly because I couldn't find exactly what I wanted. But this is exactly it thank you.

Shannon · Accepted Answer · 2014-03-05 03:24:01Z

String.toLowerCase()

In javascript the character 'L' doesn't equal the character 'l'. Therefore 'League of Legends' wouldn't match 'league of legends'. By converting the users input to all lowercase and then matching it to a lowercase string in your switch statement, you can guarantee your program won't discriminate based on case.

Your code with toLowerCase()

var game = prompt("What game do you want to play?");
game = game.toLowerCase();

switch(game) {
    case 'league of legends':
        console.log("You just played that!");
    //more case statements snipped... //
    break;
}

ydoow · Accepted Answer · 2014-03-05 03:29:56Z

-1

The string 'league of legends' and 'League of Legends' are different so that would fall to the default at the bottom of all your cases.

To make it work, you may use

switch(game.toUpperCase()) {
    case 'LEAGUE OF LEGENDS':
        console.log("You just played that!");
    //more case statements snipped... //
    break;
}

answered Mar 5, 2014 at 3:29

ydoow

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