How can I use array variable in an if statement?

Question

var n = new Array();
n[0] = "zero";
n[1] = "first";
n[2] = "second"

function myFunction() {
    var x = prompt("Question?")
    if (x.toLowerCase() == n) {
        //code
    } else {
        //code
    }
}

Is it possible to make it so that if any of the array variables are typed in, the if / else function is still carried out.

It's not clear what you're trying to do. What are you trying to do? You can't compare a string to an array like that. — Vivin Paliath
– Vivin Paliath, Commented Mar 19, 2013 at 21:58
sorry. really struggling to phrase things here. basically, if anyone types in the array values ("zero", "first"...), can the if or else statements be carried out. if (x..==n) just makes it so that when the letter "n" is typed into the prompt box the statements are carried out. — user2166577
– user2166577, Commented Mar 19, 2013 at 22:01
@LiamB Actually, x.toLowerCase() == n will not be true when the letter n is typed into the input box. n is an array of the strings "zero", "first", "second", and is not equal to the string "n". Just to recap, n is an array, x.toLowerCase() is a string that contains the lowercased input. You are checking whether a string equals an array, which is false. — user1726343
– user1726343, Commented Mar 19, 2013 at 22:03

bfavaretto · Accepted Answer · 2013-03-19 22:33:37Z

3

I'm guessing you want to check if the typed value exists in the array? If so:

function myFunction() {
    var x = prompt("Question?")
    if (n.indexOf(x.toLowerCase()) > -1) {
        //code
    } else {
        //code
    }
}

You you need to support IE8 and earlier, you'll need a shim for Array.prototype.indexOf (for example, the one provided by MDN).

edited Mar 19, 2013 at 22:33

answered Mar 19, 2013 at 21:58

bfavaretto

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4 Comments

user1726343 Over a year ago

+1, You're on a roll today. I can barely get a word in edgewise.

NoodleFolk Over a year ago

The indexOf() method is not supported in Internet Explorer 8 and earlier. Consider looping through the array or use one from a js library

user2166577 Over a year ago

thanks. the code works and you managed to understand my poorly phrased question. +1

bfavaretto Over a year ago

@sshen That's true, added a link to an example shim.

Philipp · Accepted Answer · 2013-03-19 21:57:30Z

0

Depending on if you want the condition to be true on every array element or just on at least one, you can use n.every or n.some.

answered Mar 19, 2013 at 21:57

Philipp

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Comments

The Internet · Accepted Answer · 2013-03-19 21:58:05Z

0

var n = new Array();
n[0] = "zero";
n[1] = "first";
n[2] = "second"

function myFunction()
{
var x=prompt("Question?")
    for (var i in n) {
        if (x.toLowerCase() === n[i] ){ alert("true"); }  
    }
}

myFunction();

answered Mar 19, 2013 at 21:58

The Internet

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