How to find the index of specified string in an array?

Question

I have an array like

var x=["A|a","B|b","C|c"];

Now, i want to find the index for 'c' which is x[2]. So, we can get the index value of 'c' by running a "for" loop and splitting each string with the seperator of '|' and we can find it.

But, is there any simple way to find the value?

If all of your array elements are in that format, why split it at all? x.indexOf('C|c')? — George
– George, Commented Jul 21, 2015 at 10:44

Thom-x · Accepted Answer · 2015-07-21 10:44:13Z

2

var x=["A|a","B|b","C|c"];
var index = -1;
x.forEach(function(e, i){
  if (e.indexOf("c") !== -1) index = i;
})
alert(index);

answered Jul 21, 2015 at 10:44

Thom-x

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Comments

abs · Accepted Answer · 2015-07-21 11:05:31Z

2

You can try out something like this

Array.prototype.customIndexOf = function(str){
    var s = str.toUpperCase()+"|"+str;
    return this.indexOf(s);
};

var x=["A|a","B|b","C|c"];
x.customIndexOf('c');

One better approach

Array.prototype.customIndexOf = function(str, func){
    var s = func(str);
    return this.indexOf(s);
}

var x=["A|a","B|b","C|c"];
x.customIndexOf('c', function(arg){
    return arg.toUpperCase()+"|"+arg.toLowerCase();
});

edited Jul 21, 2015 at 11:05

answered Jul 21, 2015 at 10:46

abs

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2 Comments

David Thomas Over a year ago

I'd suggest a slight modification: var s = str.toUpperCase() + '|' + str.toLowerCase(); that way it doesn't matter whether the passed-in string is lowercase or uppercase.

abs Over a year ago

Thats grt. One better solution is we can pass a callback where user can modify his search string based on requirement. I have just updated my answer.

liuruibin · Accepted Answer · 2015-07-21 11:55:30Z

1

How about this:

for(var i in x){
if(x[i].indexOf('c') != -1)
    alert(i);
}

answered Jul 21, 2015 at 11:55

liuruibin

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1 Comment

Dan Beaulieu Over a year ago

Welcome to stack overflow, I'm reviewing your post. A few tips on how you can improve your posts and your odds of having your answer accepted / upvoted. First and foremost, make sure you explain how your solution solves the problem. Optionally, try to provide a working fiddle. Also optionally but preferred, It also helps to link to related documentation. How to answer: stackoverflow.com/help/how-to-answer

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