find index of array element in another array javascript

Question

I've 2 1-D arrays like this:

var words = ['Habitat for Humanity', 'Caring', 'Helping', 'People', 'Safety', 'Security', 'Shelter', 'Community', 'Volunteering'];
var sources = ['Helping', 'Community', 'Caring', 'Safety', 'Security'];

I want to find out the index of an element taken from the 'sources' array in the 'words' array. For example, the element 'Helping' in the 'sources' array is located at index 2 in 'words' array. So I need "2" as my solution when I search for index of the word "Helping". Can somebody help me on this? Thanks.

I tried using 'indexOf' function in arrays but id didn't work and when I searched for similar questions, it's been said that it'll not work in this problem.

Uh, words.indexOf(sources[0]) should work fine? What exactly did you try, where was said that what did not work? — Bergi
– Bergi, Commented May 8, 2015 at 2:37

Diego ZoracKy · Accepted Answer · 2015-05-08 02:45:18Z

5

Yes, indexOf will do the job. Check:

var words = ['Habitat for Humanity', 'Caring', 'Helping', 'People', 'Safety', 'Security', 'Shelter', 'Community', 'Volunteering'];
var sources = ['Helping', 'Community', 'Caring', 'Safety', 'Security'];

sources.forEach(function(source){
console.log(source, 'is at position', words.indexOf(source));
});

var words = ['Habitat for Humanity', 'Caring', 'Helping', 'People', 'Safety', 'Security', 'Shelter', 'Community', 'Volunteering'];
var sources = ['Helping', 'Community', 'Caring', 'Safety', 'Security'];

sources.forEach(function(source){
document.getElementsByTagName('div')[0].innerHTML += source + ' is at position: ' + words.indexOf(source) + '<br>';
});

<div></div>

edited May 8, 2015 at 2:45

answered May 8, 2015 at 2:39

Diego ZoracKy

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3 Comments

PRANAV DASS Over a year ago

Thanks a lot; it's working for me fine with what you've given. I'm accepting this answer and I've a small similar question in this only if you can help me with that as well. Will the above "indexOf" method work for objects as well? For example, instead of "words" array, if I've an object like nodes = {"id": 'Habitat for Humanity', "reflexive": true, "colour": "#007FFF", "radius": 70}; which stores every element of "words" array, would the same technique work on this too?

Diego ZoracKy Over a year ago

No, it will not. Take a look at this plugin (i'm the author, by the way), maybe you will find useful in some way to query Object's data: github.com/DiegoZoracKy/data-query

Diego ZoracKy Over a year ago

@PRANAVDASS If you need an example of code for doing that with a JSON and this plugin, create a new question or edit this one, so we can have a proper answer for that. Code formatting will help

Amadan · Accepted Answer · 2015-05-08 02:31:10Z

3

sources.map(function(word) { return words.indexOf(word); })
// => [2, 7, 1, 4, 5]

answered May 8, 2015 at 2:31

Amadan

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Comments

Flo · Accepted Answer · 2015-05-08 02:35:52Z

1

You can use an each function.

$.each(words, function(key, value) {
      if(value == 'Helping'){
          alert(key);
      }
});

answered May 8, 2015 at 2:35

Flo

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1 Comment

Flo Over a year ago

first think that came to mind... using this you can also get the value for more than just one value at a time.

CreativeDifference · Accepted Answer · 2022-05-31 03:48:46Z

0

var searchArray=function(value,words){
    var result=-1;
    for(var i=0;i<words.length;i++){
        if(words[i]==value){
            result=I;
            break
        }
    return result;
}

Answered From mobile. Feel free to format.

edited May 31, 2022 at 3:48

CreativeDifference

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answered May 8, 2015 at 2:39

Sunil B N

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5 Comments

Bergi Over a year ago

Is there a difference to what indexOf does?

Sunil B N Over a year ago

Nothing. Its just that it's available from JavaScript version 1.6

Bergi Over a year ago

Oh right, and that is available everywhere since when? 10 years ago?

Sunil B N Over a year ago

indexOf also takes second input as from where to start searching

Sunil B N Over a year ago

@Bergi just little bit less than 10 years :)

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