CODEWITHSUNDEEP
javascript
ganesh641
ganesh641

Reputation: 25

Jquery associate two arrays (key, value) into one array with duplicate key

thanks in advance if the array is

var animals = ['Cow', 'Cow', 'Dog', 'Cat'];
var sounds = ['Moo', 'Oink', 'Woof', 'Miao'];

how can i get a assoc array like this

 // returns {'Cow': 'Moo', 'Cow': 'Oink', 'Dog': 'Woof', 'Cat': 'Miao'}

Upvotes: 0

Views: 1037

Answers (2)

Zach Leighton
Zach Leighton

Reputation: 1941

JS Fiddle of all 3 options: http://jsfiddle.net/ysLvfxmd/2/

You want a hash/associative array, loop through and create one by index, however you cannot have duplicate keys in a hash so you may want to explore other data structures.

Pure Hash

var animals = ['Cow', 'Cow', 'Dog', 'Cat'];
var sounds = ['Moo', 'Oink', 'Woof', 'Miao'];
var hash = {};

for(i = 0; i < animals.length; i++) {
    hash[animals[i]] = sounds[i];
}

console.log(hash);

This will only show Cow once, if you want to have pairs of this with non-unique keys you need to make an array of hashes

Array Of Hashes

var animals = ['Cow', 'Cow', 'Dog', 'Cat'];
var sounds = ['Moo', 'Oink', 'Woof', 'Miao'];
var arr = [];

for(i = 0; i < animals.length; i++) {
    var hash = {};
    hash[animals[i]] = sounds[i];
    arr.push(hash);
}

console.log(arr);

However, note that the indexes of the array are now numeric but you can search through it to find your values.

Third Option:

Hash Of Arrays (Best)

//Paul Rob's suggestion hash of arrays

var animals = ['Cow', 'Cow', 'Dog', 'Cat'];
var sounds = ['Moo', 'Oink', 'Woof', 'Miao'];
var hashOfArr = [];

for(i = 0; i < animals.length; i++) {
    if(!hashOfArr[animals[i]]){
        hashOfArr[animals[i]] = [];
    }
    hashOfArr[animals[i]].push(sounds[i]);
}
console.log(hashOfArr);

Upvotes: 1

Karl-Andr&#233; Gagnon
Karl-Andr&#233; Gagnon

Reputation: 33870

Short answer

What you exactly want is impossible. Objects cannot have multiple keys.

My suggestion

Have an object where the value of each key is an array. If an animal have multiple sound, you'll only have to push it into the array.

var
animals = ['Cow', 'Cow', 'Dog', 'Cat'],
sounds = ['Moo', 'Oink', 'Woof', 'Miao'],
result = {};

for(i = 0; i < animals.length; i++) {
    result[animals[i]]
        ? result[animals[i]].push(sounds[i])
        : result[animals[i]] = [sounds[i]];
}

Fiddle

Upvotes: 1

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