CODEWITHSUNDEEP
javascript
mezzie
mezzie

Reputation: 49

Randomize two arrays the same way, javascript

I'm using javascript and trying to sync two arrays so that both arrays have the same index location.

    var array1 = ["word1","word2","word3","word4","word5"];
    var array2 = [1,2,3,4,5];

    array2.sort(function(){ return Math.random() -.5});

This scrambles array2 into something like [2,3,1,5,4]

Now I need array1 to get the same order: ["word2", "word3", "word1", "word 5", "word4"]

How can I do this?

Upvotes: 0

Views: 651

Answers (4)

Oleg V. Volkov
Oleg V. Volkov

Reputation: 22421

You will need to link values in both arrays together. Easy way to do so is to put them in third array so pairs[index] = [ array1[index], array2[index] ]. Sort this pairs array just as you did and then split pairs back into your original arrays.

Upvotes: 0

epoch
epoch

Reputation: 16595

you will be better of using a different structure. i.e 

[{k: 1, v:'word1'}, {k: 2, v:'word2'}]

and sorting that instead

Upvotes: 2

Jani Hartikainen
Jani Hartikainen

Reputation: 43243

Something like this should be a pretty simple way to do it:

//assume array1 is like in your example and 
//array2 is the result of the randomization
var result = [];
for(var i = 0; i < array2.length; i++) {
    result[i] = array1[array2[i]];
}

Upvotes: 0

Paul
Paul

Reputation: 9022

Use associative arrays. Then shuffle the keys (eventually as a third array) and rearrange the first two array accordingly.

EDIT: Sorry, I read this as PHP and not javascript. My mistake. Maybe use objects instead of arrays.

Upvotes: 0

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