如何在JavaScript中的多维数组中获取数组的键和值

Question

I Have a multidimensional array such as

MultArrary = [
['a','b'],
['c','d'],
['f','g']
]

What i need is to get the key and value of each array inside the array and push it into another array

Expected array1 = ['a','c','f'];
expected array2 = ['b','d','g'];

Any ideas how to achieve this with javascript or rxjs will be great

Answer 1

Easiest thing to do (while not syntatically correct, see the comments below your question) in your case is to use a Map (provided you are within an ecmascript6 capable environment):

  var MultiArray = [ ['a', 'b'], ['c', 'd'], ['f', 'g'] ]; var m = new Map(MultiArray); var index0 = Array.from(m.keys()); var index1 = Array.from(m.values()); console.log(index0, index1); 

Answer 2

Using Underscore.js you can do it with unzip :

 var MultArrary = [ ['a', 'b'], ['c', 'd'], ['f', 'g'] ]; var rst = _.unzip(MultArrary); //[['a','c','f'],['b','d','g']] console.log(rst); 

 <script data-require="underscore.js@1.8.3" data-semver="1.8.3" src="//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script> 

Answer 3

You could use a single approach and build the result in one task.

Your wanted result is in pivot[0] and pivot[1] .

 var multArrary = [['a', 'b'], ['c', 'd'], ['f', 'g']], pivot = multArrary.reduce(function (r, a) { a.forEach(function (b, i) { r[i] = r[i] || []; r[i].push(b); }); return r; }, []); console.log(pivot);