Convert JavaScript array of 2 element arrays into object key value pairs

Question

What is the fastest algorithm for getting from something like this:

var array = [ [1,\'a\'], [2,\'b\'], [3,\'c\'] ];

to something like this

Answer 1

You can wrap the entire thing within Array.prototype.reduce, like this

function objectify(array) {
    return array.reduce(function(result, currentArray) {
        result[currentArray[0]] = currentArray[1];
        return result;
    }, {});
}

console.log(objectify([ [1, 'a'], [2, 'b'], [3, 'c'] ]));
# { '1': 'a', '2': 'b', '3': 'c' }

We are just accumulating the key-value pairs in the result object and finally the result of reduce will be the result object and we are returning it as the actual result.