_.fromPairs

Returns an object composed from key-value pairs.

// Underscore/Lodash
_.fromPairs([['a', 1], ['b', 2]]);
// => { 'a': 1, 'b': 2 }
 
// Native
const fromPairs = function(arr) {
  return arr.reduce(function(accumulator, value) {
    accumulator[value[0]] = value[1];
    return accumulator;
  }, {})
}
 
// Compact form
const fromPairs = (arr) => arr.reduce((acc, val) => (acc[val[0]] = val[1], acc), {})
 
fromPairs([['a', 1], ['b', 2]]);
// => { 'a': 1, 'b': 2 }

Browser Support for Array.prototype.reduce()

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