Lodash mapvalues

Lodash mapValues

var users = {  'fred':    { 'user': 'fred',    'age': 40 },  'pebbles': { 'user': 'pebbles', 'age': 1 }};

_.mapValues(users, function(o) { return o.age; });
// => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed) 

// The `_.property` iteratee shorthand.
_.mapValues(users, 'age');
// => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)

Source: lodash.com

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