JavaScript object property containing dot

Question

I am trying to order an array of objects with the lodash orderBy function. When the iteratees contains a dot in the middle, the orderBy does not work any more.

Here is a plunker to explain the problem better. plunker

ar users = [
     { 'user': 'fred',   'age': 48 },
     { 'user': 'barney', 'age': 34 },
     { 'user': 'fred',   'age': 40 },
     { 'user': 'barney', 'age': 36 }
];

_.orderBy(users, ['user', 'age'], ['asc', 'desc']);

Any help will be appreciated.

Thank you in advance.

Answer 1

You could create a function for the access to exotic key names.

const
    getPDot = o => o.value['p.'].val,
    data = [{ id: 'b', value: { 'p.': { val: 2 } } }, { id: 'a', value: { 'p.': { val: 1 } } }, { id: 'c', value: { 'p.': { val: 3 } } }];


console.log(_.orderBy(data, [getPDot], ['asc']));

.as-console-wrapper { max-height: 100% !important; top: 0; }

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js"></script>

A dynamic approach with a closure over key.

const
    getValue = key => o => o.value[key].val,
    data = [{ id: 'b', value: { 'p.': { val: 2 } } }, { id: 'a', value: { 'p.': { val: 1 } } }, { id: 'c', value: { 'p.': { val: 3 } } }];


console.log(_.orderBy(data, [getValue('p.')], ['asc']));

.as-console-wrapper { max-height: 100% !important; top: 0; }

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js"></script>

ES5

const
    getValue = function (key) {
        return function (o) {
            return o.value[key].val;
        };
    }
    data = [{ id: 'b', value: { 'p.': { val: 2 } } }, { id: 'a', value: { 'p.': { val: 1 } } }, { id: 'c', value: { 'p.': { val: 3 } } }];


console.log(_.orderBy(data, [getValue('p.')], ['asc']));

.as-console-wrapper { max-height: 100% !important; top: 0; }

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js"></script>