Is there a way to combine all the properties from multiple objects in an array into a single object using lodash without using apply or iterating through the array?
const arr = [{1:1, 2:2}, {3:3}, {4:4}];
_.merge({}, ...arr); // {1:1, 2:2, 3:3, 4:4};
View this Unique Example
One approach would be to utilize the functions each and extend:
var myObject = {};
var myArray = [{1:1, 2:2},{3:3},{4:4}];
_.each(myArray, function(element) {
_.extend(myObject, element);
});
Another method is to use reduce instead:
var alternateWay = _.reduce(myArray, function(object, nextItem) {
return _.extend(object, nextItem);
}, {});
Seems like a great opportunity to utilize the [].reduce method in JavaScript:
const sampleArray = [{1:1, 2:2},{3:3},{4:4}];
const finalResult = sampleArray.reduce((accumulator, currentValue) => Object.assign(accumulator, currentValue), {});
console.log(finalResult)With ES6, you have the capability to perform the following:
const arr = [{1:1, 2:2},{3:3},{4:4}];
_.merge(...arr);
This approach is best utilized when targeting new browser versions that support ES6 or when utilizing a transpiler such as Babel.
If you choose not to utilize ES6, then there is no reason to avoid using .apply, which is a built-in feature of Javascript. It is unnecessary for Lodash to duplicate this functionality. It is important to remember that libraries should complement rather than replace core language features. Other solutions based on loops like .reduce and .each are less efficient compared to both _.merge and Object.assign, as they can handle more than two parameters efficiently.
To prevent any mutation of the items in the array, you can utilize the combination of reduce() and merge(). By setting an empty object as the base object for the merge function, you ensure that no changes are made to the original array elements.
var arr = [{1:1, 2:2},{3:3},{4:4}];
var result = _.reduce(arr, _.merge, {});
document.write('<pre>' + JSON.stringify(result, 0, 4) + '</pre>');<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.11.2/lodash.js"></script>Please note that the current solution you are using may lead to mutations within the array items.
If you're looking for a fun and goofy solution, here's one: considering that Object.assign() only creates shallow copies, it might be more efficient if you want to avoid recursive operations.
var arr = [{1:1, 2:2},{3:3},{4:4}],
merged = JSON.parse(arr.reduce((s,o)=> s+JSON.stringify(o),"").replace(/}{/g,","));
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