_.extend vs _.clone in lodash

Question

To inherit the properties of one object from another when working with JavaScript objects, I often see a use _.clonewhere there was an intention to create an object with other properties of the object, and then it will be expanded.

Why can't we use _.extend, which is more important for expanding an object?

Please tell me the difference between the two and why we cannot _.extendinstead _.clone, which is an expensive operation.

Answer 1

_.extend . _.clone , . , _.extend _.assignIn.

_.assignIn(object, [sources])

. object.

https://lodash.com/docs/4.17.2#assignIn

. _.clone:

https://lodash.com/docs/4.17.2#clone

Answer 2

_.extend() , . _.clone(), .

, , :

_.extend({}, originalObject, {
    additionalProperty: "foo"
})

originalObject. ES2015 JavaScript Object.assign().

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• JavaScript?