How do you clone a value in JavaScript?

How do you clone a variable in JavaScript?

var clone = Object. assign({}, obj); The Object. assign() method is used to copy the values of all enumerable own properties from one or more source objects to a target object.

What is cloning an object in JavaScript?

“Cloning” an object in JavaScript means creating a new object with the same properties as the original object. Objects in JavaScript are stored by reference, which means that two variables can point to the same object in memory.

How do you deep copy an object in JavaScript?

Using the spread syntax or Object. assign() is a standard way of copying an object in JavaScript. Both methdologies can be equivalently used to copy the enumerable properties of an object to another object, with the spread syntax being the shorter of the two.

What is shallow and deep copy?

A shallow copy constructs a new compound object and then (to the extent possible) inserts references into it to the objects found in the original. A deep copy constructs a new compound object and then, recursively, inserts copies into it of the objects found in the original.

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Is object assign a deep copy?

Object. assign does not copy prototype properties and methods. This method does not create a deep copy of Source Object, it makes a shallow copy of the data. For the properties containing reference or complex data, the reference is copied to the destination object, instead of creating a separate object.

What is the most efficient way to deep clone an object in JavaScript?

Conclusion. According to the benchmark test, the fastest way to deep clone an object in javascript is to use lodash deep clone function since Object.

Is JS pass by reference?

In Javascript objects and arrays follows pass by reference. so if we are passing object or array as an argument to the method, then there is a possibility that value of the object can change.

What is the difference between object assign and object create?

Object. create defines properties and Object. assign only assigns them. When creating a property, assignments will create it as configurable, writable and enumerable.

What is Destructuring in JavaScript?

Destructuring is a JavaScript expression that allows us to extract data from arrays, objects, and maps and set them into new, distinct variables. Destructuring allows us to extract multiple properties, or items, from an array​ at a time.