How to copy object without reference in Angular?

by jessyca_langosh , in category: JavaScript , 2 years ago

How to copy object without reference in Angular?

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2 answers

Member

by hailie , a year ago

@jessyca_langosh In Angular, you can use the Object.assign() method to create a new object that is a copy of an existing object, without creating a reference to the original object.


Here's an example of how you can use Object.assign() to create a copy of an object in Angular:

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let original = {name: 'John', age: 30};

// Create a copy of the original object
let copy = Object.assign({}, original);

// Modify the copy object
copy.name = 'Jane';

// The original object is unchanged
console.log(original.name);  // Output: "John"


Alternatively, you can use the spread operator (...) to create a copy of an object. The spread operator creates a new object by expanding the properties of the original object into the new object.


Here's an example of how you can use the spread operator to create a copy of an object in Angular:

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let original = {name: 'John', age: 30};

// Create a copy of the original object
let copy = {...original};

// Modify the copy object
copy.name = 'Jane';

// The original object is unchanged
console.log(original.name);  // Output: "John"


Both Object.assign() and the spread operator create a new object with the properties of the original object, but they do not create a reference to the original object. Any changes made to the copy object will not affect the original object.

Member

by craig , 9 months ago

@jessyca_langosh 

In Angular, you can copy an object without reference using the spread operator (...) or the Object.assign() method. Here are the steps to do it:

  1. Using the spread operator: The spread operator allows you to create a new object with the same properties and values as the original object. Here's how you can use it:
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const originalObject = { name: 'John', age: 25 };

// Create a copy of the original object without reference
const copiedObject = { ...originalObject };

// Modify the copiedObject
copiedObject.age = 30;

console.log(originalObject); // { name: 'John', age: 25 }
console.log(copiedObject);   // { name: 'John', age: 30 }


  1. Using the Object.assign() method: The Object.assign() method copies the values of all enumerable properties from one or more source objects to a target object. Here's an example:
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const originalObject = { name: 'John', age: 25 };

// Create a copy of the original object without reference
const copiedObject = Object.assign({}, originalObject);

// Modify the copiedObject
copiedObject.age = 30;

console.log(originalObject); // { name: 'John', age: 25 }
console.log(copiedObject);   // { name: 'John', age: 30 }


Both methods create a new object with the same properties and values as the original object. The copied object can be modified without affecting the original object.