JAVASCRIPT

deep copy in javascript

FOR JAVASCRIPT:

	- Shallow Copy: 
        object2 = object1  

    - Deep Copy:
        object2 = {...object1}       //for arrays: array2 = [...array1]

    - Deep Copy (for Objects with nested Objects):
        object2 = JSON.parse(JSON.stringify(object1));

    - Deep Copy (for objects with nested 'Date object' OR functions):
        1- npm i loadash
        2- const _ = require('loadash');
        3- object2 = _.cloneDeep(object1);

deep copy javascript

function copy(arr1, arr2) {
	for (var i =0; i< arr1.length; i++) {
    	arr2[i] = arr1[i];
    }
}
copy(arr1, arr2)

shallow copy vs deep copy js

/*

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A deep copy means that all of the values of the new variable
are copied and disconnected from the original variable. 
A shallow copy means that certain (sub-)values are still connected
to the original variable. To really understand copying,
you have to get into how JavaScript stores values


/*

js shallow copy

Object.assign({}, obj); // ES6 shallow copy

shallow copy and deep copy in javascript

// shallow copy :: modification in original array
 var newEmployee = employee;

// Deep copy :: no modification in orifinal array
 var newEmployee = JSON.parse(JSON.stringify(employee));