copy object javascript
var x = {key: 'value'}
var y = JSON.parse(JSON.stringify(x))
//this method actually creates a reference-free version of the object, unlike the other methods
//If you do not use Dates, functions, undefined, regExp or Infinity within your objecthow to make a deep copy in javascript
JSON.parse(JSON.stringify(o))deep copy javascript
function copy(arr1, arr2) {
for (var i =0; i< arr1.length; i++) {
arr2[i] = arr1[i];
}
}
copy(arr1, arr2)javascript '=' operator shallow copy or deep copy
// The '=' operator in javascript can serve the purpose of shallow vs
// deep copy.
// The '=' operator in javascript will assign deep copy to primitive
// data types. For example:
let a = 10;
let b = a;
b = 4;
console.log(a);
// Output: 10
console.log(b);
// Output: 4
// The '=' operator in javascript will assign shallow copies to
// non-primitive data types. For example:
let a = ['a','b','c','d','e','f','g'];
let b = a;
b.pop();
console.log(a);
// Output: ["a","b","c","d","e","f"]
console.log(b);
// Output: ["a","b","c","d","e","f"]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
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