Updated April 14, 2023
Introduction to JavaScript Object.assign()
In javascript Object.assign() is one of the default methods and mainly is used to copy the variable values. Its properties from single or multiple user objects that is the source object to the target objects using some POJO method like getter and setter for storing and retrieving the values in the script. It supports all the data type values are assigned and it can hold the variable references and their properties it does not throw the undefined or any null values from the source objects it returns the target object values and its properties.
Syntax:
In javascript client-side validation code, it can be valid the conditions in the browser itself it does not necessary to check the conditions in the server-side for each client request. Among these, it can validate using some default methods and their syntax for code redundancy and reduce the complexity of the application.
<html>
<body>
<script>
var v1="";
var v2=Object.assign({},v1);
document.write(v2);
---some javascript logics---
</script>
</body>
</html>The above codes are the basic syntax for the Object.assign() method in the script it can be used for cloning the objects also sometimes it merging the object with the same properties different sequences.
How JavaScript object.assign() Method Works?
Javascript Object.assign() method is mainly used to copy the variable values and its properties from one or more source objects to the destination objects. Whenever the client is requested through the application end backend it’s creating the instance when comes to the UI the user need will be displayed as the result in the browser. We can initialize and assigned more objects to the target destination instance location it can hold the reference of each variable values and its properties it supports all the datatype values any formats like string, numbers, etc. If the variable contains numbers means it also copied and cloned from source to target location sometimes it contains zeros and non-zero numbers in the variable values and properties act as a default method like Object.assign().We also validate the values in the single variable and n number of variable values itself if suppose the variable contains key-values pair it may be an integer, strings, and special characters or symbols, etc. These values also copied or merged from the source to destination location even though it can be copied/cloned the mathematical values to the destination objects.
We used theObject.assign() method as it copies the enumerable type of objects like creating the variable in the enum it creates the types and its properties from source to target. We used getter and setter methods in the script that is we used getter in source side objects, we want to set the values using setter in target objects. In javascript with the help of a constructor, it will create the objects. Using the constructor its also used for calling the method Object.assign() in where ever it’s needed it can be used and created the instance. Sometimes it also overrides the values and properties by using other objects that also used the same properties it will call it for later in the script with the same order sequences by using parameters. The Errors and Exceptions that happened in sometimes errors like TypeError happened with the property and values is non-writable that is it accepts only the read-only mode we can’t able to edit the property values in the script. If suppose we want to copy the source instance to the target instance know that all the values including references and properties of the source object to the target destination that time the TypeError or some errors happened means the copied operation is not working completely so before the errors and exceptions raised the operation is to be completed.The Object.assign() method does not throw the null or undefined values in both source and target instances.
Examples to Implement JavaScript Object.assign()
Below are the examples of JavaScript Object.assign():
Example #1
Code:
<!DOCTYPEhtml>
<html>
<body>
<script>
var v1 = { i: 11, j: 14, c: 16,i: 11, j: 14, c: 16 ,i: 11, j: 14, c: 16 ,i: 11, j: 14, c: 16 };
var v2 = { i: 50, k: 54,i: 11, j: 14, c: 16 ,i: 11, j: 14, c: 16 ,i: 11, j: 14, c: 16,'sivaraman':'srn','arun':'arun','dadf':'ddff','sdafd':'dafd','ssd':'ssd','sdd':'arsun','sd':'dsv','dsfv':'dsfd','ds':'dsfd','sivaraman':098,'sivaraman':0978,'sivaraman':0985,'sivaraman':0938,'sivaraman':0928,NaN:0/0, };
var v3 = { l: 30,i: 11, j: 14, c: 16,i: 11, j: 14, c: 16,'sivaraman':'srn','arun':'arun','dadf':'ddff','sdafd':'dafd','ssd':'ssd','sdd':'arsun','sd':'dsv','dsfv':'dsfd','ds':'dsfd','sivaraman':098,'sivaraman':0978,'sivaraman':0985,'sivaraman':0938,'sivaraman':0928,NaN:0/0, };
var result = Object.assign({}, v1, v2, v3);
document.write(JSON.stringify(result));
</script>
</body>
</html>Output:
Example #2
Code:
<!DOCTYPEhtml>
<html>
<body>
<script>
functiondemo() {
'use strict';
let v1 = {i: 11, j: 14, c: 16,i: 11, j: 14, c: 16 ,i: 11, j: 14, c: 16 ,i: 11, j: 14, c: 16 };
let v2 = Object.assign({}, v1);
document.write(JSON.stringify(v2));
obj1.i = 1;
document.write(JSON.stringify(v1));
document.write(JSON.stringify(v2));
obj2.i = 2;
document.write(JSON.stringify(v1));
document.write(JSON.stringify(v2));
obj2.j.c = 3;
document.write(JSON.stringify(v1));
document.write(JSON.stringify(v2));
v1 = { i: 11, j: 14, c: 16,i: 11, j: 14, c: 16 ,i: 11, j: 14, c: 16 ,i: 11, j: 14, c: 16 };
let v3 = JSON.parse(JSON.stringify(v1));
v1.a = 4;
v1.b.c = 4;
document.write(JSON.stringify(v3));
}
demo();
</script>
</body>
</html>Output:
Example #3
Code:
<!DOCTYPEhtml>
<html>
<body>
<script>
functiondemo() {
'use ';
var v1 = { i: 11, j: 14, c: 16,i: 11 };
var v2 = { i: 50, k: 54,i: 11, j: 14 };
var v3 = { l: 30,i: 11, j: 14, c: 16 };
var result = Object.assign({}, v1, v2, v3);
document.write(JSON.stringify(result));
}
demo();
</script>
</body>
</html>Output:
Advantages of JavaScript Object.assign()
1. The benefit of the Object.assign() method it allows to copy from more than one source object to the single target object.
2. We can use the method with copied, cloning purposes, and the same sourcing data like values and its properties are copied to the target place without missing.
3. It can copy strings, numbers, special characters, etc and it can support all types of browsers.
Conclusion
Whenever we have used Objects in the programming it’s called a different set of built-in methods that helps to modified and customized the web applications the user needs we have copied and cloned the objects with different sequences and the same will be used for different regions of the application.
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