JavaScript Map Array Of Objects
Last Updated : Mar 11, 2024
IN - JavaScript | Written & Updated By - Ashish
In this tutorial we will show you the solution of JavaScript map array of objects, map is a collection of elements where each element is stored as a key, value pair.
Here we defined one array then using map object generated new array objects with already defined array. It is done by some calculation we created map objects.
Step By Step Guide On JavaScript Map Array Of Objects :-
Here we defined one array with some numerical values and while creating map object we appends array with that by some calculation. Map can hold both objects and primitive values as either key or value.
When we iterate over the map object it returns the key, value pair in the same order as inserted.
It can also hold array within array and key array, value array is respective key name values.
<!DOCTYPE html>
<html>
<head>
<title>Map Array</title>
</head>
<body>
<script>
var arr=[1,3,5,10];
var map1= arr.map(x=>x*2);
console.log("Map1");
console.log(map1);
</script>
</body>
</html>
- <!DOCTYPE html> tag which is instruct the web browser about what version of HTML file written in and it’s not have any ending tag.
- The<html> tag is used to indicate the beginning of HTML document.
- As above shown <head> tag is contains information about webpage and external file links are declared here. <title> tag is used for set the webpage title.
- Both <head> and <title> tags having their pair end tag, so we need to close the ending tags respectively. If you’re not closed anyone of ending tag properly that is also affect the webpage result.
- <body> tag is beginning of main coding part because it contain coding of entire website blocks and elements described here.
- Within <script> tag we defined our javascript program, here we defined array ‘arr’ with numeric values ‘1,3,5,10’ and map object created with array ‘arr’.
- The new array created by ‘x=>x*2’ this calculation so our new array had value as multiplication of ‘2’ and result map object array value is ‘2,6,10,20’.
- Then printed result using ‘console.log()’ method. Console.log() is a function in javascript which is used to print any kind of variables defined before in it or to just print any message that needs to be displayed to the user. Its output display on the javascript console.
- In browser for open javascript console use the shortcut ‘ctrl+shift+j’ then console panel will open at right hand side there we can see our result.
- Both </body>,</html> tags closed respectively. </body> tag indicates the end of body, Then </html> tag indicates the end of HTML document.
Conclusion :-
In conclusion we are able to know how to create map object array using javascript.
When we execute our program on browser we can’t see the result so we have to use that shortcut ‘ctrl+shift+j’ then result will displayed on console by console.log() method.
This method only will print any message or value on the console, for generally printing values or string on webpage in javascript we had many inbuilt methods.
We will see all these methods in future. I hope this tutorial on JavaScript map array of objects helps you and the steps and methods mentioned above are easy to follow and implement.
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