Map() in Java Script

What is Map ?
Map is a collection of key and value pairs, similar to Object. The main difference between a Map and an Object is that Map allows key on any type either primitive or an object. Let’s learn how to create a Map and do operations on it.

    var array = ["this is react js","<br>",999,"<br>",9];

    var abc = array.map((value)=>{
        console.log(value);
        document.write(value)
    });

    console.log(abc);

Object with Map() method

    <script>

    var abc =[
        {
            sname:"ramesh",
            course:"rjs",
            addrress:"bangalore",
        },
        {
            sname:"ramesh",
            course:"rjs",
            addrress:"bangalore",
        },
        {
            sname:"ramesh",
            course:"rjs",
            addrress:"bangalore",
        },
        {
            sname:"ramesh",
            course:"rjs",
            addrress:"bangalore",
        }
    ]

    var msg = abc.map((value)=>{
        return value.sname;
    });

    document.write(msg);
    console.log(msg);

    var course = abc.map((course)=>{
        return course.course;
    })

    document.write(course);
    console.log(course);        

</script>

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