arr_Map.html

<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <script>
var student = [
    {
        name:"venkat",
        age:"21",
        sub:"angular"
    },
    {
        name:"venkateshwar",
        age:"22",
        sub:"vueJs"
    },
    {
        name:"warner",
        age:"18",
        sub:"react"
    },
    {
        name:"ausvenkat",
        age:"20",
        sub:"angular"
    },
    {
        name:"sathya",
        age:"24",
        sub:"react"
    },
    {
        name:"venu",
        age:"19",
        sub:"angular"
    },
];

var sub = student.filter((subs)=>subs.sub.includes("ang"));
console.log(sub);

var find = student.filter((names)=>names.name.includes("v"));
console.log(find);

var age = student.filter((ages)=>ages.age<20);
console.log(age);

</script>
</body>
</html>