JavaScript/js_array1.html at master · vishal-vaish/JavaScript · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>

    <h1>JS Arrays 1</h1>
<div class="row">
  <div class="col md-6">
    <h3>Array :</h3>
    <h3>[<span id="array"></span>]</h3>
  </div>
  <div class="col md-6" id="actions">
    <h3>Actions</h3>
    <button type="button" id="sort" class="btn btn-primary">Sort</button>
    <button type="button" id="revsort" class="btn btn-primary">Reverse Sort</button>
    <button type="button" id="first5" class="btn btn-primary">First 5</button>
    <button type="button" id="last5" class="btn btn-primary">Last 5</button>
    <button type="button" id="avg" class="btn btn-primary">Average</button>
  </div>
</div>
</body>
</html>
<style>

@import url('https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css');

h1 {
  text-align: center;
  margin: 10px;
}
h3 {
  text-align: center;
}
#actions {
  margin: auto;
}
.btn{
  margin-bottom: 2px;
}
</style>

<script>

window.onload = function () {
  init();
};
var arr = [];
for (let i = 0; i < 10; i++) {
  arr.push(Math.floor(Math.random() * 100));
}
function init(params) {
  var ele = document.getElementById('array');
  console.log(arr);
  ele.innerText = arr;
}
var arrcopy=[]
for(let j=0;j<arr.length;j++){
arrcopy[j]=arr[j];}

//sort
let sort=document.getElementById("sort");
sort.addEventListener('click',function(){
  arrcopy.sort(function(a,b){ return a-b});
  alert(arrcopy.toString());
 // arrcopy=[]
 // console.log("copy",arrcopy)
})
//reversesort
let reverse=document.getElementById("revsort");
reverse.addEventListener('click',function(){
  var arrcopy1=[]
for(let j=0;j<arr.length;j++){
arrcopy1[j]=arr[j];}

 // console.log("reverse copy",arrcopy1)
  arrcopy1.sort(function(a,b){ return a-b});
  arrcopy1.reverse();
  alert(arrcopy1.toString());
})
//first five
let first5=document.getElementById("first5");
first5.addEventListener('click',function(){
  const a=arr.filter(function(e,i){
    return i<5;
  })
  alert(a.toString());
})

//last five
let last5=document.getElementById("last5");
last5.addEventListener('click',function(){
   const b=arr.filter(function(e,i){
    return i>=5;
  })
  alert(b.toString());
})

//average
let avg=document.getElementById("avg");
avg.addEventListener('click',function(){
    let sum
avg.addEventListener("click",function(){
     sum=arr.reduce(function(a,e){
        return a+e;
    })
    alert(sum/10);
    })
})


</script>