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Array Methods



Array Methods


concat() method

concat() method in JavaScript is used to add two arrays and create a new array.It does not change anything in the original array content. 



  <script>
  
    var a=[1,2,3,4,5];
    var b=[6,7,8,9,10];
    var c=a.concat(b);
    document.writeln(c);

</script>


copyWithin() method

copyWithin() method is use to copy array elements inside it's own elements and produce a new modify array. 


  <script>

         
      var a=["java","python","php","AI"];
    var res=a.copyWithin(0,1,2);
    document.write(res);//It return python


</script>

entries() method

entries() method is used to create an iterator object in JavaScript,which is used to hold key/value pairs inside an array. 


  <script>

          var a=["java","python","ML","AI"];
var itr=a.entries();
for(var b of itr)
{
 document.writeln(b);
}
        
</script>

every() method

every() method in JavaScript is use to check whether the elements are satisfying the proper conditions or not. 


  <script>
    var a=[5,10,15,2];
    function checking(a)
    {
     return a>5;

    }

    document.writeln(a.every(checking)); //It return's false because a[3]=2;


</script>

toString() method

toString() method is used to convert array elements into string format. 


  <script>

        var name=['c','o','d','e','s','f','a','m','i','l','y'];
        var res=name.toString();
        document.write(res);



</script>

slice() method

slice() method is use to get a particular slice inside an array according to our requirement. 

  <script>
 
    var a=["hp","dell",'acer',"lenovo","sony"];
    var res=a.slice(1,2);
    document.write(res);

</script>

sort() method

sort() method is used to sort array elements in JavaScript. 


  <script>

    var a=["z","a","x","k"];
        var res=a.sort();
        document.write(res);


</script>


push() method

push() method is used to insert new array elements inside an array. 

  <script>

        var a=["java","php","javascript"];
        a.push("python");
        document.write(a);



</script>

pop() method

pop() method is used to delete last element inside an array. 


  <script>
    var a=[10,20,30,40,50]
  document.writeln("array elements "+a+"
");
var res =a.pop();
document.writeln("Deleted element: "+res+"
");
document.writeln("Remaning elements: "+a);



</script>

reverse() method

reverse() method is used to reverse an array. 


  <script>
var a=["java","php","JavaScript","HTML"];
document.write("Original array elements: "+a+"
");
a.reverse();
document.write("Reverse array elements: "+a+"
");
     

</script>

shift() method

shift() method is used to remove and return first elements of an array. 


  <script>

   var a=["java","php","JavaScript","HTML"];
    var res=a.shift();
    document.write(res);


</script>


of() method

of() method is used to create and return new array in JavaScript. 

  <script>

    document.write(Array.of(10,20,30));


</script>


lastIndexOf() method

lastIndexOf() method is used to search array element position to the given array up to last index position. 

  <script>

   var a=["java","php","java Script","HTML","java"];
    var res=a.lastIndexOf("java");
    document.write(res);


</script>


join() method

join() is used to combine array elements into a string and return's a new string. 

  <script>

      var a=["java","php","JavaScript","HTML","java"];
      var res=a.join();
      document.write(res);


</script>



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