Brief explanation of each of these JavaScript array methods:
-
reverse(): This method is used to reverse the order of the elements in an array. It modifies the original array and returns the reversed array. -
push(): This method is used to add one or more elements to the end of an array. It modifies the original array and returns the new length of the array. -
sort(): This method is used to sort the elements of an array in ascending order by default, or based on a provided comparison function. It modifies the original array and returns the sorted array.
<!DOCTYPE html>
<html>
<head>
<!-- <script src="main.js"></script> -->
</head>
<body>
<script>
var old_pl = new Array("Cobol", "Fortran", "Algol");
//Reverse
document.write(old_pl.reverse() + "<br>");
//Push New Elements
old_pl.push("Basic", "Asembler", "Simula");
document.write("After Push: " + old_pl + "<br>");
//Sort Elements
old_pl.sort();
document.write("After Sorting: "+ old_pl);
</script>
</body>
</html>
This script creates an array called old_pl with three elements: "Cobol", "Fortran", and "Algol". Then, three array methods are called on the old_pl array.
The first method is reverse(), which reverses the order of the elements in the old_pl array. The resulting reversed array is output to the webpage using the document.write() method.
The second method is push(), which adds three new elements to the end of the old_pl array: "Basic", "Assembler", and "Simula". The modified array is output to the webpage using the document.write() method.
Finally, the sort() method is called on the old_pl array to sort the elements in alphabetical order. The sorted array is output to the webpage using the document.write() method.
The resulting output of this script would be:
Algol,Fortran,Cobol
After Push: Algol,Fortran,Cobol,Basic,Assembler,Simula
After Sorting: Algol,Assembler,Basic,Cobol,Fortran,Simula
The first line shows the reversed old_pl array, with the elements in reverse order. The second line shows the old_pl array after the push() method has added the new elements. The third line shows the old_pl array after the sort() method has sorted the elements in alphabetical order.
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