IndexOf() and LastIndexOf() functions in JavaScript - #55

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Introduction
Here's a breakdown of the indexOf() and lastIndexOf() functions in JavaScript, including their syntax, descriptions, differences, advantages, and disadvantages:

indexOf() Function:
The indexOf() function in JavaScript returns the first index at which a specified element can be found in the array, or -1 if it is not present.

Syntax:
JavaScript code:
searchElement: The element to search for within the array.
fromIndex (Optional): The index to start the search from. If omitted, the search starts from index 0.

Description:
The indexOf() function searches for the specified element within the array and returns the index of the first occurrence of that element. If the element is not found, it returns -1.

Advantage:
Quickly finds the index of the first occurrence of an element in an array.

Disadvantage:
Only returns the index of the first occurrence, not all occurrences.

lastIndexOf() Function:
The lastIndexOf() function in JavaScript returns the last index at which a specified element can be found in the array, or -1 if it is not present.

Syntax:
JavaScript code:
searchElement: The element to search for within the array.
fromIndex (Optional): The index to start the search from. If omitted, the search starts from the end of the array.

Description:
The lastIndexOf() function searches for the specified element within the array, starting from the end, and returns the index of the last occurrence of that element. If the element is not found, it returns -1.

Difference:
indexOf() searches for the first occurrence of an element, while lastIndexOf() searches for the last occurrence.

Advantage:
Useful when you need to find the index of the last occurrence of an element in an array.

Disadvantage:
Only returns the index of the last occurrence, not all occurrences.

Example:
JavaScript code:
const numbers = [1, 2, 3, 4, 5, 3];

In this example, indexOf() returns the index of the first occurrence of 3 in the array, which is 2. lastIndexOf() returns the index of the last occurrence of 3, which is 5.

Chapter :
00:00 Introduction
00:17 Syntax
00:45 Example
01:41 Summery

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