INDEX OF AND LAST INDEX OF METHOD IN JAVASCRIPT

Опубликовано: 16 Июнь 2026
на канале: SmituCodes

In JavaScript, indexOf and lastIndexOf are methods used to find the position of an element within a string or array. Here’s a brief overview of each:

indexOf
Purpose: Finds the first occurrence of a specified value in a string or array.
Syntax: stringOrArray.indexOf(searchElement, fromIndex)
Parameters:
searchElement: The value to search for.
fromIndex (optional): The index to start the search from. Defaults to 0.
Returns: The index of the first occurrence of the specified element, or -1 if it is not found.
Example:

const str = "hello world";
console.log(str.indexOf("o")); // Output: 4
console.log(str.indexOf("x")); // Output: -1
lastIndexOf
Purpose: Finds the last occurrence of a specified value in a string or array.
Syntax: stringOrArray.lastIndexOf(searchElement, fromIndex)
Parameters:
searchElement: The value to search for.
fromIndex (optional): The index to start the search from, moving backwards. Defaults to the last index.
Returns: The index of the last occurrence of the specified element, or -1 if it is not found.
Example:

const str = "hello world";
console.log(str.lastIndexOf("o")); // Output: 7
console.log(str.lastIndexOf("x")); // Output: -1
Use Cases
Use indexOf when you need the first position of an element.
Use lastIndexOf when you need the last position, especially helpful if the element might appear multiple times.
These methods are helpful for searching specific elements within strings or arrays and are frequently used in text parsing or array manipulation tasks....#learnhtml5andcss3#codingchallenge #code #webdevelopment #codewithme #codewithharry#Trending
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