String.prototype.indexOf

String.prototype.indexOf() - JavaScript - MDN Web Docs

The indexOf() method of String values searches this string and returns the index of the first occurrence of the specified substring.

JavaScript String indexOf() Method - W3Schools

The indexOf() method returns the position of the first occurrence of a value in a string. The indexOf() method returns -1 if the value is not found.

Array.prototype.indexOf() - JavaScript - MDN Web Docs

The indexOf() method compares searchElement to elements of the array using strict equality (the same algorithm used by the === operator). NaN ...

JavaScript String indexOf() Method - GeeksforGeeks

The indexOf() method in JavaScript is used to find the index of the first occurrence of a specified value within a string.

javaScript Properties and Methods: String.prototype.indexOf()

The indexOf() method returns the starting position of the string object which is called within it. It's very useful for building apps like ...

JavaScript String.prototype.indexOf() - Index Of Explained with ...

The indexOf() method returns the first index at which a specified string can be found in the given String object. If the string is not ...

How to use indexOf with multiple instances of a string pattern?

I would like to String.prototype.indexOf() to retrieve an Object that has a collection of start and end indexes for each instance of the matched ...

devictoribero/implementation-prototype-string-indexof - GitHub

Implementation of the String Prototype indexOf method in Vanilla Javascript. - devictoribero/implementation-prototype-string-indexof.

JavaScript String indexOf() Method

String.prototype.indexOf() ... Summary: in this tutorial, you'll learn how to use the JavaScript String indexOf() method to find the index of the first occurrence ...

Why is String.prototype.indexOf() more performant than a for loop?

Why is String.prototype.indexOf() more performant than a for loop? · 1 · 1 · As to why, it's probably because most JS engines have some native ...

javascript String.prototype.indexOf() - CodeProject Reference

The indexOf() method returns the index within the calling String object of the first occurrence of the specified value, starting the search at fromIndex .

String.prototype.indexOf() - JavaScript - UDN Web Docs: MDN Backup

On this Page ... The indexOf() method returns the index within the calling String object of the first occurrence of the specified value, starting the search at ...

String.prototype.indexOf() vs String.prototype.lastIndexOf()

The indexOf() method is used to return the index of a value/parameter's first appearance, from within a called string. Syntax: indexOf(value) ...

Use String.prototype.includes() instead of String.prototype.indexOf ...

Problem/Motivation In some of Drupal core JavaScript, uses String.prototype.indexOf() method to check the specific string isn't included in ...

How to use JavaScript Array.prototype.indexOf()

Array.prototype.indexOf The indexOf() method returns the first index at which a given element can be found in the array.

22 Text Processing - ECMAScript® 2025 Language Specification

This method returns a Number (a non-negative integral Number less than 2**16) that is the numeric value of the code unit at index pos within the String ...

Array.prototype.indexOf() - JavaScript - UDN Web Docs: MDN Backup

The indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present.

A possible issue of String.prototype.indexOf - mozilla/rhino - GitHub

Version rhino-1.7.12 Test case var NISLFuzzingFunc = function () { var a = 'test'.indexOf('', 5); print(a); }; NISLFuzzingFunc(); ...

Exploring the indexOf Method for Strings and Arrays in JavaScript

Then it returns the index of the first element it finds in the array which satisfies el === target . This means that even if there are two ...

Array.prototype.indexOf() - JavaScript | MDN

The indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present.