Description 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. The indexOf() method is case sensitive.
Learn how to use indexOf () in JavaScript with syntax, examples, best practices, and comparisons with includes (). Perfect for beginners. Tagged with javascript, webdev, beginners, programming.
indexOf () Return Value Returns the first index of the element in the array if it is present at least once. Returns -1 if the element is not found in the array. Note: indexOf() compares searchElement to elements of the Array using strict equality (similar to triple-equals operator or ===).
The indexOf () method in JavaScript is used to find the index of the first occurrence of a specified value within a string. The method returns a 0-based index, making it a fundamental JavaScript string manipulation way.
The JavaScript indexof method returns the index position of the first occurrence of a specified string. If the specified string is not found, the indexof function will return -1.
The .indexOf() method returns the first index at which a specified element can be found in an array, or -1 if the element is not present. This method searches the array from left to right and uses strict equality comparison to match elements.
The JavaScript indexof method returns the index position of the first occurrence of a specified string. If the specified string is not found, the indexof function will return -1.