Table of Contents
Why does indexOf return negative?
int indexOf(String target, int fromIndex) — searches left-to-right for the target as usual, but starts the search at the given fromIndex. If it is negative, the search happens from the start of the string. If the fromIndex is greater than the string length, then -1 will be returned.
What does indexOf return in JavaScript?
The indexOf() method returns the position of the first occurrence of a specified value in a string. The indexOf() method returns -1 if the value is not found. The indexOf() method is case sensitive.
What is the opposite of indexOf JavaScript?
To summarize, charAt() and slice() will help return string values based on index numbers, and indexOf() and lastIndexOf() will do the opposite, returning index numbers based on the provided string characters.
What is a String object in JavaScript?
The String object lets you work with a series of characters; it wraps Javascript’s string primitive data type with a number of helper methods. As JavaScript automatically converts between string primitives and String objects, you can call any of the helper methods of the String object on a string primitive.
What is the difference between indexOf and lastIndexOf in JavaScript?
indexOf() method returns the position of the first occurrence of a specified value in a string. string. lastIndexOf() method returns the position of the last occurrence of a specified value in a string.
What is divide by zero in JavaScript?
Division by zero generates Infinity; Infinity.
Can you use indexOf on an Object JavaScript?
In this article, we will learn about the indexOf() method in an Object array in Javascript. To access the index of the object from the array having a value of an object, We are going to use a few of the methods.
What does indexOf do?
The indexOf() method returns the position of the first occurrence of specified character(s) in a string. Tip: Use the lastIndexOf method to return the position of the last occurrence of specified character(s) in a string.