14. LastIndexOf() Method - FindIndex() - Find() - Some() - Every()-JavaScript Built-in Array Methods

By the end of this video you will be able to

1. Find the index of a particular Element from last
2. Find the index of a particular element that satisfies the Testing Function
3. Find the Element that satisfied the Testing function
4. Understand the Some() and every() method
5. Understand the working of Testing Fuction

In order to understand this video better please watch the following

ARROW FUNCTIONS IN JS :-


The lastIndexOf() method returns the index within the calling String object of the last occurrence of the specified value, searching backwards from fromIndex. Returns -1 if the value is not found.

The lastIndexOf() method is case sensitive. For example, the following expression returns -1:

The findIndex() method returns the index of the first element in the array that satisfies the provided testing function. Otherwise, it returns -1, indicating that no element passed the test

he some() method tests whether at least one element in the array passes the test implemented by the provided function. It returns a Boolean value.

The every() method tests whether all elements in the array pass the test implemented by the provided function. It returns a Boolean value.

he find() method returns the value of the first element in the array that satisfies the provided testing function. Otherwise undefined is returned.

14. LastIndexOf() Method - FindIndex() - Find() - Some() - Every()-JavaScript Built-in Array Methods