JavaScript Array includes() Method
The includes() method returns true if an array contains a specified value. Conversely, it returns false if the value is not found. This method simplifies checking for the presence of an element within an array, providing a straightforward boolean result.
Syntax
array.includes(searchElement, start);
Parameters
- searchElement: This parameter holds the element that will be searched.
- start: This parameter is optional and it holds the starting point of the array, where to begin the search the default value is 0.
Return Value
It returns a Boolean value i.e., either True or False.
Example 1: Searching for number in an array
Here, the method will search for element 2 in that array.
// Taking input as an array A
// having some elements.
let A = [1, 2, 3, 4, 5];
// includes() method is called to
// test whether the searching element
// is present in given array or not.
a = A.includes(2)
// Printing result of includes().
console.log(a);
Output
true
Example 2: Searching for a string in an array
Here, the method will search for the element ‘cat’ in that array and returns false as ‘cat’ is not present in the array.
// Taking input as an array A
// having some elements.
let name = ['gfg', 'cse', 'Beginner', 'portal'];
// includes() method is called to
// test whether the searching element
// is present in given array or not.
a = name.includes('cat')
// Printing result of includes()
console.log(a);
Output
false
We have a complete list of Javascript Array methods, to check those please go through this Javascript Array Complete referencearticle.
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