TypeScript Array includes() Method
TypeScript includes() method allows you to determine if a specific element is present, within an array.
can also determine if a particular element exists or not at a particular index position.
Syntax:
array.includes(searchElement[, fromIndex])
Parameters:
- searchElement: The value to search for within the array.
- fromIndex (optional): The starting index at which to begin searching.
Return Value:
- It will return true if the array contains the search element, and false otherwise.
Example 1: In this example, we will check whether a given array contains a particular element.
Javascript
// Here we are defing an array const fruits: string[] = [ "apple" , "banana" , "orange" ]; // Here we will check if // the array contains "apple" const hasApple: boolean = fruits.includes( "apple" ); // Here we will print the result on console console.log(hasApple); |
Output:
true
Example 2: In this example, we will check whether a number exists or not at a given particular index position from starting.
Javascript
// Here we are defing an array of numbers const numbers: number[] = [1, 2, 3, 1]; // Declare the starting index // with type annotation const startIndex: number = 2; // Here we will check the number // 1 exists starting from index 2 const foundSecond1: boolean = numbers.slice(startIndex).includes(1); // Print the result on the console window console.log(foundSecond1); |
Output:
true