TypeScript Array includes() Method |
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TypeScript Array includes() Method
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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: trueExample 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
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