How to useArray.indexOf() method in Typescript
The indexOf method returns the index of the first occurrence of a specified element in an array. If the element is not present, it returns -1.
Syntax:
const index = myArray.indexOf("yourString");
const arrayContainsString = index !== -1;
Example: In this example, we are using Array.indexof() method.
const myArray: string[] = ["apple",
"banana", "orange"];
const searchString: string = "banana";
if (myArray.indexOf(searchString) !== -1) {
console.log(`Array contains the
string '${searchString}'.`);
} else {
console.log(`Array does not contain
the string '${searchString}'.`);
}
Output:
Array contains the string 'banana'.
How to Check Whether an Array Contains a String in TypeScript ?
To check whether an array contains a string in typescript we have a different approach. In this article, we are going to learn how to check whether an array contains a string in typescript.
Below are the approaches to check whether an array contains a string in typescript:
Table of Content
- Approach 1: Using Array.includes() method
- Approach 2: Using Array.indexOf() method
- Approach 3: Using Array.some() method
- Approach 4: Using Array.find() method
- Approach 5: Using Array.find() method with a boolean condition
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