How to get the Index of Specified Element in an Array in TypeScript - Step by Step Examples

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How to get the Index of Specified Element in an Array in TypeScript ?

Answer

To get the index of a specified element in an array in TypeScript, you can use methods like indexOf.

✐ Examples

1 Index of Element in Integer Array using indexOf

In this example,

We create an integer array named numbers with values 10, 20, 30, 40, 50.
We use the indexOf method to find the index of a specific element in the array.
The indexOf method returns the index of the first occurrence of the element, or -1 if the element is not found.

TypeScript Program

const numbers: number[] = [10, 20, 30, 40, 50];
const index: number = numbers.indexOf(30);
console.log(`Index of element 30 is: ${index}`);

Output

Index of element 30 is: 2

2 Index of Element in String Array using indexOf

In this example,

We create a string array named fruits with values 'apple', 'banana', 'cherry'.
We use the indexOf method to find the index of a specific element in the array.
The indexOf method returns the index of the first occurrence of the element, or -1 if the element is not found.

TypeScript Program

const fruits: string[] = ['apple', 'banana', 'cherry'];
const index: number = fruits.indexOf('banana');
console.log(`Index of 'banana' is: ${index}`);

Output

Index of 'banana' is: 1

Summary

In this tutorial, we learned How to get the Index of Specified Element in an Array in TypeScript language with well detailed examples.

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How to get the Index of Specified Element in an Array in TypeScript - Step by Step Examples

How to get the Index of Specified Element in an Array in TypeScript ?

Answer

✐ Examples

1 Index of Element in Integer Array using indexOf

TypeScript Program

Output

2 Index of Element in String Array using indexOf

TypeScript Program

Output

Summary

More TypeScript Arrays Tutorials