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TypeScript - get index of item in array
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In this article, we would like to show you how to get the index of item in an array in TypeScript.
Quick solution:
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const numbers: number[] = [1, 2, 3];2
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const result = numbers.indexOf(2);4
console.log(result); // 1
In this example, we use indexOf() method to find the index of the specific item in the numbers array.
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const numbers: number[] = [1, 2, 3];2
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console.log(numbers.indexOf(1)); // 04
console.log(numbers.indexOf(2)); // 15
console.log(numbers.indexOf(5)); // -1Output:
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-1Example with an array of strings:
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const letters: string[] = ['A', 'B', 'C'];2
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console.log(letters.indexOf('A')); // 04
console.log(letters.indexOf('B')); // 15
console.log(letters.indexOf('X')); // -1Output:
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-1Note:
If the specified value is not present in the array, the
indexOf()method returns-1.
