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Increment and decrement array elements in JavaScript

You can also use increment and decrement operations:

let arr = [1, 2, 3, 4]; arr[0]++; ++arr[1]; arr[2]--; --arr[3]; console.log(arr); // shows [2, 3, 2, 3]

Create an array with elements 1, 2 and 3. Use the ++ operator to increase each array element by one.

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