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Find repeating elements in a given array

Published: November 19, 2021Last updated: November 19, 2021array, duplicate, JavaScript, repeat

The problem:

Write a program to show repeating elements in an array. Consider the time complexity when writing code.

Problem description

The array length can be any integer (N) and print the number as soon as you find a duplicate.

    const arr = [2, 7, 4, 7, 8, 3, 4];
    for(let i = 0; i < arr.length; i++){
        for(let j = 0; j <= i; j++) {
            if(arr[j] === arr[i] && j !== i){
                console.log(arr[i]);
                break;
            }
        }
    }

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