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find array is duplicate or not

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WinMaw answered on August 6, 2021 Popularity 8/10 Helpfulness 2/10

answer find array is duplicate or not

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find array is duplicate or not

Comment

  const numbers = [1, 2, 3, 2, 4, 5, 5, 6];

let isDuplicate = false;

// Outer for loop
for (let i = 0; i < numbers.length; i++) {
    // Inner for loop
    for (let j = 0; j < numbers.length; j++) {
        // Skip self comparison
        if (i !== j) {
            // Check for duplicate
            if (numbers[i] === numbers[j]) {
                isDuplicate = true;
                // Terminate inner loop
                break;
            }
        }
        // Terminate outer loop
        if (isDuplicate) {
            break;
        }
    }
}

if (!isDuplicate) {
    console.log(`Array doesn't contain duplicates.`);
} else {
    console.log(`Array contains duplicates.`);
}
// Output: Array contains duplicates.

Popularity 8/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: find whatever

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Contributed on Sep 06 2022

WinMaw

0 Answers Avg Quality 2/10

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how to find duplicates in an array

Comment

const numbers = [1, 2, 3, 2, 4, 5, 5, 6];

const set = new Set(numbers);

const duplicates = numbers.filter(item => {
    if (set.has(item)) {
        set.delete(item);
    } else {
        return item;
    }
});

console.log(duplicates);
// [ 2, 5 ]

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: attacomsian.com

Tags: find

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Contributed on Jul 23 2022

Samuel Abusa Kennedy

0 Answers Avg Quality 2/10

find duplicates in array

Comment

function findDuplicates(arr) {
	const duplicates = new Set()
  
  return arr.filter(item => {
  	if (duplicates.has(item)) {
    	return true
    }
    duplicates.add(item)
    return false
  })
}

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: find

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Contributed on Aug 06 2021

Raserad

0 Answers Avg Quality 2/10

find duplicate element on array

Comment

const order = ["apple", "banana", "orange", "banana", "apple", "banana"];

const result = order.reduce(function (prevVal, item) {
    if (!prevVal[item]) {
        // if an object doesn't have a key yet, it means it wasn't repeated before
        prevVal[item] = 1;
    } else {
        // increase the number of repetitions by 1
        prevVal[item] += 1;
    }

    // and return the changed object
    return prevVal;
}, {}); // The initial value is an empty object.

console.log(result); // { apple: 2, banana: 3, orange: 1 }

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: practicum.yandex.com

Tags: element

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Contributed on Dec 27 2021

Cruel Cormorant

0 Answers Avg Quality 2/10

find array is duplicate or not

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