CODEWITHSUNDEEP
javascript
George Barda
George Barda

Reputation: 55

how to check if an array contains the elements from a sub array

i want to check i an array contains the elements of any sub array, i.e. array1 = [10,11,12] array 2 = [[10, 11],[20, 21],[30, 31],[40, 41]];

array1 will be checked in series by each of array2's sub arrays and if the sub array elements are also in the array1 then to return true.

i've tried thing like:

      array2.some((arr) => {
        return arr.every((square) => {
          return array1.includes(square);
        });
      });

or

    for (let elem of array2) {
        if (elem.every((x) => array1.includes(x))) {
          return false;
        } else {
          return true;
        }
      }

any advice would be helpfull. thank you

Upvotes: 2

Views: 727

Answers (1)

Nina Scholz
Nina Scholz

Reputation: 386858

You need to iterate the sub array as well for the sequence.

const
    array1 = [10, 11, 12],
    array2 = [[10, 11], [20, 21], [30, 31], [40, 41]],
    result = array2.some(a => {
        for (let i = 0, l = array1.length - 1; i < l; i++) {
            if (a.every((v, j) => v === array1[i + j])) return true;
        }
        return false;        
    });

console.log(result);

Upvotes: 2

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