Trying to make array with certain length

Question

I'm trying to create an array from two other arrays using a loop, where in both arrays I compare two strings and when I find two strings that are the same I push the value to the array from second compared array, and if I don't find it I push 0. The problem is that the array has to be exactly the length of the first array.

const array1 = ['21', '22', '23', '24', '25', '26', '27'] const array2 = [{score: 1, date: '21'}, {score: 3, date: '23'} ]

output should look like this: [1, 0, 3, 0, 0, 0, 0] <=== this array must have length of array1, and i have problem to create proper loop, or maybe this is shouldnt be loop?

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– sohaieb azaiez, Commented Mar 26, 2022 at 11:02

JSON Derulo · Accepted Answer · 2022-03-26 13:44:21Z

You can achieve this by combining map() (to iterate over the first array) and find() (to get the right score out of the second array). To fall back to 0 in case there is no result in array2, you can combine optional chaining with nullish coalescing.

const array1 = ['21', '22', '23', '24', '25', '26', '27']; const array2 = [{score: 1, date: '21'}, {score: 3, date: '23'} ]; const array3 = array1.map(value => array2.find(obj => obj.date === value)?.score ?? 0); console.log(array3);

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