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Pushing x number of array items to another array conditionally

I want to push x number of array items to another array with the condition that the maximum number of items that will be pushed be the difference of maxPushLimit (which is 720) and alreadyPushed (so if alreadyPushed is, say, 300, only 420 can be pushed)

Special conditions:

  • If the total of all alreadyPushed from array1 is > total length of array2, ignore the last difference (last x items left from array2.
  • If the total of all alreadyPushed from array1 is < total length of array2, last index of array1 would have redundance (wouldn't be 720, say, 710 if the difference is 10).

I wrote this code to achieve it:
const array1 = [
  {
    id: 1,
    alreadyPushed: 500,
  },
  {
    id: 2,
    alreadyPushed: 600,
  },
  {
    id: 3,
    alreadyPushed: 700,
  },
  {
    id: 4,
    alreadyPushed: 720,
  },
];

const array2 = [];
for (let i = 1; i < 361; i++) {
  array2.push(i);
}

const maxPushLimit = 720;

let results = [];
let array2Index = 0;

for (let i = 0; i < array1.length; i++) {
  const array1Item = array1[i];
  const limit = maxPushLimit - array1Item.alreadyPushed;
  console.log(limit);

  if (limit <= 0) {
    continue;
  } else {
    array1Item.array2Items = array2.slice(array2Index, limit);
    array2Index += limit;
    results.push(array1Item);
  }
}

console.log(results);

Keep in mind that the order of alreadyPushed is not important (500, 600, 700, 720 are totally random)
I want the end result to look like this:

[
    {
      id: 1,
      alreadyPushed: 500,
      array2Items: {
          // 220 array2Items
      }
    },
    {
      id: 2,
      alreadyPushed: 600,
      array2Items: {
          // 120 array2Items
      }
    },
    {
      id: 3,
      alreadyPushed: 700,
      array2Items: {
          // 20 array2Items
      }
    },
];

What I'm getting:

[
  {
    id: 1,
    alreadyPushed: 500,
    array2Items: [
       // 220 array2Items
    ]
  },
  { id: 2, alreadyPushed: 600, array2Items: [] },
  { id: 3, alreadyPushed: 700, array2Items: [] }
]
about 4 years ago · Juan Pablo Isaza
2 Respuestas
Responde la pregunta

0

The problem is the slice operation. It should be array2.slice(array2Index, array2Index + limit);.

about 4 years ago · Juan Pablo Isaza Denunciar

0

The problem is in this expression:

array2.slice(array2Index, limit);

The second argument should not be the size of the slice, but the ending index of the slice.

So change to:

array2.slice(array2Index, array2Index + limit);
about 4 years ago · Juan Pablo Isaza Denunciar
Responde la pregunta
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