Is it possible to iterate and add an array to another array using a loop?

Question

Is it possible to iterate and add an array to another array using a loop?

Looking for a more efficient way to organize my code using loops

let tmpD = [];
let tmpS = [[], [], []];

for(let i = 0; i < tmpD.length; i++) {
  signed = doctors.doc(tmpD[i].key).collection('schedule').get();
  signed.then(function(ss){
    ss.forEach(function(schedule){
      tmpS[i].push(schedule.data());
    });
    console.log(tmpS[i]);
  });
}

I attempted to use a for loop above the first signed statement and push data accordingly, but ended up with all data in a single array. I also tried pushing the data to tmpS[i] directly, resulting in an error.

javascript arrays

Answer 1

Answer №1

To efficiently manage the data, one approach is to create a 2D array consisting of variables like tmpS0, tmpS1, and so on. These arrays can then be updated based on their respective indices:

let tmpD = [];
let tmpS0 = [];
let tmpS1 = [];
let tmpS2 = [];

let tmps = [tmpS0, tmpS1, tmpS2];

tmpD.forEach(({ key }, i) => {
  const signed = doctors.doc(key).collection('schedule').get();
  signed.then(function(ss) {
    ss.forEach(function(schedule) {
      tmps[i].push(schedule.data());
    });
    console.log(tmps[i])
  });
})

An Update has been made:

If there is a need for dynamic variables, you can simply work with a single tmpS array and continue adding data to it based on the index from the tmpD array:

let tmpD = [];
let tmpS = []; // This acts as a 2D array

tmpD.forEach(({ key }, i) => {
  const signed = doctors.doc(key).collection('schedule').get();
  signed.then(function(ss) {
    tmpS[i] = tmpS[i] || []; // Initializing the inner arrays if needed

    ss.forEach(function(schedule) {
      tmpS[i].push(schedule.data());
    });

    console.log(tmpS[i])
  });
})

// The tmpS array will have inner arrays equivalent to the length of tmpD
console.log(tmpS)

Answer 2

To efficiently manage the data, one approach is to create a 2D array consisting of variables like tmpS0, tmpS1, and so on. These arrays can then be updated based on their respective indices:

let tmpD = [];
let tmpS0 = [];
let tmpS1 = [];
let tmpS2 = [];

let tmps = [tmpS0, tmpS1, tmpS2];

tmpD.forEach(({ key }, i) => {
  const signed = doctors.doc(key).collection('schedule').get();
  signed.then(function(ss) {
    ss.forEach(function(schedule) {
      tmps[i].push(schedule.data());
    });
    console.log(tmps[i])
  });
})

An Update has been made:

If there is a need for dynamic variables, you can simply work with a single tmpS array and continue adding data to it based on the index from the tmpD array:

let tmpD = [];
let tmpS = []; // This acts as a 2D array

tmpD.forEach(({ key }, i) => {
  const signed = doctors.doc(key).collection('schedule').get();
  signed.then(function(ss) {
    tmpS[i] = tmpS[i] || []; // Initializing the inner arrays if needed

    ss.forEach(function(schedule) {
      tmpS[i].push(schedule.data());
    });

    console.log(tmpS[i])
  });
})

// The tmpS array will have inner arrays equivalent to the length of tmpD
console.log(tmpS)

Is it possible to iterate and add an array to another array using a loop?

Answer №1

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