Arrange certain items from one array into a different array

Question

Arrange certain items from one array into a different array

As part of a project, I am required to organize this array that includes both strings and numbers. The strings act as indicators for which array the number should be stored in.

let myArray = [22, 'talk', 31, 'perfo', 35, 'init', 42, 'talk']
let talk = []
let perfo = []
let init = []

for (let i = 0; i < myArray.length; i + 2) {
    if (myArray[i + 1] == 'talk') {
        talk.push(myArray[i])
    } else if (myArray[i + 1] == 'perfo') {
        perfo.push(myArray[i])
    } else if (myArray[i + 1] == 'init') {
        init.push(myArray[i])
    } else {}
}

The expected output should be:

talk [22, 42], perfo [35], init [42]

However, it appears that the for loop is not being executed properly.

javascript arrays sorting for-loop

Answer 1

Answer №1

An object differs from an array in that it uses strings instead of numbers as indexes, allowing us to reconstruct the initial array using an object.

let myArray = [22, 'talk', 31, 'perfo', 35, 'init', 42, 'talk']

let arrays = {}
for (let i = 0; i < myArray.length; i+=2) {
  const arrayName = myArray[i+1];
  
  if (arrays[arrayName]) {
    arrays[arrayName].push(myArray[i])
  } else {
    arrays[arrayName] = [myArray[i]]
  }
}

console.log(arrays);
// [object Object] {
//  init: [35],
//  perfo: [31],
//  talk: [22, 42]
// }

Answer 2

An object differs from an array in that it uses strings instead of numbers as indexes, allowing us to reconstruct the initial array using an object.

let myArray = [22, 'talk', 31, 'perfo', 35, 'init', 42, 'talk']

let arrays = {}
for (let i = 0; i < myArray.length; i+=2) {
  const arrayName = myArray[i+1];
  
  if (arrays[arrayName]) {
    arrays[arrayName].push(myArray[i])
  } else {
    arrays[arrayName] = [myArray[i]]
  }
}

console.log(arrays);
// [object Object] {
//  init: [35],
//  perfo: [31],
//  talk: [22, 42]
// }

Answer 3

Answer №2

If you have an object containing arrays and want to push values into it, you can follow this approach.

let data = [22, 'talk', 31, 'perfo', 35, 'init', 42, 'talk'],
    talk = [],
    perfo = [],
    init = [],
    temp = { talk, perfo, init },
    i = 0;

while (i < data.length) {
    let [value, key] = data.slice(i, i += 2);
    temp[key].push(value);
}

console.log(talk);
console.log(perfo);
console.log(init);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 4

If you have an object containing arrays and want to push values into it, you can follow this approach.

let data = [22, 'talk', 31, 'perfo', 35, 'init', 42, 'talk'],
    talk = [],
    perfo = [],
    init = [],
    temp = { talk, perfo, init },
    i = 0;

while (i < data.length) {
    let [value, key] = data.slice(i, i += 2);
    temp[key].push(value);
}

console.log(talk);
console.log(perfo);
console.log(init);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Arrange certain items from one array into a different array

Answer №1

Answer №2

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