Guide on incorporating arrays into an array using JavaScript

Is there a way to achieve the specified outcome in JavaScript? I attempted to find a method for it on MDN but was unsuccessful.

let a, b
let allNumbers = []

for (a = 10; a < 60; a = a + 10) {
    for (b = 1; b <= 3; b++) {
        allNumbers.push(a + b)
    }
}

The expected result is an array within the allNumbers array:

[[11,12,13], [21,22,23], [31,32,33], [41,42,43], [51,52,53]]

Answer №1

To efficiently solve this problem, one approach is to create a temporary array within the outer loop and populate it with elements from the inner loop. Once the inner loop completes, append the temporary array to the main array:

let x, y
let allValues = []

for (x = 5; x < 25; x += 5) {
    let someValues = [];
    for (y = 1; y <= 4; y++) {
        someValues.push(x + y)
    }
    allValues.push(someValues)
}

console.log(JSON.stringify(allValues))

Answer №2

What do you think of this code snippet?

let x, y
const numberArray = []

for (x = 10; x < 60; x = x + 10) {
    let partArray = [];
    for (y = 1; y <= 3; y++) {
        partArray.push(x + y)
    }
    numberArray.push(partArray)
}

Answer №3

To solve this problem, you must utilize a second array.

let x, y
let allValues = []

for (x = 10; x < 60; x = x + 10) {
    secondArray = [];
    for (y = 1; y <= 3; y++) {
        secondArray.push(x + y);
    }
    allValues.push(secondArray)
}
console.log(allValues);

You can also achieve the same result using a more concise approach with ES6 capabilities.

allValues = []
for (x = 10; x < 60; x = x + 10) {
    allValues.push([...Array(3)].map((_, i) => i + x + 1))
}
console.log(allValues);

Answer №4

Check out this code snippet:

const newArray = Array(5).fill(1).map((a, i) => Array(3).fill(1).map((a, j) => +`${i+1}${j+1}`));
console.log(JSON.stringify(newArray));

Answer №5

To complete this task, you will need to create a new array and add elements to it within the second loop. Once finished, append this array to the final one after the completion of the second loop.

let x, y
let finalArray = []

for (x = 5; x < 30; x = x + 5) {
  newArray = []
  for (y = 1; y <= 4; y++) {
    newArray.push(x + y)
  }
  finalArray.push(newArray)
}

console.log(finalArray)

Answer №6

In order to properly iterate, it is necessary to create a secondary array within the loop. Here is an example of how you can achieve this:

let x, y
let totalValues = []

for (x = 5; x < 30; x = x + 5) {
    var temporaryArray = [];
    for (y = 1; y <= 4; y++) {
        temporaryArray.push(x + y)
    }
    totalValues.push(temporaryArray);
}
console.log(totalValues);

Answer №7

To add a new array to the existing array called allNumbers, follow these steps:

...
let newArray = []
for (index = 1; index <= 3; index++) {
    newArray.push(existingElement + index)
}
allNumbers.push(newArray)
...

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