Divide an array into smaller arrays

Question

Divide an array into smaller arrays

If I create a function named sliceArrayIntoGroups that takes an array and a size as parameters, how can I divide the input array into smaller arrays of the specified size?

function sliceArrayIntoGroups(arr, size) {
  var slicedArray = arr.slice(0, size);

  return slicedArray;
}

For example, if I call this function with ["a", "b", "c", "d"] and 2 as arguments:

sliceArrayIntoGroups(["a", "b", "c", "d"], 2);

The expected output is:

[["a","b"],["c","d"]]

However, I am unsure how to store the remainder of the original array after it has been sliced.

Any assistance on this matter would be greatly appreciated.

javascript arrays

Answer 1

Answer №1

A method to divide an array into groups using a standard while loop and a custom step parameter:

function splitArrayIntoGroups(arr, size) {
  var step = 0, splitArr = [], length = arr.length;
  while (step < length) {
    splitArr.push(arr.slice(step, step += size));
  }
  return splitArr;
}

console.log(splitArrayIntoGroups(["apple", "banana", "cherry", "date"], 2));
console.log(splitArrayIntoGroups(["apple", "banana", "cherry", "date", "eggplant", "fig"], 2));
console.log(splitArrayIntoGroups(["apple", "banana", "cherry", "date", "eggplant", "fig"], 3));

The step parameter determines the offset for each extracted slice.

Answer 2

A method to divide an array into groups using a standard while loop and a custom step parameter:

function splitArrayIntoGroups(arr, size) {
  var step = 0, splitArr = [], length = arr.length;
  while (step < length) {
    splitArr.push(arr.slice(step, step += size));
  }
  return splitArr;
}

console.log(splitArrayIntoGroups(["apple", "banana", "cherry", "date"], 2));
console.log(splitArrayIntoGroups(["apple", "banana", "cherry", "date", "eggplant", "fig"], 2));
console.log(splitArrayIntoGroups(["apple", "banana", "cherry", "date", "eggplant", "fig"], 3));

The step parameter determines the offset for each extracted slice.

Answer 3

Answer №2

Here is a handy little recursive function that can help you split an array into groups of a specified size. It works by slicing off n elements from the start of the array and then calling itself with the remaining elements.

function sliceArrayIntoGroups(arr, size) {
  if (arr.length === 0) { return arr; }
  return [ arr.slice(0, size), ...sliceArrayIntoGroups(arr.slice(size), size) ];
}

console.log(sliceArrayIntoGroups([1,2,3,4,5], 2));
console.log(sliceArrayIntoGroups([1,2,3,4,5], 3));
console.log(sliceArrayIntoGroups([1,2,3,4,5], 10));

Answer 4

Here is a handy little recursive function that can help you split an array into groups of a specified size. It works by slicing off n elements from the start of the array and then calling itself with the remaining elements.

function sliceArrayIntoGroups(arr, size) {
  if (arr.length === 0) { return arr; }
  return [ arr.slice(0, size), ...sliceArrayIntoGroups(arr.slice(size), size) ];
}

console.log(sliceArrayIntoGroups([1,2,3,4,5], 2));
console.log(sliceArrayIntoGroups([1,2,3,4,5], 3));
console.log(sliceArrayIntoGroups([1,2,3,4,5], 10));

Answer 5

Answer №3

Check out this code snippet that splits an array into two pieces and then combines them into one:

function splitArray(arr, size) {
  if (size >= arr.length || size <= 0) { return arr; }
  return [arr.slice(0, size), arr.slice(size)];
}
console.log(splitArray(["apple", "banana", "cherry", "date"], 2));

Answer 6

Check out this code snippet that splits an array into two pieces and then combines them into one:

function splitArray(arr, size) {
  if (size >= arr.length || size <= 0) { return arr; }
  return [arr.slice(0, size), arr.slice(size)];
}
console.log(splitArray(["apple", "banana", "cherry", "date"], 2));

Answer 7

Answer №4

Give this a try:

 function divideArrayIntoGroups(arr, size) {
   var result = [];

   while (arr.length > 0) {
     result.push(arr.splice(0, size));
   }

   return result;
 }


 console.log(divideArrayIntoGroups(["a", "b", "c", "d", "e", "f"], 3));
 console.log(divideArrayIntoGroups(["a", "b", "c", "d"], 2));

function divideArrayIntoGroups(arr, size) {
  var result = [];

  while (arr.length > 0) {
    result.push(arr.splice(0, size));
  }

  return result;
}

This function will split the array into smaller groups based on the value of the size parameter, so

divideArrayIntoGroups(["a", "b", "c", "d", "e", "f"], 3);

will produce the following output:

[["a", "b", "c"], ["d", "e", "f"]]

Answer 8

Give this a try:

 function divideArrayIntoGroups(arr, size) {
   var result = [];

   while (arr.length > 0) {
     result.push(arr.splice(0, size));
   }

   return result;
 }


 console.log(divideArrayIntoGroups(["a", "b", "c", "d", "e", "f"], 3));
 console.log(divideArrayIntoGroups(["a", "b", "c", "d"], 2));

function divideArrayIntoGroups(arr, size) {
  var result = [];

  while (arr.length > 0) {
    result.push(arr.splice(0, size));
  }

  return result;
}

This function will split the array into smaller groups based on the value of the size parameter, so

divideArrayIntoGroups(["a", "b", "c", "d", "e", "f"], 3);

will produce the following output:

[["a", "b", "c"], ["d", "e", "f"]]

Answer 9

Answer №5

The slice() method in JavaScript is a useful tool for extracting specific elements from an array and creating a new array with those elements. By utilizing a for loop, we can segment the original array into smaller arrays of a specified size and store them in a larger array called arrGroup.

function divideArrayIntoGroups(originalArr, groupSize) {
  let arrGroup =[];
  for (let i=0; i<originalArr.length; i+=groupSize) {
    let smallArray = originalArr.slice(i,i+groupSize); // Create a smaller array of desired size
    arrGroup.push(smallArray);
  }
  return arrGroup;
}

Answer 10

The slice() method in JavaScript is a useful tool for extracting specific elements from an array and creating a new array with those elements. By utilizing a for loop, we can segment the original array into smaller arrays of a specified size and store them in a larger array called arrGroup.

function divideArrayIntoGroups(originalArr, groupSize) {
  let arrGroup =[];
  for (let i=0; i<originalArr.length; i+=groupSize) {
    let smallArray = originalArr.slice(i,i+groupSize); // Create a smaller array of desired size
    arrGroup.push(smallArray);
  }
  return arrGroup;
}

Answer 11

Answer №6

Minimize:

let numbers = [1,2,3,4,5,6,7,8,9];
let chunkArray = function(array, size) {
    let temp;
    return array.reduce(function(carry, item, index) {

        // Check if we're at a chunk point: index % size == 0
        if (!(index % size)) { 

            // If temp currently holds items, push it onto carry
            if (temp && temp.length) { 
                carry.push(temp); 
            }

            // Reset temp to an empty array
            temp = []; 
        }

        // Push the current item onto temp
        temp.push(item);

        // If this is the last item in the array, push temp onto carry
        index === array.length - 1 && carry.push(temp);

        return carry;
    }, []);
};

chunkArray(numbers,5);

Answer 12

Minimize:

let numbers = [1,2,3,4,5,6,7,8,9];
let chunkArray = function(array, size) {
    let temp;
    return array.reduce(function(carry, item, index) {

        // Check if we're at a chunk point: index % size == 0
        if (!(index % size)) { 

            // If temp currently holds items, push it onto carry
            if (temp && temp.length) { 
                carry.push(temp); 
            }

            // Reset temp to an empty array
            temp = []; 
        }

        // Push the current item onto temp
        temp.push(item);

        // If this is the last item in the array, push temp onto carry
        index === array.length - 1 && carry.push(temp);

        return carry;
    }, []);
};

chunkArray(numbers,5);

Divide an array into smaller arrays

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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