A method for combining multiple arrays into a single array within a For loop

Question

A method for combining multiple arrays into a single array within a For loop

I am trying to combine multiple arrays of objects into a single array.

Here is an example with a transaction array that contains two different arrays:

transaction:

0:(3) [{…}, {…}, {…}]
1:(2) [{…}, {…}]

I would like the combined result to look like this:

transaction:

0:(5) [{…}, {…}, {…},{…}, {…}]

I am currently using a for loop to push arrays inside the transaction array, but I'm unsure how to use the concat operation within the loop.

Below is the for loop I am using to push objects into the transaction array:

for (var j = 0; j < $scope.allRecent.length; j++)
{
    if (uniqueDates[i].dates == $scope.formatDate($scope.allRecent[j].date))
    {
        tempObj.transaction.push($scope.allRecent[j].transaction)
    }
}

javascript angularjs

Answer 1

Answer №1

To combine all the arrays, you can simply concatenate them together using the following method:

var array = [[{a:1},{b:1},{c:1}], [{a:2},{b:1}]];
var result = [];
for(var i = 0; i < array.length; i++){
    result = result.concat(array[i]);
}
console.log(result);

Answer 2

To combine all the arrays, you can simply concatenate them together using the following method:

var array = [[{a:1},{b:1},{c:1}], [{a:2},{b:1}]];
var result = [];
for(var i = 0; i < array.length; i++){
    result = result.concat(array[i]);
}
console.log(result);

Answer 3

Answer №2

In this scenario, if you want to add the value "abc" to subArray1, which is part of the array variable defined as

array = [[subArray1], [subArray2]]

, you should execute array[0].push("abc"). This is because subArray1 is located at index 0 within the array.

Answer 4

In this scenario, if you want to add the value "abc" to subArray1, which is part of the array variable defined as

array = [[subArray1], [subArray2]]

, you should execute array[0].push("abc"). This is because subArray1 is located at index 0 within the array.

Answer 5

Answer №3

To efficiently combine multiple arrays, utilize the Array.reduce() method in conjunction with the spread operator

Explore more on Array.reduce() here

const arr1 = [1, 2, 3, 4];
const arr2 = [5, 6, 7, 8];
const arr3 = [9, 10];
const combinedArr = [arr1, arr2, arr3];
console.log(combinedArr);

const customReducer = (accumulator, currentValue) => [...accumulator, ...currentValue];
console.log(combinedArr.reduce(customReducer));

Answer 6

To efficiently combine multiple arrays, utilize the Array.reduce() method in conjunction with the spread operator

Explore more on Array.reduce() here

const arr1 = [1, 2, 3, 4];
const arr2 = [5, 6, 7, 8];
const arr3 = [9, 10];
const combinedArr = [arr1, arr2, arr3];
console.log(combinedArr);

const customReducer = (accumulator, currentValue) => [...accumulator, ...currentValue];
console.log(combinedArr.reduce(customReducer));

A method for combining multiple arrays into a single array within a For loop

Answer №1

Answer №2

Answer №3

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