I'm struggling with looping through an array of arrays and returning a new array with the incremented value of the result.
Here's the concept:
let array1 = [array1, array2];
let array2 = [4000,5000,3000,6000];
let array3 = [3000, 15000, 9000, 1000];
let i = 0;
let newArray = []
while (i < array1.length) {
// how do I get the combined value in a new array so that newArray[0] = 7000, newArray[1] = 20000 etc.
}
Array1 comes from an API and is an unknown number of arrays.
This should work for any number of sub arrays. Here it is assumed that array1 contains 4 arrays.
let array2 = [4000, 5000, 3000, 6000]
let array3 = [3000, 15000, 9000, 500]
let array4 = [5000, 15000, 4000, 2000]
let array5 = [6000, 25000, 5000, 8000]
let array1 = [array2, array3, array4, array5]
const result = array1.reduce((acc, curr) => {
return acc.map((item, index) => item + curr[index])
})
console.log(result)References:
In case number of elements is dynamic then,
let array1 = [[4000, 5000, 3000, 6000], [3000, 15000, 9000, 1000, 2000, 3000], [1000], [3000, 15000, 9000, 1000, 2000, 3000, 1000, 10000]];
let index = 0;
let newArray = [];
let maxElements = Math.max(...array1.map(arr => arr.length));
let arrayLength = array1.length;
while (index < maxElements) {
let total = 0;
for (let arrayIndex = 0; arrayIndex < arrayLength; arrayIndex++) {
let element = array1[arrayIndex][index]
if (element) total += element;
}
newArray.push(total);
index++;
}
console.log(newArray)
You may need a nested loop. So basically you will iterate array1 which holds both array2 and array3 and then in newArray you will see if specific index has a value. If so then you will add value with previous one
let array2 = [4000, 5000, 3000, 6000];
let array3 = [3000, 15000, 9000, 1000];
let array1 = [array2, array3];
let i = 0;
let newArray = []
while (i < array1.length) {
for (let j = 0; j < array1[i].length; j++) {
// if index of new array is unoccupied then set a value there
if (!newArray[j]) {
newArray[j] = array1[i][j]
} else {
// if index is occupied then add with previous value
newArray[j] = newArray[j] + array1[i][j]
}
}
i++;
}
console.log(newArray)