Here is an array I have: [2, 1, 2, 1, 1, 1, 1, 1]
I am looking for a way to create new arrays within the original array when the sum of values exceeds four.
The desired result should look like this: [[2,1],[2,1,1],[1,1,1]]
Here is an array I have: [2, 1, 2, 1, 1, 1, 1, 1]
I am looking for a way to create new arrays within the original array when the sum of values exceeds four.
The desired result should look like this: [[2,1],[2,1,1],[1,1,1]]
If you want to perform a task that involves adding values from arrays, you can utilize the Array#reduce method. This method allows you to add values of the last inserted array as well as the entire result array.
The key part of the algorithm is encapsulated in this line of code:
!i || r[r.length - 1].reduce(add, 0) + a > 4 ?
r.push([a]) :
r[r.length - 1].push(a);
Here, a condition is checked: if the index i is zero or if the sum of the last array of the result combined with the current item exceeds 4, a new array containing the current value is created. Otherwise, the element is simply added to the last array.
var data = [2, 1, 2, 1, 1, 1, 1, 1],
add = function (a, b) { return a + b; },
result = data.reduce(function (r, a, i) {
!i || r[r.length - 1].reduce(add, 0) + a > 4 ? r.push([a]) : r[r.length - 1].push(a);
return r;
}, []);
console.log(result);If you want to create a new array by looping through the existing one and pushing elements into it based on a certain condition, you can follow this approach:
var originalArray = [3, 1, 2, 2, 1, 1, 2, 2];
var newArray = [];
var tempArray = [];
for (var index = 0; index < originalArray.length; index++) {
if (calculateSum(tempArray) + originalArray[index] > 5) {
newArray.push(tempArray);
tempArray = [];
}
tempArray.push(originalArray[index]);
if (index == originalArray.length - 1) newArray.push(tempArray);
}
function calculateSum(array) {
return array.reduce(sum, 0);
function sum(a, b) {
return a + b;
}
}
Check out the live demo here: https://jsfiddle.net/e762tuhd/
To simplify the process...
let numbers = [2, 1, 2, 1, 1, 1, 1, 1];
let temporary=[];
let finalOutput=[];
let totalSum=0;
for(let index=0; index<numbers.length; index++){
totalSum += numbers[index];
if(totalSum<=4){
temporary.push(numbers[index]);
}else{
finalOutput.push(temporary);
totalSum = numbers[index];
temporary=[numbers[index]];
}
}
finalOutput.push(temporary);
console.log(finalOutput);
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