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Sum is to be calculated for the numbers in between the array's max and min value JavaScript
We are required to write a function, say sumBetween() that takes in an array [a,b] of two elements and returns the sum of all the elements between a and b including a and b.
For example −
[4, 7] = 4+5+6+7 = 22 [10, 6] = 10+9+8+7+6 = 40
Let’s write the code for this function −
Example
const arr = [10, 60];
const sumUpto = (n) => (n*(n+1))/2;
const sumBetween = (array) => {
if(array.length !== 2){
return -1;
}
const [a, b] = array;
return sumUpto(Math.max(a, b)) - sumUpto(Math.min(a, b)) + Math.min(a,b);
};
console.log(sumBetween(arr));
console.log(sumBetween([4, 9]));Output
The output in the console will be −
1785 39
Updated on: 20-Aug-2020
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