I am trying to add all array elements with basic for loop for some reason, my variable 'result' return NaN.
let array = [1, 2, 3, 4, 5];
let result = 0;
const arraySum = (arr) => {
for (let i = 0; i <= arr.length; i++) {
result = arr[i] + result
}
console.log(result)
}
arraySum(array)Please use basic looping to answer, I tried .reduce method but want to use basic loops Thank you
Your condition of i <= arr.length should be using i < arr.length
The length of the array is 5 but the index of the last number is 4, so you don't want <= there.
let array = [1, 2, 3, 4, 5];
let result = 0;
const arraySum = (arr) => {
for (let i = 0; i < arr.length; i++) {
result = arr[i] + result
}
console.log(result)
}
arraySum(array)Length start at 1, so you need to set < operator in your loop :
let array = [1, 2, 3, 4, 5];
let result = 0;
const arraySum = (arr) => {
for (let i = 0; i < arr.length; i++) {
result = arr[i] + result
console.log(result)
}
console.log("result = ", result)
}
arraySum(array)The reason for this problem is that the array has a length of 5 and the last index is 4. When the loop is at index = 5 there is no element at position 5. The result will therefore be undefined. To avoid this problem, the for loop should be like this:
for (let i = 0; i < arr.length; i++)
or
for(const i in arr)
You put '<=' in the for loop but you must use just '<'. if array = [1,2,3] then length = 3 but array index goes from 0 to 2 not 3
you could try, if simple enough:
let array = [1, 2, 3, 4, 5];
let result = 0;
arraySum = (arr) => {
for (let i = 0; i < arr.length; i++) {
result += arr[i]
}
console.log(result)
}
arraySum(array)the "<=" shoud be placed by "<"
let array = [1, 2, 3, 4, 5];
let result = 0;
const arraySum = (arr) => {
for (let i = 0; i <= array.length; i++) {
result += array[i];
}
console.log(result);
};
arraySum(array);
