calculate the average of an array | for loop

Arrays are used to store multiple values in a single variable.

Each value is called an element, and each element has a numeric position in the array, known as its index.

Arrays are zero-indexed, meaning the first element is at index 0, the second at index 1, and so on.

Arrays can contain any data type, including numbers, strings, and objects.

const arr1 = [2, 4, 6]; array

arr1[0]; element at index 0 → 2

arr1[1]; element at index 1 → 4

arr1[2]; element at index 2 → 6

arr1[3]; element at index 3 → undefined index not found

Numbers are used to represent both integer and floating-point values.

Numbers are most commonly expressed in literal forms like 255 or 3.14159 ↴

let num1 = 5; → number

let num2 = 2.5; → number

let num3 = num1 + num2;

console.log(num3); returns ↴

7.5 → number

Calculate the average of an array using ↴

for loop → executes a block of code a number of times.

length property → sets or returns the number of elements in an array.

for loop repeatedly executes a block of code until a specified condition evaluates to false.

The loop runs a block of code a set number of times, defined by an initialization, a condition, and an increment.

for (let x = 0; x < 4; x++) {

console.log(x);

}

Loop variable x is initialized to 0

Condition x < 4 is checked before each iteration.

The loop will continue to run as long as x is less than 4

The loop repeatedly executes a block of code 4 times, from 0 to 3

For each iteration of the loop, the current value of x is printed to the console.

After each iteration, x is incremented by 1 x++

When x reaches 4 the condition evaluates to false, terminating the loop.

3 → printed to console

length property returns the number of elements in an array.

const arr2 = [1, 2, 3, 4, 5, 6];

arr2.length; returns ↴

6 → there are 6 elements in the array

Initialize a variable to hold the array to calculate the average.

const array1 = [2, 4, 6, 8, 10]; → user input

Define a function findAvgerage to calculate the average of an array.

function findAvgerage(arr) {}

The function takes an array of numbers as input arr and returns the average of that array.

Initialize sum to zero.

let sum = 0 sum

Loop through each element in the array.

for (let x = 0; x < arr.length; x++) {}

Add the current element arr[x] to the sum

sum += arr[x]

Return the average by dividing the sum by the number of elements in array arr

return sum / arr.length

Call the function with ↴

findAvgerage(array1);

Calculate the average of an array.

const array1 = [2, 4, 6, 8, 10];

function findAvgerage(arr) {

let sum = 0;

for (let x = 0; x < arr.length; x++) {

sum += arr[x];

}

return sum / arr.length;

}

call function

findAvgerage(array1); returns ↴

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