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Write a javascript program to find average of numbers in an array using spread operator

How can we do find average of an array using spread operator?

I tried using different ways but didn’t got what I expected.

I actually tried this way but didn’t got any result:

    let arr = [1, 2, 3, 4, 5];
    console.log(...arr);
    let sum = (...arr) => arr.reduce((a, b) => a + b);
    console.log(sum);

    avg = sum / (arr.length);
    console.log(avg);
Tags:

5

Answers


  1. 0

    Actually your sum is a function, not a numeric value.

    Please try:

    let sum = arr.reduce((a, b) => a + b);
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  2. 0

    You made the function to get the sum:

    let sum = (...arr) => arr.reduce((a, b) => a + b);

    But you didn’t actually apply it yet, so there is no result. To apply it:

    let totalSum = sum(...arr);

    Then, to calculate the average:

    let avg = totalSum / arr.length;

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  3. 0

    You can find the average of an array using the spread operator and the reduce function. Here’s a concise example:

    let arr = [1, 2, 3, 4, 5];
let sum = arr.reduce((a, b) => a + b, 0);
let avg = sum / arr.length;
console.log(avg);

    In your code, the spread operator (...arr) is not needed for calculating the sum. The correct usage is demonstrated in the example above.

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  4. 0

    You are never calling your arrow function and you cannot divide a function by a number. Call your function to get a numeric value:

    const arr = [1, 2, 3, 4, 5];
const sum = ((...arr) => arr.reduce((a, b) => a + b, 0))(...arr);
// ...

    Since the function is immediately invoked, you might as well just drop it:

    const arr = [1, 2, 3, 4, 5];
const sum = arr.reduce((a, b) => a + b, 0);
// ...
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  5. 0

    You can try this:

    function findAverage(...numbers) {
    // the formula for getting average is (sum/total)
    let sum = 0;
    numbers.forEach(number => {
        sum += number;
    });
    const total = numbers.length;
    const average = sum / total;
    return average;
}

let arr = [1, 2, 3, 4, 5];
findAverage(...arr); // returns 3
// or
findAverage(1,2,3,4,5) // returns 3

    Hope this helps.

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