Sequential function calls in JavaScript

You can also pass the result of one function as a parameter to another, for example, this is how we first find the square of the number 2, and then the square of the result:

function func(num) { return num ** 2; } let res = func(func(2)); console.log(res); // shows 16

The functions, of course, do not have to be the same. Let, for example, we have a function that returns the square of a number, and a function that returns the cube of a number:

function square(num) { return num ** 2; } function cube(num) { return num ** 3; }

Let's use these functions to square the number 2, and then cube the result of this operation:

let res = cube(square(2)); console.log(res);

Suppose now we have a function that returns the square of a number, and a function that finds the sum of two numbers:

function square(num) { return num ** 2; } function sum(num1, num2) { return num1 + num2; }

Using these functions, we find the sum of the square of the number 2 and the square of the number 3:

let res = sum(square(2), square(3)); console.log(res);

Suppose you have a function that returns the square root of a number, and a function that rounds a fraction to three decimal places:

function sqrt(num) { return Math.sqrt(num); } function round(num) { return num.toFixed(3); }

Use these functions to find the square root of 2 and round it to three decimal places.

Suppose you have a function that returns the square root of a number and a function that returns the sum of three numbers:

function sqrt(num) { return Math.sqrt(num); } function sum(num1, num2, num3) { return num1 + num2 + num3; }

Using these functions, find the sum of the roots of the numbers 2, 3 and 4 and write it into the variable res.

Suppose you have a function that rounds a fraction to three decimal places:

function round(num) { return num.toFixed(3); }

Use this function to modify the previous task so that the variable res is set to a fraction rounded to 3 decimal places.

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