Convert temperature

Write a function that converts Kelvin to Celsius & Fahrenheit.

Temperature conversion is the process of changing the value of temperature from one unit to another.

Temperature can be measured on scales like Kelvin, Celsius, and Fahrenheit.

Celsius scale → freezing point and the boiling point of water is 0 °C and 100 °C respectively.

Fahrenheit scale → freezing point and the boiling point of water is 32 °F and 212 °F respectively.

Kelvin scale → freezing point and the boiling point of water is 273.15 K and 373.15 K respectively.

Example ...

Enter a number to represent temperature in K

273.15 K temperature in Kelvin

converts to ...

0 °C temperature in Celcius

32 °F temperature in Fahrenheit

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

Destructuring

The destructuring syntax is a JavaScript syntax that makes it possible to unpack values from arrays, or properties from objects, into distinct variables.

const arr2 = ["Hello", "World"]; → array

const [a, b] = arr2;

console.log(a); returns ↴

"Hello" → first element in array

console.log(b); returns ↴

"World" → second element in array

Array destructuring assigns the first and second elements of the array directly to a and b, respectively. This eliminates the need for additional indexing, making the code cleaner and more intuitive.

Temperature conversion formulas

Kelvin to Celsius ↴

Celsius = Kelvin - 273.15

Kelvin to Fahrenheit ↴

Fahrenheit = (Kelvin - 273.15) × 9 ⁄ 5 + 32

Initialize a variable to hold the number representing the temperature in Kelvin.

const tempK = 373.15; → user input

Define a function convertTempK to convert temperature.

function convertTempK(kelvin) {}

The function takes a number as input degK and using the conversion formulas, converts it to Celsius and Fahrenheit.

Convert degK to Celsius using formula ...

const degC = degK - 273.15 degC

Convert degK to Fahrenheit using formula ...

const degF = (degK - 273.15) * 9 / 5 + 32 degF

Use destructuring to assign the returned values directly to degC and degF variables.

Call the function and destructure the results.

const [degC, degF ] = convertTempK(tempK)

degC returns → 100 Celsius value

degF returns → 212 Fahrenheit value

The results from the function may then be manipulated, for example, to display results to 2 decimal places.

Convert Kelvin to Celsius & Fahrenheit.

const tempK = 373.15;

function convertTempK(degK) {

const degC = degK - 273.15;

const degF = (degK - 273.15) * 9 / 5 + 32;

return [degC, degF];

}

call function

const [degC, degF ] = convertTempK(tempK);

degC; returns → 100

degF; returns → 212

Alternative - create an array to hold the converted temperatures ↴

Convert Kelvin to Celsius & Fahrenheit.

const tempK = 373.15;

function convertTempK(kelvin) {

const arr = [];

arr[0] = kelvin - 273.15;

arr[1] = (kelvin - 273.15) * 9 / 5 + 32;

return arr;

}

call function

convertTempK(tempK); returns ↴

[100, 212] → array contains both values

convertTempK(tempK)[0]; returns ↴

100 → first index of array [0]

convertTempK(tempK)[1]; returns ↴

212 → second index of array [1]

Convert temperature

Enter temperature in Kelvin
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