julzbond / js-functions

Javascript Function Exercises

#Javascript Function Exercises

Create 20 functions by following the comments in functions.js. Write all of functions below in functions.js

Getting Started

1. Clone this repository and change your current working directory to this repository
2. Install all dependencies by running the command: npm install
3. Your work will be done in the file named: functions.js
4. Run your tests with the command: npm test
5. Your tests are broken, fix them!

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numberToString(Number)

Converts a number a string.

Parameters

n: number

Returns: string, the number as a string

increase(n)

Adds one to a given number

Parameters

n: number

Returns: number

decrease(n)

Subtracts one from a given number

Parameters

n: number

Returns: number

add(x, y)

Adds two numbers.

Parameters

x: number

y: number

Returns: number, the sum

subtract(x, y)

Subtracts the second number from the first.

Parameters

x: number

y: number

Returns: number, the difference

multiply(x, y)

Multiplies two numbers.

Parameters

x: number

y: number

Returns: number, the product

divide(x, y)

Divides the first number by the second.

Parameters

x: number

y: number

Returns: number, the quotient

square(x)

Multiplies a number by itself.

Parameters

x,: number, number to be squared

Returns: number, squared

calculate(operation, x, y)

Prints out the equation: (i.e.) "1 + 5 = 6" or "8 / 2 = 4". Returns the result.

Parameters

operation: string, "add", "subtract", "multiply", or "divide"

x: number

y: number

Returns: number, the result

isGreaterThan(a, b)

Returns true if a is greater than b

Parameters

a: number

b: number

Returns: boolean, a is larger than b

isLessThan(a, b)

Returns true if a is less than b

Parameters

a: number

b: number

Returns: boolean, a is smaller than b

areEqual(a, b)

Returns true if a and b are equal

Parameters

a: number

b: number

Returns: boolean, the numbers are equal

minimum(x, y)

Returns the smallest value of two numbers.

Parameters

a: number

b: number

Returns: number, the smallest number

maximum(x, y)

Returns the largest value of two numbers.

Parameters

a: number

b: number

Returns: number, the largest number

isEven(n)

Returns true if n is even.

Parameters

n: number

Returns: boolean, the number is even

isOdd(n)

Returns true if n is odd.

Parameters

n: number

Returns: boolean, the number is odd

letterGrade(score, total)

Returns a letter grade. "A": 90-100% "B": 80-89% "C": 70-79% "D": 60-69% "F": 0-59%

Parameters

score: number

total: number, maximum possible score

Returns: string, the score represented as a letter grade

incrementReviews(restaurant)

Checks if a restaurant object has a reviews field. If it does, increase it by 1. If it does not, set its reviews field to 1.

Parameters

restaurant: object, represents a restaurant

combine(word1, word2)

Joins two strings with a space.

Parameters

word1: string

word2: string

Returns: string, joined the words joined with a space

createCircle(radius)

Returns a circle object with the properties circumferance and area.

Use Math.PI for the value π.

Parameters

radius: number

Returns: object, circle

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After all your tests pass, practice calling functions by following the comments in script.js.