Exercise: JS Functions
Objective#
Your objective is to practice JavaScript functions with different parameter values and results.
Steps#
Fork and clone the Exercise Repo
Exercise 1: Print Odds Continued#
In the past, we created a selection statement inside a loop that counted from 1 to 100 and only printed out the odd numbers.
Your task is to write a function printOdds() that takes one parameter, count, and uses a loop and selection statement to count to the number passed in, printing out the odd numbers.
Declare a function named
printOddsusing declaration notation (function <name>(){...})The function should take in one parameter named
countThe function body should:
- contain a
for loopthat counts to the parameter passed in, - an
if/elsestatement that determines if the current value is odd, - and then
console.log()the odd value to the console
- contain a
BONUS: Now that you do not know exactly what number may be passed in as count, use an if statement to account for a negative count being passed in.
Exercise 2: Legal?#
Write a function that receives a name and age, and prints a greeting message to the console using the name.
Declare a function named
checkAgeusing declaration notation (function <name>(){...})The function should take in two-parameter named
userName&ageThe function body should:
- declare and initialize an
aboveSixteenlocal variable with string value:"Congrats ${userName}, you can drive!", - declare and initialize an
belowSixteenlocal variable with string value:"Sorry ${userName}, but you need to wait until you're 16.", - an
if/elsestatement that determines if theagevalue is below 16, - and then
console.log()the correct message to the console.
- declare and initialize an
BONUS: Remember that parameters are optional, and no
userNameoragevalue could be passed in. Correctly account for no parameter being passed in.
Exercise 3: Which Quadrant?#
Write a function that receives two parameters, x and y coordinates in the Cartesian plane, and prints out a message indicating if the point (x, y) lies on either the x or y axis, or what quadrant the point lies in.
For example:
- (0, 2) is on the x axis
- (1, 2) is in Quadrant 1
- (-6, 18) is in Quadrant 2
Exercise 4: What type of triangle?#
Write a function that receives three numbers that represent the lengths of a triangles three sides. If the three sides do not form a valid triangle (the sum of two sides should always be greater than the length of the third side), you should return a message indicating an invalid triangle. Otherwise, return a string indicating the type of triangle the three sides make (equilateral: all side lengths equal, isosceles: only two side lengths equal, or scalene: all different side lengths).
For example:
- Sides 1, 2, 2 make an isosceles triangle
- Sides 1, 1, 2 make an invalid triangle
Exercise 5: Data Plan Status#
Write a function that will display feedback on cell phone data usage. Cell phone plans for this particular company give you a certain amount of data every 30 days which must be used or they are lost (no rollover). We want to track the average amount of data used per day and inform the user if they are using too much data or can afford to use more.
Write a function that accepts the following parameters:
planLimit: amount of data in the plan per 30 day periodday: the current day in the 30 day periodusage: the total amount of data used so far
The function should compute whether the user is over, under, or right on the average daily usage under the plan. It should also inform them of how much data is left and how much, on average, they can use per day for the rest of the month. If they’ve run out of data, it should inform them of that too.
For example, if the user enters planLimit = 100, day = 15, and usage = 56, your program should print
out something similar to the following.