Javascript - Functions 2
Anonymous functions
Functions as arguments
ForEach
Filter & Map
Preparation
Exercises A
📝 Exercise 1
Write a function that takes three numbers as parameter, sums the integers and returns the result.
The function should be defined as an arrow function
The functions should return the result
console.log(someFunctionName(10, 20, 5)); // 35📝 Exercise 2
Write a function that takes three numbers as parameter, identifies the largest number and returns the result.
The function should be defined as an arrow function
The functions should not return anything (void function) - it should print the result to the HTML page using document.write()
📝 Exercise 3
Write a function that receives two parameters. An array of numbers and a number.
The function will return true if the number is higher than the array average
The function will return false if the number is lower than the array average
The function should be defined as an arrow function
📝 Exercise 4 (Optional advanced)
Write a function that takes an array of numbers as parameter, identifies the largest number and returns the result.
The function should be defined as an arrow function
The functions should not return anything (void function) - it should print the result to the HTML page using document.write()
📝 Exercise 5 (Optional advanced)
Write a function that accepts a list of country names as input and returns the longest country name.
The function should be defined as an arrow function
Sample data :
["Australia", "Germany", "United States of America"]Expected output : "United States of America"
📝 Exercise 6 (Optional advanced)
Write a function that accepts a list of country names as input and returns the country with the most amount of words in the name.
The function should be defined as an arrow function
Sample data :
["Australia", "Germany", "United States of America","Denmark","The United Kingdom of Great Britain and Northern Ireland","Independent and Sovereign Republic of Kiribati "]Expected output : "The United Kingdom of Great Britain and Northern Ireland"
Exercises B
📝Exercise 1
Write a function that iterates through an array of strings and returns the average amount of letters pr. word
The function should use the foreach syntax loop
Remember that a string also has a .length property
const strings = ["dog","cat","lazy","fox","jumps","over","the","fence","javascript","tobias rahim"]📝Exercise 2
Write a function that filters all names above the length of 5 letters.
The function should use the filter syntax
const firstNames = [
"Alice",
"Bob",
"Charlie",
"David",
"Eve",
"Frank",
"Grace",
"Hannah",
"Isabel",
"Jack",
"Katherine",
"Liam",
"Mia",
"Noah",
"Olivia",
"Sophia",
"Thomas",
"Victoria",
"William",
];📝Exercise 3
Write a function takes an array of numbers as parameter. The function filters away all numbers that are even and returns an array only of uneven numbers
The function should use the filter syntax
const numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];📝 Exercise 4
Write a function that converts an array of numbers representing hours to their corresponding amount of seconds.
The function should use the map syntax
const hours = [2,4,12,1,0.5,3,4,5,10]📝Exercise 5 (advanced optional)
Write a function with two parameters, an array and a letter.
The function returns an array with all the words starting with the letter put in the function argument
const words = ["apple", "banana", "cherry", "agøøørk","date", "fig", "grape", "kiwi", "lemon", "mango", "orange"];
filterLetters(words, "a"); //returns [apple, agøøørk]📝 Exercise 6 (advanced optional)
Write a function that takes an array of integers as paramter and removes all unique numbers. The function returns an array with only 1 entry of each unique number.
const numbers = [1, 2, 3, 2, 4, 5, 6, 3, 7, 8, 9, 1, 10];📝Exercise 7 (advanced optional)
Write a function that receives an array of cpr numbers.
The function will filter all cpr numbers that do not follow the following rules of a cpr number:
It should be 11 characters long
The first 2 indices cannot be higher than 31
The next 2 indicies cannot be higher than 12
The next character should be a "-"
const strings = [
"121256-7890",
"987654-3210",
"1004890123",
"112233-44552",
"111244-556611",
"150690-3152asd",
];Last updated