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JavaScript Test 2

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Asabeneh edited this page May 13, 2019 · 10 revisions
  1. Write a function which count the number of occurrence of words in a paragraph or a sentence.The function countWords takes a paragraph and two words as parameters. It compare which word is most frequently occurred in the paragraph.
const paragraph = 'I love teaching. If you do not love teaching what else can you love. I love JavaScript if you do not love something which can give life to your application what else can you love.';
console.log(countWords(paragraph,'love', 'you'));
The word love more frequently occurred than you.
  1. Write a function which takes an array parameter and returns an array of the data types of each item:
const arr = ['Asabeneh', 100, true, null, undefined, {job:'teaching'}];
console.log(checkDatatTypes(arr));
["string", "number", "boolean", "object", "undefined", "object"]
const mixedData = ["John", 25, "David", 30, "Sara", 22];
console.log(checkDatatTypes(mixedData));
["string","number","string","number","string","number"];
  1. Create a function which filter ages greater than 18.
const ages = [35, 30, 17, 18, 15, 22, 16, 20];
console.log(agesGreaterEighteen(ages));
[35, 30, 22, , 20];
  1. Write a function which calculate the average age of the group.
console.log(averageAge(ages));
22
  1. Write a function named shuffle, it takes an array parameter and it returns a shuffled array.
shuffle([1,2,3,4,5];
[3,1,5,2,4]
  1. Write a function which can generate a random Finnish car code.
console.log(genCarPlateNum())
AFG-205
console.log(genCarPlateNum())
JCB-586
  1. The following shopping cart has four products. Create an addProduct, removeProduct ,editProduct , removeAll functions to modify the shopping cart.
const shoppingCart = ['Milk','Coffee','Tea', 'Honey'];

addProduct( "Meat");
["Milk", "Coffee", "Tea", "Honey", "Meat"]

editProduct(3, "Sugar" );
["Milk", "Coffee", "Tea", "Sugar", "Meat"]

removeProduct(0);
["Coffee", "Tea", "Sugar", "Meat"]
removeProduct(3);
["Coffee", "Tea", "Sugar"]
  1. The following todoList has three tasks. Create an addTask, removeTask, editTask, toggleTask, toggleAll, removeAll functions to modify the todoList.
const todoList = [
{
	task:'Prepare JS Test',
	time:'4/3/2019 8:30',
	completed:true
	
},
{
	task:'Give JS Test',
	time:'4/3/2019 10:00',
	completed:false
	
},
{
	task:'Assess Test Result',
	time:'4/3/2019 1:00',
	completed:false
	
}]
  1. Write a function which check if items of an array are unique?
const arrOne = [1, 4, 6, 2, 1];
console.log(checkUniqueness(arrOne));
false
const arrTwo = [1, 4, 6, 2, 3]
console.log(checkUniqueness(arrTwo));
true
  1. Write a function which filter users who has scoresGreaterThan85, Write a function which addUser to the user array only if the user does not exist. Write a function which addUserSkill which can add skill to a user only if the user exist. Write a function which editUser if the user exist in the users array.
const users = [
{
	name:'Brook', 
	scores:75,
	skills:['HTM', 'CSS', 'JS'],
	age:16
},
{
	name:'Alex', 
	scores:80,
	skills:['HTM', 'CSS', 'JS'],
	age:18
}, 
{
	name:'David', 
	scores:75,
	skills:['HTM', 'CSS'],
	age:22
}, 
{
	name:'John', 
	scores:85,
	skills:['HTM'],
	age:25
},
{
	name:'Sara',
	scores:95,
	skills:['HTM', 'CSS', 'JS'],
	age: 26
},
{
	name:'Martha', 
	scores:80,
	skills:['HTM', 'CSS', 'JS'],
	age:18
},
{
	name:'Thomas',
	scores:90,
	skills:['HTM', 'CSS', 'JS'],
	age:20
}
];

JavaScript for Everyone

By Asabeneh Shitahun Yetayeh: Instructor and Developer

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