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js-review.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<script>
/****
*
* #Loops, Arrays, & Objects
##Basic Review
1. What is an array in Javascript?
2. What is an object in Javascript?
3. What is the difference between an array and an object?
4. What is a property? A method?
5. Why are loops useful when dealing with arrays?
6. What is an index?
7. What is the difference between dot and bracket notation?
## Practice Problems
1. Write a function, `filterNumbers()` that takes in an array of mixed data types and returns an array of only the numbers type in ascending order.
```js
filterNumbers(["fred", true, 5, 3]) //[3, 5]
```
**/
var testArray = ["fred", true, 5, 3, 1, 10, 100];
function filterNumbers(dataArray) {
var newArray = [];
dataArray.forEach(function (data) {
if (typeof data === "number") {
newArray.push(data);
}
});
return newArray.sort(function (a, b) {
return a - b;
});
}
// console.log(filterNumbers(testArray));
/**
2. Write a function, `getOlder()` that takes in array of dog objects and increases the value of the age properties by 1.
```js
//Example Input:
[
{
name: "Chompers",
breed: "Pug",
age: 7
},
{
name: "Freddy",
breed: "Lab",
age: 4
},
{
name: "Mr. Pig",
breed: "Mastif",
age: 10
}
];
```
```js
//Example output
[
{
name: "Chompers",
breed: "Pug",
age: 8
},
{
name: "Freddy",
breed: "Lab",
age: 5
},
{
name: "Mr. Pig",
breed: "Mastif",
age: 11
}
];
```**/
var arrayDogs = [
{
name: "Chompers",
breed: "Pug",
age: 7
},
{
name: "Freddy",
breed: "Lab",
age: 4
},
{
name: "Mr. Pig",
breed: "Mastif",
age: 10
}
];
function getOlder(dogArray) {
console.log(dogArray);
dogArray.forEach(function (dog) {
dog.age += 1;
});
console.log(dogArray);
return dogArray;
}
// getOlder(arrayDogs);
/**
3. Write a function, `washCars()` that takes in a array of car objects and sets the boolean properties of isDirty to false
```js
// Example input
[
{
make: 'Volvo',
color: 'red',
year: 1996,
isDirty: true
},
{
make: 'Toyota',
color: 'black',
year: 2004,
isDirty: false
},
{
make: 'Ford',
color: 'white',
year: 2007,
isDirty: true
}
]
```
```js
// Example output:
[
{
make: 'Volvo',
color: 'red',
year: 1996,
isDirty: false // changed to false
},
{
make: 'Toyota',
color: 'black',
year: 2004,
isDirty: false // stays the same
},
{
make: 'Ford',
color: 'white',
year: 2007,
isDirty: false // changed to false
}
]
```
**/
var carArray = [
{
make: 'Volvo',
color: 'red',
year: 1996,
isDirty: true
},
{
make: 'Toyota',
color: 'black',
year: 2004,
isDirty: false
},
{
make: 'Ford',
color: 'white',
year: 2007,
isDirty: true
}
];
// console.log(carArray);
function washCars(cars){
cars.forEach(function(car){
car.isDirty = false;
});
return cars;
}
console.log(washCars(carArray));
/**
4. Write a function, `adminList()` that takes in an array of user objects and returns a count of all admins based on the isAdmin property.
a. Write function with the parameter admin list
b. Start the counter tp zero
c. Loop thru the array
d. Increase the counter if it is an adim
e. Return counter
Refactor to return an array of admin-only user emails.
Refactor again to return an array of user objects that are admins.
```js
//Example Input:
[
{
isAdmin: true,
email: '[email protected]'
},
{
isAdmin: true,
email: '[email protected]'
},
{
isAdmin: false,
email: '[email protected]'
}
];
```
```js
// Example Output (before refactor): 2
// Example Output (after 1st refactor):
[
]
// Example Output (after 2nd refactor):
[
{
isAdmin: true,
email: '[email protected]'
},
{
isAdmin: true,
email: '[email protected]'
}
]
```
**/
var userList = [
{
isAdmin: true,
email: '[email protected]'
},
{
isAdmin: true,
email: '[email protected]'
},
{
isAdmin: false,
email: '[email protected]'
}
];
// function adminList(userArray){
// var counter = 0;
//
// userArray.forEach(function(user){
// if (user.isAdmin) counter++;
// });
//
// return counter;
//
// }
// function adminList(userArray){
// var emailArray = [];
//
// userArray.forEach(function(user){
// if (user.isAdmin) {
// emailArray.push(user.email)
// }
// });
//
// return emailArray;
//
// }
function adminList(userArray){
var adminArray = [];
userArray.forEach(function(user){
if (user.isAdmin) {
adminArray.push(user)
}
});
return adminArray;
}
console.log(adminList(userList));
/**
5. Create a function, `makeSandwichObjects()` that takes in two array of strings, breads and fillings and returns an array of sandwichObjects that contain properties for bread and filling and values correspond to the same order of the two passed in arrays. Assume the two array inputs are the same length.
```js
1. Write the function description
2. Create an empty array
3. Loop thru the array
4. Create sandwich object
5. Add sandwich to the list
6. Return the list
// Example Input:
var breads = [
"white",
"wheat",
"rhy",
"white"
];
var fillings = [
"pb&j",
"ham",
"cheese steak",
"tuna"
];
makeSandwichObjects(breads, fillings) // example call to the function
```
```js
// Example Output:
[
{
bread: "white",
filling: "pb&j"
},
{
bread: "wheat",
filling: "ham"
},
{
bread: "rhy",
filling: "cheese steak"
},
{
bread: "white",
filling: "tuna"
}
]
```
*/
var breads = [
"white",
"wheat",
"rhy",
"white"
];
var fillings = [
"pb&j",
"ham",
"cheese steak",
"tuna"
];
function makeSandwichObjects(breads, fillings) {
var sandwichList = [];
for (i =0; i < breads.length; i++){
var sandwich = {
bread: breads[i],
fillings: fillings[i]
}
sandwichList.push(sandwich);
}
return sandwichList;
}
console.log(makeSandwichObjects(breads, fillings));
</script>
</body>
</html>