mirror of
https://github.com/freeCodeCamp/freeCodeCamp.git
synced 2026-06-28 21:00:56 +08:00
fix: loop quiz (#58361)
This commit is contained in:
Ilenia
GitHub
parent
436d27da52
commit
53f3d8d885
@ -26,7 +26,7 @@ for (const color of colors) {
|
||||
|
||||
## --answers--
|
||||
|
||||
```js
|
||||
```md
|
||||
red
|
||||
green
|
||||
blue
|
||||
@ -34,7 +34,7 @@ blue
|
||||
|
||||
---
|
||||
|
||||
```js
|
||||
```md
|
||||
red
|
||||
red
|
||||
red
|
||||
@ -46,7 +46,7 @@ Think about what the `color` variable represents in the loop.
|
||||
|
||||
---
|
||||
|
||||
```js
|
||||
```md
|
||||
color
|
||||
color
|
||||
color
|
||||
@ -58,7 +58,7 @@ Think about what the `color` variable represents in the loop.
|
||||
|
||||
---
|
||||
|
||||
```js
|
||||
```md
|
||||
blue
|
||||
blue
|
||||
red
|
||||
@ -125,7 +125,7 @@ for (let fruit of fruits) {
|
||||
|
||||
## --answers--
|
||||
|
||||
```js
|
||||
```md
|
||||
APPLE
|
||||
APPLE
|
||||
APPLE
|
||||
@ -137,7 +137,7 @@ Think about what the fruit variable represents in the loop and how the `toUpperC
|
||||
|
||||
---
|
||||
|
||||
```js
|
||||
```md
|
||||
apple
|
||||
banana
|
||||
cherry
|
||||
@ -149,7 +149,7 @@ Think about what the fruit variable represents in the loop and how the `toUpperC
|
||||
|
||||
---
|
||||
|
||||
```js
|
||||
```md
|
||||
APPLE
|
||||
BANANA
|
||||
CHERRY
|
||||
@ -157,7 +157,7 @@ CHERRY
|
||||
|
||||
---
|
||||
|
||||
```js
|
||||
```md
|
||||
FRUIT
|
||||
FRUIT
|
||||
FRUIT
|
||||
|
||||
@ -33,7 +33,7 @@ It is the process of sending signals between components to establish a connectio
|
||||
|
||||
#### --answer--
|
||||
|
||||
It is the process of repeating a set of instructions multiple times until a condition is met.
|
||||
It is the process of repeating a set of instructions multiple times.
|
||||
|
||||
### --question--
|
||||
|
||||
@ -61,23 +61,23 @@ Looping
|
||||
|
||||
#### --text--
|
||||
|
||||
Which of the following is not an iterable object?
|
||||
Which of the following is an iterable object?
|
||||
|
||||
#### --distractors--
|
||||
|
||||
Map
|
||||
Undefined
|
||||
|
||||
---
|
||||
|
||||
String
|
||||
Number
|
||||
|
||||
---
|
||||
|
||||
Array
|
||||
Boolean
|
||||
|
||||
#### --answer--
|
||||
|
||||
Math object.
|
||||
String
|
||||
|
||||
### --question--
|
||||
|
||||
@ -110,29 +110,33 @@ What is the correct order of the `for` loop declaration?
|
||||
#### --distractors--
|
||||
|
||||
```javascript
|
||||
for (condition; increment/decrement; initialization)
|
||||
for (condition; increment/decrement; initialization) {
|
||||
statement;
|
||||
}
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
```javascript
|
||||
for (increment/decrement; condition; initialization)
|
||||
for (increment/decrement; condition; initialization) {
|
||||
statement;
|
||||
}
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
```javascript
|
||||
for (initialization; increment/decrement; condition)
|
||||
for (initialization; increment/decrement; condition) {
|
||||
statement;
|
||||
}
|
||||
```
|
||||
|
||||
#### --answer--
|
||||
|
||||
```javascript
|
||||
for (initialization; condition; increment/decrement)
|
||||
for (initialization; condition; increment/decrement) {
|
||||
statement;
|
||||
}
|
||||
```
|
||||
|
||||
### --question--
|
||||
@ -161,7 +165,7 @@ Which loop executes the code block once, before checking if the condition is tru
|
||||
|
||||
#### --text--
|
||||
|
||||
Which loop loops over the values of an iterable object?
|
||||
Which of the following will loop over the values of an iterable object?
|
||||
|
||||
#### --distractors--
|
||||
|
||||
@ -199,29 +203,35 @@ A loop that automatically stops after a fixed number of iterations.
|
||||
|
||||
#### --answer--
|
||||
|
||||
A loop that continues to run indefinitely because the termination condition is never met or is absent.
|
||||
A loop whose termination condition is never met or is absent.
|
||||
|
||||
### --question--
|
||||
|
||||
#### --text--
|
||||
|
||||
For iterating over an array, which loop is not the best?
|
||||
How many times will the following loop run?
|
||||
|
||||
```js
|
||||
for (let i = 2; i < 10; i+=2) {
|
||||
console.log(i);
|
||||
}
|
||||
```
|
||||
|
||||
#### --distractors--
|
||||
|
||||
`for` loop.
|
||||
5
|
||||
|
||||
---
|
||||
|
||||
`for...of` loop.
|
||||
9
|
||||
|
||||
---
|
||||
|
||||
`for...in` loop.
|
||||
10
|
||||
|
||||
#### --answer--
|
||||
|
||||
`while` loop.
|
||||
4
|
||||
|
||||
### --question--
|
||||
|
||||
@ -271,7 +281,7 @@ What is the difference between the `for...in` loop and the `for...of` loop?
|
||||
|
||||
#### --text--
|
||||
|
||||
To prevent an infinite loop from occurring, all but one of these are expected to be part of the loop used.
|
||||
Which of these would cause an infinite loop?
|
||||
|
||||
#### --distractors--
|
||||
|
||||
@ -337,29 +347,41 @@ The `continue` statement.
|
||||
|
||||
#### --text--
|
||||
|
||||
It is generally recommended to avoid using the `for...in` loop in JavaScript. What is the reason for that?
|
||||
What is printed to the console with the following code?
|
||||
|
||||
```js
|
||||
for (let i = 0; i < 25; i += 2) {
|
||||
if (i % 5 === 0) {
|
||||
continue;
|
||||
}
|
||||
if (i % 13 === 0) {
|
||||
break;
|
||||
}
|
||||
console.log(i);
|
||||
}
|
||||
```
|
||||
|
||||
#### --distractors--
|
||||
|
||||
It only works with arrays and not with objects.
|
||||
`0`, `2`, `4`, `6`, `8`, `12`, `14`, `16`, `18`, `22`, `24`
|
||||
|
||||
---
|
||||
|
||||
It is the best way to iterate over large objects.
|
||||
`0`, `2`, `4`, `6`, `8`, `12`
|
||||
|
||||
---
|
||||
|
||||
It guarantees the order of property enumeration.
|
||||
`2`, `4`, `6`, `8`, `12`
|
||||
|
||||
#### --answer--
|
||||
|
||||
It could enumerate over inherited properties of an object.
|
||||
`2`, `4`, `6`, `8`, `12`, `14`, `16`, `18`, `22`, `24`
|
||||
|
||||
### --question--
|
||||
|
||||
#### --text--
|
||||
|
||||
What will be the output of the code below?
|
||||
What would the following code print to the console??
|
||||
|
||||
```javascript
|
||||
for (let i = 1; i < 6; i++) {
|
||||
@ -370,33 +392,25 @@ for (let i = 1; i < 6; i++) {
|
||||
|
||||
#### --distractors--
|
||||
|
||||
```javascript
|
||||
1,2,3,4,5,6
|
||||
```
|
||||
`1`, `2`, `3`, `4`, `5`, `6`
|
||||
|
||||
---
|
||||
|
||||
```javascript
|
||||
1,2,3,4,5
|
||||
```
|
||||
`1`, `2`, `3`, `4`, `5`
|
||||
|
||||
---
|
||||
|
||||
```javascript
|
||||
1,2,3,4
|
||||
```
|
||||
`1`, `2`, `3`, `4`
|
||||
|
||||
#### --answer--
|
||||
|
||||
```javascript
|
||||
1,2,3
|
||||
```
|
||||
`1`, `2`, `3`
|
||||
|
||||
### --question--
|
||||
|
||||
#### --text--
|
||||
|
||||
What will be the output of the code below?
|
||||
What will be printed to the console with the code below?
|
||||
|
||||
```javascript
|
||||
const shoppingList = { tomatoes: 4, apples: 10 };
|
||||
@ -407,33 +421,25 @@ for (const item in shoppingList) {
|
||||
|
||||
#### --distractors--
|
||||
|
||||
```javascript
|
||||
tomatoes - 4, apples - 10
|
||||
```
|
||||
`tomatoes - 4`, `apples - 10`
|
||||
|
||||
---
|
||||
|
||||
```javascript
|
||||
4, 10
|
||||
```
|
||||
`4`, `10`
|
||||
|
||||
---
|
||||
|
||||
```javascript
|
||||
tomatoes:4, apples:10
|
||||
```
|
||||
`tomatoes:4`, `apples:10`
|
||||
|
||||
#### --answer--
|
||||
|
||||
```javascript
|
||||
tomatoes, apples
|
||||
```
|
||||
`tomatoes`, `apples`
|
||||
|
||||
### --question--
|
||||
|
||||
#### --text--
|
||||
|
||||
What will be the output of the code below?
|
||||
What will be the console output of the code below?
|
||||
|
||||
```javascript
|
||||
for (let i = 2; i <= 13; i++) {
|
||||
@ -444,64 +450,48 @@ for (let i = 2; i <= 13; i++) {
|
||||
|
||||
#### --distractors--
|
||||
|
||||
```javascript
|
||||
2,4,6,8,10,12
|
||||
```
|
||||
`2`, `4`, `6`, `8`, `10`, `12`
|
||||
|
||||
---
|
||||
|
||||
```javascript
|
||||
1,3,5,7,9,11,13
|
||||
```
|
||||
`1`, `3`, `5`, `7`, `9`, `11`, `13`
|
||||
|
||||
---
|
||||
|
||||
```javascript
|
||||
1,3,5,7,9,11
|
||||
```
|
||||
`1`, `3`, `5`, `7`, `9`, `11`
|
||||
|
||||
#### --answer--
|
||||
|
||||
```javascript
|
||||
3,5,7,9,11,13
|
||||
```
|
||||
`3`, `5`, `7`, `9`, `11`, `13`
|
||||
|
||||
### --question--
|
||||
|
||||
#### --text--
|
||||
|
||||
What would be the output of the code below?
|
||||
What would be printed to the console with the code below?
|
||||
|
||||
```javascript
|
||||
const fruits = ["Mango", "Pineapple", "Oranges"];
|
||||
for (const fruit in fruits) {
|
||||
for (const fruit of fruits) {
|
||||
console.log(fruit);
|
||||
}
|
||||
```
|
||||
|
||||
#### --distractors--
|
||||
|
||||
```javascript
|
||||
Mango, Pineapple
|
||||
```
|
||||
`0`, `1`, `2`
|
||||
|
||||
---
|
||||
|
||||
```javascript
|
||||
Pineapple, Oranges, Mango
|
||||
```
|
||||
`Pineapple`, `Oranges`, `Mango`
|
||||
|
||||
---
|
||||
|
||||
```javascript
|
||||
Oranges, Pineapple, Mango
|
||||
```
|
||||
`Oranges`, `Pineapple`, `Mango`
|
||||
|
||||
#### --answer--
|
||||
|
||||
```javascript
|
||||
Mango, Pineapple, Oranges
|
||||
```
|
||||
`Mango`, `Pineapple`, `Oranges`
|
||||
|
||||
### --question--
|
||||
|
||||
@ -518,17 +508,17 @@ while (x < 5) {
|
||||
|
||||
#### --distractors--
|
||||
|
||||
3 times.
|
||||
3 times
|
||||
|
||||
---
|
||||
|
||||
4 times.
|
||||
4 times
|
||||
|
||||
---
|
||||
|
||||
5 times.
|
||||
5 times
|
||||
|
||||
#### --answer--
|
||||
|
||||
Infinite.
|
||||
Infinite times
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user