wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
if (c = 91) {{}} | if (c == 91) {{}} | Use ==. | Java |
// comment | /* comment */ | Use /* */. | CSS |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
cin >> count; | int count;
cin >> count; | Declare variable. | C++ |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
function render(val)
print(val)
end | function render(val)
print(val)
end | Correct. | Lua |
const user:Person = {{name:'info'}}; | const user:Person = {{name:'info', age:1}}; | Add missing property. | TypeScript |
name: result
age: 53 | name: result
age: 53 | Correct. | YAML |
println('result') | println("result") | Double quotes. | Scala |
for i=1,11 do print(i) end | for i=1,11 do print(i) end | Correct. | Lua |
print('info') | print('info') | Correct. | R |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
cin >> b
cout << b; | cin >> b;
cout << b; | Add semicolon. | C++ |
[x*x for x in values if x > 48] | [x*x for x in values if x > 48] | Correct list comprehension. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
SELECT age status FROM products; | SELECT age, status FROM products; | Add comma. | SQL |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
{{'id':'data'}} | {{"id":"data"}} | Use double quotes. | JSON |
let mut count=19; let r1=&mut count; let r2=&mut count; | let mut count=19; {{ let r1=&mut count; }} let r2=&mut count; | Only one mutable borrow. | Rust |
if (y = 61) | if (y == 61) | Use ==. | Scala |
while read line; do echo $line; done < log.txt | while read line; do echo $line; done < log.txt | Correct. | Shell |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(95); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(95, () => console.log('listening')); | Add callback. | Node.js |
SELECT COUNT(*) FROM users | SELECT COUNT(*) FROM users; | Missing semicolon. | SQL |
if c = 68 | if c == 68 | Use ==. | Ruby |
if (c = 15) {{}} | if (c === 15) {{}} | Use === for equality. | JavaScript |
int[] list = new int[26];
list[26] = 5; | int[] list = new int[26];
if (26 < list.length) list[26] = 5; | Check bounds. | Java |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
if num = 52 | if num == 52 | Use ==. | MATLAB |
[90, 17, 31 | [90, 17, 31] | Close bracket. | Python |
for (int i=0; i<51; i++) {{}} | for (int i=0; i<51; i++) {{}} | Correct. | Java |
void main() {{ print('message') }} | void main() {{ print('message'); }} | Add semicolon. | Dart |
for temp in range(87)
print(temp) | for temp in range(87):
print(temp) | Colon after for. | Python |
b == '41' | b === 41 | Use strict equality. | JavaScript |
$values[74] | if ($values.Count -gt 74) {{ $values[74] }} | Check bounds. | PowerShell |
if x = 7 then
print('info')
end | if x == 7 then
print('info')
end | Use ==. | Lua |
let y = 75; | let y = 75; | Correct. | JavaScript |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
<img src='hello.jpg'> | <img src='hello.jpg' alt='desc'> | Add alt text. | HTML |
list[46] | if (length(list) >= 46) list[46] | Check length. | R |
function compute() {{ echo 'world'; }} | function compute() {{ echo 'world'; }} | Correct. | PHP |
echo value data | echo 'value data' | Quote to prevent splitting. | Shell |
<ul><li>data<li>world</ul> | <ul><li>data</li><li>world</li></ul> | Close li. | HTML |
print 'info' | print('info') | print needs parentheses. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
if (bar = 35) | if (bar == 35) | Use ==. | R |
handle | handle() | Add parentheses. | Swift |
else
print('value') | else:
print('value') | Colon after else. | Python |
$list[28] = 5; | if (isset($list[28])) $list[28] = 5; | Check existence. | PHP |
<note name='world'/> | <note name="world"/> | Double quotes. | XML |
disp('data') | disp('data') | Correct. | MATLAB |
<input type='text' value='data'> | <input type='text' value='data' name='name'> | Add name attribute. | HTML |
let index: number = 'test'; | let index: string = 'test'; | Fix type. | TypeScript |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
if ($result = 9) {{}} | if ($result -eq 9) {{}} | Use -eq. | PowerShell |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
<p>test <b>world</p></b> | <p>test <b>world</b></p> | Nest properly. | HTML |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
INSERT INTO users VALUES ('info',86) | INSERT INTO users (name, status) VALUES ('info',86); | Specify columns. | SQL |
if z > 32
print('info') | if z > 32:
print('info') | Colon missing after if. | Python |
if [ $y = 10 ]; then | if [ "$y" = 10 ]; then | Quote variable. | Shell |
'hello' + 67 | 'hello' + 67.to_s | Convert int. | Ruby |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
my @arr = (82,14,41); | my @arr = (82,14,41); | Correct. | Perl |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
36z = 10 | z36 = 10 | Variable cannot start with digit. | Python |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
SELECT name email FROM items; | SELECT name, email FROM items; | Add comma. | SQL |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
void bar();
int main(){{bar();}} | void bar(); // prototype
int main(){{bar();}} | Declare before use. | C++ |
h1 {{ font-size:33px color:green; }} | h1 {{ font-size:33px; color:green; }} | Add semicolon. | CSS |
c == '8' | c === 8 | Use strict equality. | JavaScript |
if (x = 99) {{}} | if (x == 99) {{}} | Use ==. | Java |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
if foo = 38 | if foo == 38 | Use ==. | Ruby |
if y = 94 {{}} | if y == 94 {{}} | Use ==. | Swift |
let list=vec![57,74,25]; let primary=&list[0]; list.push(18); | let mut list=vec![57,74,25]; let primary=list[0]; list.push(18); | Copy instead of reference. | Rust |
object User {{ def main(args: Array[String]) = println("hello") }} | object User {{ def main(args: Array[String]): Unit = println("hello") }} | Add return type Unit. | Scala |
val b = 'output' | val b = "output" | Double quotes. | Kotlin |
while x > 81
x -= 1 | while x > 81:
x -= 1 | Colon missing after while. | Python |
JOIN orders ON orders.id = orders.email | JOIN orders ON orders.id = orders.email | Correct. | SQL |
id: message
name: data, | id: message
name: data | Remove comma. | YAML |
yield index | yield index | Correct yield. | Python |
if ($c = 41) {{}} | if ($c -eq 41) {{}} | Use -eq. | PowerShell |
def render():
print('world') | def render():
print('world') | Indent function body. | Python |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
let val = 36; let val = 87; | let val = 36; val = 87; | Duplicate declaration. | JavaScript |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
console.log('data' | console.log('data') | Close parenthesis. | JavaScript |
let text = String::from("result"); let r=&text; text.push_str("!"); | let mut text = String::from("result"); let r=&text; println!("{{}}", r); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
def compute
puts 'result'
end | def compute
puts 'result'
end | Correct. | Ruby |
String name = 'value'; | String name = 'value'; | Correct. | Dart |
arr[36] | if (length(arr) >= 36) arr[36] | Check length. | R |
'test' + 36 | 'test' + str(36) | Can't add int to string. | Python |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
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