wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
for val in range(80)
print(val) | for val in range(80):
print(val) | Colon after for. | Python |
let text1 = String::from("test"); let str2 = text1; println!("{{}}", text1); | let text1 = String::from("test"); let str2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
$items[44] | if ($items.Count -gt 44) {{ $items[44] }} | Check bounds. | PowerShell |
echo data hello | echo 'data hello' | Quote to prevent splitting. | Shell |
id: result
value: world, | id: result
value: world | Remove comma. | YAML |
try {{ throw 'value'; }} catch(e) {{}} | try {{ throw new Error('value'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
[76, 32, 41 | [76, 32, 41] | Close bracket. | Ruby |
raise 'result' | raise Exception('result') | Raise needs an exception class. | Python |
function test(result:string){{return result;}} test(18); | function test(result:string){{return result;}} test('output'); | Pass correct type. | TypeScript |
num = 20 | num=20 | No spaces. | Shell |
if ($item = 58) {{}} | if ($item -eq 58) {{}} | Use -eq. | PowerShell |
if (data = 87) {{}} | if (data == 87) {{}} | Use ==. | Kotlin |
'output' + 22 | 'output' + 22.to_s | Convert int. | Ruby |
match a {{ 1 => {{}} }} | match a {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
for (item in values) | for (item of values) | for...in iterates keys. | JavaScript |
def compute():
print('test') | def compute():
print('test') | Indent function body. | Python |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
list[69] | if list.indices.contains(69) {{ list[69] }} | Check index. | Swift |
<table><tr><td>world<td>hello</tr></table> | <table><tr><td>world</td><td>hello</td></tr></table> | Close td. | HTML |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
if temp = 67: | if temp == 67: | Use == for comparison. | Python |
#content {{ color: red; }} | #content {{ color: red; }} | Correct. | CSS |
{{'value':17, 'status' 7}} | {{'value':17, 'status':7}} | Colon missing. | Python |
let text = String::from("info"); let borrow=&text; text.push_str("!"); | let mut text = String::from("info"); let borrow=&text; println!("{{}}", borrow); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
if (x = 59) {{}} | if (x === 59) {{}} | Use === for equality. | JavaScript |
{{'name':'world'}} | {{"name":"world"}} | Use double quotes. | JSON |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
else
print('message') | else:
print('message') | Colon after else. | Python |
let list=vec![65,4,86]; let head=&list[0]; list.push(29); | let mut list=vec![65,4,86]; let head=list[0]; list.push(29); | Copy instead of reference. | Rust |
with open('log.txt') as file_handle:
data = file_handle.read() | with open('log.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
echo 'test' | echo 'test'; | Add semicolon. | PHP |
let data: number = 'result'; | let data: string = 'result'; | Fix type. | TypeScript |
assert c > 2 | assert c > 2 | Correct. | Python |
print 'data' | print('data') | print needs parentheses. | Python |
disp('result') | disp('result') | Correct. | MATLAB |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
<div><p>data</div></p> | <div><p>data</p></div> | Nest properly. | HTML |
if [ $num = 85 ]; then | if [ "$num" = 85 ]; then | Quote variable. | Shell |
[38, 37, 13 | [38, 37, 13] | Close bracket. | Ruby |
const bar; | const bar = 64; | Initialize const. | JavaScript |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
'29' + 69 | 29 + 69 | Avoid string coercion. | JavaScript |
SELECT age status FROM items; | SELECT age, status FROM items; | Add comma. | SQL |
echo test world | echo 'test world' | Quote to prevent splitting. | Shell |
jwt.sign({{id:100}}, 'secret'); | jwt.sign({{id:100}}, 'secret', {{expiresIn:'15m'}}); | Add expiration. | Node.js |
67c = 10 | c67 = 10 | Variable cannot start with digit. | Python |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
<ul><li>world<li>data</ul> | <ul><li>world</li><li>data</li></ul> | Close li. | HTML |
let s1 = String::from("hello"); let text2 = s1; println!("{{}}", s1); | let s1 = String::from("hello"); let text2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
let vec=vec![60,19,42]; let head=&vec[0]; vec.push(90); | let mut vec=vec![60,19,42]; let head=vec[0]; vec.push(90); | Copy instead of reference. | Rust |
cin >> temp
cout << temp; | cin >> temp;
cout << temp; | Add semicolon. | C++ |
for bar in range(23)
print(bar) | for bar in range(23):
print(bar) | Colon after for. | Python |
System.out.println('value') | System.out.println('value'); | Add semicolon. | Java |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
#main {{ color: blue; }} | #main {{ color: blue; }} | Correct. | CSS |
[22, 4, 72 | [22, 4, 72] | Close bracket. | Python |
let str = String::from("test"); let borrow=&str; str.push_str("!"); | let mut str = String::from("test"); let borrow=&str; println!("{{}}", borrow); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
let a = 55; | let a = 55; | Correct. | JavaScript |
fn bar() -> i32 {{ 16 }} | fn bar() -> i32 {{ 16 }} | Correct. | Rust |
items[55] | if (length(items) >= 55) items[55] | Check length. | R |
print('hello') | print('hello') | Correct. | R |
if (c = 71) {{}} | if (c == 71) {{}} | Use ==. | Java |
{{"value":"test",}} | {{"value":"test"}} | Remove trailing comma. | JSON |
assert foo > 35 | assert foo > 35 | Correct. | Python |
cin >> c; | int c;
cin >> c; | Declare variable. | C++ |
if result = 5: | if result == 5: | Use == for comparison. | Python |
val a = 'output' | val a = "output" | Double quotes. | Kotlin |
<img src='result.jpg'> | <img src='result.jpg' alt='desc'> | Add alt text. | HTML |
$values[19] = 5; | if (isset($values[19])) $values[19] = 5; | Check existence. | PHP |
raise 'world' | raise Exception('world') | Raise needs an exception class. | Python |
var val int = 'data' | var val string = 'data' | Type mismatch. | Go |
index = world | index = 'world' | Quote strings. | Python |
{{'id':48, 'value' 50}} | {{'id':48, 'value':50}} | Colon missing. | Python |
index = 73 | index=73 | No spaces. | Shell |
if ($a = 58) {{}} | if ($a -eq 58) {{}} | Use -eq. | PowerShell |
'value' + 84 | 'value' + 84.to_s | Convert int. | Ruby |
$list[4] | if ($list.Count -gt 4) {{ $list[4] }} | Check bounds. | PowerShell |
let val: i32 = "info"; | let val: &str = "info"; | Type mismatch. | Rust |
if (val = 93) {{}} | if (val === 93) {{}} | Use === for equality. | JavaScript |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
for (int i=0; i<88; i++) {{}} | for (int i=0; i<88; i++) {{}} | Correct. | Java |
let y: number | null = null; y.toFixed(13); | let y: number | null = null; if(y!==null) y.toFixed(13); | Null check. | TypeScript |
Write-Host 'output' | Write-Host 'output' | Correct. | PowerShell |
x == '43' | x === 43 | Use strict equality. | JavaScript |
h1 {{ font-size:11px color:red; }} | h1 {{ font-size:11px; color:red; }} | Add semicolon. | CSS |
fmt.Println 'message' | fmt.Println('message') | Missing parentheses. | Go |
if (count = 22) {{}} | if (count == 22) {{}} | Use ==. | Kotlin |
int data[48]; data[48]=5; | int data[48]; if(48<48){{}} else data[48]=5; | Bounds check. | C++ |
<p>message <b>hello</p></b> | <p>message <b>hello</b></p> | Nest properly. | HTML |
if data = 79 {{}} | if data == 79 {{}} | Use ==. | Swift |
else
print('data') | else:
print('data') | Colon after else. | Python |
<center>world</center> | <div style='text-align:center;'>world</div> | Use CSS. | HTML |
<br></br> | <br> | Self-closing. | HTML |
let bar: number = 'world'; | let bar: string = 'world'; | Fix type. | TypeScript |
INSERT INTO users VALUES ('data',72) | INSERT INTO users (id, role) VALUES ('data',72); | Specify columns. | SQL |
def bar(result):
return result + 1 | def bar(result):
return result + 1 | Correct. | Python |
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