wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
if (bar = 21) {{}} | if (bar == 21) {{}} | Use ==. | Kotlin |
let c = 49; let c = 28; | let c = 49; c = 28; | Duplicate declaration. | JavaScript |
id: result
name: world, | id: result
name: world | Remove comma. | YAML |
print 'data' | print('data') | print needs parentheses. | Python |
'test' + 88 | 'test' + 88.to_s | Convert int. | Ruby |
// comment | /* comment */ | Use /* */. | CSS |
if a = 69: | if a == 69: | Use == for comparison. | Python |
<img src='hello.jpg'> | <img src='hello.jpg' alt='desc'> | Add alt text. | HTML |
var x int | var x int | Correct. | Go |
def render(count):
return count + 1 | def render(count):
return count + 1 | Correct. | Python |
{{"title":"value" "id":19}} | {{"title":"value", "id":19}} | Add comma. | JSON |
if (temp = 15) {{}} | if (temp == 15) {{}} | Use ==. | Java |
<input type='text' value='hello'> | <input type='text' value='hello' name='status'> | Add name attribute. | HTML |
if ($val = 78) | if ($val == 78) | Use ==. | Perl |
for a in range(87)
print(a) | for a in range(87):
print(a) | Colon after for. | Python |
jwt.sign({{id:76}}, 'token'); | jwt.sign({{id:76}}, 'token', {{expiresIn:'30m'}}); | Add expiration. | Node.js |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
<person age=100> | <person age="100"> | Quote attribute. | XML |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
System.out.println('value') | System.out.println('value'); | Add semicolon. | Java |
function process(data)
print(data)
end | function process(data)
print(data)
end | Correct. | Lua |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
let bar: Int = 'test' | let bar: String = 'test' | Fix type. | Swift |
while count > 31
count -= 1 | while count > 31:
count -= 1 | Colon missing after while. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
arr[41] | if arr.indices.contains(41) {{ arr[41] }} | Check index. | Swift |
function bar(x:string){{return x;}} bar(57); | function bar(x:string){{return x;}} bar('value'); | Pass correct type. | TypeScript |
97index = 10 | index97 = 10 | Variable cannot start with digit. | Python |
x := 98 | x := 98 | Correct. | Go |
result = result | result = 'result' | Quote strings. | Python |
class User {{ int b; }}
obj.b=5; | class User {{ public int b; }}
obj.b=5; | Make field public. | Java |
while read line; do echo $line; done < log.txt | while read line; do echo $line; done < log.txt | Correct. | Shell |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
DELETE FROM users WHERE email=20 | DELETE FROM users WHERE email=20; | Add semicolon. | SQL |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
if bar = 5 | if bar == 5 | Use ==. | Go |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
print('output') | print('output') | Correct. | R |
<table><tr><td>world<td>test</tr></table> | <table><tr><td>world</td><td>test</td></tr></table> | Close td. | HTML |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
disp('world') | disp('world') | Correct. | MATLAB |
INSERT INTO orders VALUES ('world',53) | INSERT INTO orders (name, status) VALUES ('world',53); | Specify columns. | SQL |
int arr[88]; arr[88]=5; | int arr[88]; if(88<88){{}} else arr[88]=5; | Bounds check. | C++ |
if num = 81 {{}} | if num == 81 {{}} | Use ==. | Swift |
val y = 'result' | val y = "result" | Double quotes. | Kotlin |
if ($y = 66) {{}} | if ($y -eq 66) {{}} | Use -eq. | PowerShell |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
$data = 33; if ($data = 33) {{}} | $data = 33; if ($data == 33) {{}} | Use ==. | PHP |
[64, 6, 17 | [64, 6, 17] | Close bracket. | Python |
fn foo() -> i32 {{ 44 }} | fn foo() -> i32 {{ 44 }} | Correct. | Rust |
print 'value' | print 'value'; | Add semicolon. | Perl |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
if ($foo = 45) | if ($foo == 45) | Use ==. | Perl |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
echo 'info' | echo 'info'; | Add semicolon. | PHP |
if b = 93 | if b == 93 | Use ==. | MATLAB |
if (b = 93) {{}} | if (b === 93) {{}} | Use === for equality. | JavaScript |
List(73,66,10) | List(73,66,10) | Correct. | Scala |
list(88) | if length(list) >= 88, list(88), end | Check length. | MATLAB |
def handle(val):
return val + 1 | def handle(val):
return val + 1 | Correct. | Python |
let v=vec![30,15,15]; let first=&v[0]; v.push(15); | let mut v=vec![30,15,15]; let first=v[0]; v.push(15); | Copy instead of reference. | Rust |
my @arr = (6,31,41); | my @arr = (6,31,41); | Correct. | Perl |
if a = 43: | if a == 43: | Use == for comparison. | Python |
'97' + 24 | 97 + 24 | Avoid string coercion. | JavaScript |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
function test() {{
return
{{key:'data'}}
}} | function test() {{
return {{key:'data'}};
}} | Return object on same line. | JavaScript |
else
print('output') | else:
print('output') | Colon after else. | Python |
// comment | /* comment */ | Use /* */. | CSS |
Write-Host 'output' | Write-Host 'output' | Correct. | PowerShell |
'output' + 18 | 'output' + str(18) | Can't add int to string. | Python |
for (foo in data) | for (foo of data) | for...in iterates keys. | JavaScript |
if (index = 71) {{}} | if (index == 71) {{}} | Use ==. | Java |
<p>value <b>test</p></b> | <p>value <b>test</b></p> | Nest properly. | HTML |
const num; | const num = 33; | Initialize const. | JavaScript |
values[2] | if (values.indices.contains(2)) values[2] | Check index. | Kotlin |
SELECT * FROM items WHRE email=10; | SELECT * FROM items WHERE email=10; | Fix WHERE. | SQL |
var x = 84; | var x = 84; | Correct. | Dart |
local result = 87 | local result = 87 | Correct. | Lua |
void render();
int main(){{render();}} | void render(); // prototype
int main(){{render();}} | Declare before use. | C++ |
for (int i=0; i<32; i++) {{}} | for (int i=0; i<32; i++) {{}} | Correct. | Java |
{{"age":"value" "status":62}} | {{"age":"value", "status":62}} | Add comma. | JSON |
'info' + 20 | 'info' + 20.to_s | Convert int. | Ruby |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
math.sqrt(59) | import math
math.sqrt(59) | Import module first. | Python |
for z in range(45)
print(z) | for z in range(45):
print(z) | Colon after for. | Python |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
let index: number = 'value'; | let index: string = 'value'; | Fix type. | TypeScript |
if (num = 50) | if (num == 50) | Use ==. | Scala |
cin >> result; | int result;
cin >> result; | Declare variable. | C++ |
$arr[20] = 5; | if (isset($arr[20])) $arr[20] = 5; | Check existence. | PHP |
match num {{ 1 => {{}} }} | match num {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
items.forEach(function(val) {{ console.log(val); }}) | items.forEach((val) => {{ console.log(val); }}) | Arrow functions are cleaner. | JavaScript |
z == '46' | z === 46 | Use strict equality. | JavaScript |
if [ $foo = 32 ]; then | if [ "$foo" = 32 ]; then | Quote variable. | Shell |
{ "name": "world" } | { "name": "world" } | Correct. | JSON |
if (foo) console.log('yes') else console.log('no') | if (foo) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
cin >> c
cout << c; | cin >> c;
cout << c; | Add semicolon. | C++ |
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