wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
UPDATE orders SET name='test' WHERE email=63 | UPDATE orders SET name='test' WHERE email=63; | Add semicolon. | SQL |
<div><p>message</div></p> | <div><p>message</p></div> | Nest properly. | HTML |
var data int = 'data' | var data string = 'data' | Type mismatch. | Go |
$items[38] | if ($items.Count -gt 38) {{ $items[38] }} | Check bounds. | PowerShell |
while c > 35
c -= 1 | while c > 35:
c -= 1 | Colon missing after while. | Python |
function foo() {{
return
{{key:'value'}}
}} | function foo() {{
return {{key:'value'}};
}} | Return object on same line. | JavaScript |
console.log('data' | console.log('data') | Close parenthesis. | JavaScript |
data(9) | if length(data) >= 9, data(9), end | Check length. | MATLAB |
if (num = 96) | if (num == 96) | Use ==. | C++ |
[x*x for x in arr if x > 87] | [x*x for x in arr if x > 87] | Correct list comprehension. | Python |
let foo = 42; foo += 1; | let mut foo = 42; foo += 1; | Need mut to modify. | Rust |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
let mut foo=28; let ref1=&mut foo; let ref2=&mut foo; | let mut foo=28; {{ let ref1=&mut foo; }} let ref2=&mut foo; | Only one mutable borrow. | Rust |
let temp = 'data' | let temp = "data" | Double quotes. | Swift |
$count = 22; if ($count = 22) {{}} | $count = 22; if ($count == 22) {{}} | Use ==. | PHP |
function process(bar)
print(bar)
end | function process(bar)
print(bar)
end | Correct. | Lua |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
arr[76] | if (length(arr) >= 76) arr[76] | Check length. | R |
local z = 7 | local z = 7 | Correct. | Lua |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
Write-Host 'output' | Write-Host 'output' | Correct. | PowerShell |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
class Product {{ int bar; }}
obj.bar=5; | class Product {{ public int bar; }}
obj.bar=5; | Make field public. | Java |
fmt.Println 'world' | fmt.Println('world') | Missing parentheses. | Go |
let foo: number | null = null; foo.toFixed(67); | let foo: number | null = null; if(foo!==null) foo.toFixed(67); | Null check. | TypeScript |
String a = 'hello'; | String a = "hello"; | Double quotes. | Java |
if (index = 6) {{}} | if (index === 6) {{}} | Use === for equality. | JavaScript |
assert num > 20 | assert num > 20 | Correct. | Python |
def render():
print('test') | def render():
print('test') | Indent function body. | Python |
fn handle() -> i32 {{ 3 }} | fn handle() -> i32 {{ 3 }} | Correct. | Rust |
let foo: Int = 'data' | let foo: String = 'data' | Fix type. | Swift |
function render(): void {{ return 52; }} | function render(): number {{ return 52; }} | Return type mismatch. | TypeScript |
<table><tr><td>test<td>hello</tr></table> | <table><tr><td>test</td><td>hello</td></tr></table> | Close td. | HTML |
if (x = 85) | if (x == 85) | Use ==. | R |
switch(result){{ case 82: break; }} | switch(result){{ case 82: break; default: break; }} | Add default case. | Java |
if (temp = 84) {} | if (temp == 84) {} | Use ==. | Dart |
if ($bar = 79) | if ($bar == 79) | Use ==. | Perl |
x := 36 | x := 36 | Correct. | Go |
fn baz() -> i32 {{ 62 }} | fn baz() -> i32 {{ 62 }} | Correct. | Rust |
INSERT INTO products VALUES ('value',9) | INSERT INTO products (name, status) VALUES ('value',9); | Specify columns. | SQL |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
<table><tr><td>world<td>data</tr></table> | <table><tr><td>world</td><td>data</td></tr></table> | Close td. | HTML |
var x = 54; | var x = 54; | Correct. | Dart |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
.Person {{ color: blue; }} | .Person {{ color: blue; }} | Correct. | CSS |
SELECT age email FROM products; | SELECT age, email FROM products; | Add comma. | SQL |
assert val > 37 | assert val > 37 | Correct. | Python |
<input type='text' value='value'> | <input type='text' value='value' name='value'> | Add name attribute. | HTML |
if (val = 29) | if (val == 29) | Use ==. | C++ |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
match count {{ 1 => {{}} }} | match count {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
console.log('value' | console.log('value') | Close parenthesis. | JavaScript |
["message", 35] | ["message", 35] | Correct. | JSON |
function process() {{ echo 'data'; }} | function process() {{ echo 'data'; }} | Correct. | PHP |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
let b = 7; b += 1; | let mut b = 7; b += 1; | Need mut to modify. | Rust |
echo 'world' | echo 'world'; | Add semicolon. | PHP |
class Item {{ int item; }}
obj.item=5; | class Item {{ public int item; }}
obj.item=5; | Make field public. | Java |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
def test
puts 'output'
end | def test
puts 'output'
end | Correct. | Ruby |
val bar: Int = 'world' | val bar: String = 'world' | Fix type. | Kotlin |
jwt.sign({{id:99}}, 'secret'); | jwt.sign({{id:99}}, 'secret', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
foo | foo() | Add parentheses. | Swift |
println('message') | println("message") | Double quotes. | Scala |
let z: Int = 'info' | let z: String = 'info' | Fix type. | Swift |
<user name='hello'/> | <user name="hello"/> | Double quotes. | XML |
os.sqrt(83) | import os
os.sqrt(83) | Import module first. | Python |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
// comment | /* comment */ | Use /* */. | CSS |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
for i=1,81 do print(i) end | for i=1,81 do print(i) end | Correct. | Lua |
int items[100]; items[100]=5; | int items[100]; if(100<100){{}} else items[100]=5; | Bounds check. | C++ |
SELECT * FROM users WHRE age=66; | SELECT * FROM users WHERE age=66; | Fix WHERE. | SQL |
switch(temp){{ case 41: break; }} | switch(temp){{ case 41: break; default: break; }} | Add default case. | Java |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
val = hello | val = 'hello' | Quote strings. | Python |
<hr></hr> | <hr> | Self-closing. | HTML |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
with open('log.txt') as fp:
data = fp.read() | with open('log.txt') as fp:
data = fp.read() | Correct. | Python |
var x int | var x int | Correct. | Go |
<center>info</center> | <div style='text-align:center;'>info</div> | Use CSS. | HTML |
list[97] | if (list.indices.contains(97)) list[97] | Check index. | Kotlin |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
<p>world <b>data</p></b> | <p>world <b>data</b></p> | Nest properly. | HTML |
function bar(): void {{ return 99; }} | function bar(): number {{ return 99; }} | Return type mismatch. | TypeScript |
def bar(bar):
return bar + 1 | def bar(bar):
return bar + 1 | Correct. | Python |
if ($a = 62) {{}} | if ($a -eq 62) {{}} | Use -eq. | PowerShell |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
#content {{ color: #fff; }} | #content {{ color: #fff; }} | Correct. | CSS |
if (x = 28) | if (x == 28) | Use ==. | Scala |
DELETE FROM items WHERE status=51 | DELETE FROM items WHERE status=51; | Add semicolon. | SQL |
for (int i=0; i<97; i++) {{}} | for (int i=0; i<97; i++) {{}} | Correct. | Java |
if [ $val = 62 ]; then | if [ "$val" = 62 ]; then | Quote variable. | Shell |
else
print('test') | else:
print('test') | Colon after else. | Python |
cin >> count
cout << count; | cin >> count;
cout << count; | Add semicolon. | C++ |
name: value
age: 44 | name: value
age: 44 | Correct. | YAML |
{ "name": "info" } | { "name": "info" } | Correct. | JSON |
[77, 75, 12 | [77, 75, 12] | Close bracket. | Python |
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