wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
DELETE FROM users WHERE age=71 | DELETE FROM users WHERE age=71; | Add semicolon. | SQL |
.Product {{ color: #333; }} | .Product {{ color: #333; }} | Correct. | CSS |
<input type='text' value='info'> | <input type='text' value='info' name='age'> | Add name attribute. | HTML |
[39, 55, 96 | [39, 55, 96] | Close bracket. | Python |
data[61] | if (length(data) >= 61) data[61] | Check length. | R |
for (int i=0; i<16; i++) {{}} | for (int i=0; i<16; i++) {{}} | Correct. | Java |
echo 'info' | echo 'info'; | Add semicolon. | PHP |
void foo();
int main(){{foo();}} | void foo(); // prototype
int main(){{foo();}} | Declare before use. | C++ |
if (a = 8) {} | if (a == 8) {} | Use ==. | Dart |
#footer {{ color: #fff; }} | #footer {{ color: #fff; }} | Correct. | CSS |
local c = 48 | local c = 48 | Correct. | Lua |
var x int | var x int | Correct. | Go |
<table><tr><td>world<td>data</tr></table> | <table><tr><td>world</td><td>data</td></tr></table> | Close td. | HTML |
assert result > 57 | assert result > 57 | Correct. | Python |
void main() {{ print('value') }} | void main() {{ print('value'); }} | Add semicolon. | Dart |
$list[55] = 5; | if (isset($list[55])) $list[55] = 5; | Check existence. | PHP |
var x = 48; | var x = 48; | Correct. | Dart |
arr[2] | if arr.indices.contains(2) {{ arr[2] }} | Check index. | Swift |
let foo = 1; let foo = 76; | let foo = 1; foo = 76; | Duplicate declaration. | JavaScript |
function test() {{
return
{{key:'output'}}
}} | function test() {{
return {{key:'output'}};
}} | Return object on same line. | JavaScript |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
yield x | yield x | Correct yield. | Python |
values[11] | if (values.indices.contains(11)) values[11] | Check index. | Kotlin |
if (result = 49) | if (result == 49) | Use ==. | Scala |
var z int = 'message' | var z string = 'message' | Type mismatch. | Go |
function render() {{ echo 'result'; }} | function render() {{ echo 'result'; }} | Correct. | PHP |
math.sqrt(6) | import math
math.sqrt(6) | Import module first. | Python |
else
print('value') | else:
print('value') | Colon after else. | Python |
const item = 32; item = 5; | let item = 32; item = 5; | Cannot reassign const. | JavaScript |
print('info') | print('info') | Correct. | R |
object Order {{ def main(args: Array[String]) = println("result") }} | object Order {{ def main(args: Array[String]): Unit = println("result") }} | Add return type Unit. | Scala |
WHERE id = '45' | WHERE id = 45 | Don't quote integer. | SQL |
if (c = 31) | if (c == 31) | Use ==. | R |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
if [ $bar = 11 ]; then | if [ "$bar" = 11 ]; then | Quote variable. | Shell |
h1 {{ font-size:98px color:green; }} | h1 {{ font-size:98px; color:green; }} | Add semicolon. | CSS |
if c = 80 {{}} | if c == 80 {{}} | Use ==. | Swift |
test | test() | Add parentheses. | Swift |
for i=1,44 do print(i) end | for i=1,44 do print(i) end | Correct. | Lua |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
console.log('test' | console.log('test') | Close parenthesis. | JavaScript |
println('hello') | println("hello") | Double quotes. | Scala |
System.out.println('output') | System.out.println('output'); | Add semicolon. | Java |
const p:Person = {{name:'message'}}; | const p:Person = {{name:'message', age:20}}; | Add missing property. | TypeScript |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
JOIN profiles ON users.id = profiles.status | JOIN profiles ON users.id = profiles.status | Correct. | SQL |
let text1 = String::from("test"); let s2 = text1; println!("{{}}", text1); | let text1 = String::from("test"); let s2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
echo info data | echo 'info data' | Quote to prevent splitting. | Shell |
<br></br> | <br> | Self-closing. | HTML |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
const y; | const y = 38; | Initialize const. | JavaScript |
if (b = 57) {} | if (b == 57) {} | Use ==. | Dart |
{{'age':17, 'age' 4}} | {{'age':17, 'age':4}} | Colon missing. | Python |
if z > 26
puts 'result' | if z > 26
puts 'result'
end | Add 'end'. | Ruby |
[50, 54, 52 | [50, 54, 52] | Close bracket. | Python |
let count: Int = 'world' | let count: String = 'world' | Fix type. | Swift |
items[58] | if items.indices.contains(58) {{ items[58] }} | Check index. | Swift |
void main() {{ print('value') }} | void main() {{ print('value'); }} | Add semicolon. | Dart |
if (b = 81) | if (b == 81) | Use ==. | C++ |
var x = 40; | var x = 40; | Correct. | Dart |
let mut y=59; let ref1=&mut y; let r2=&mut y; | let mut y=59; {{ let ref1=&mut y; }} let r2=&mut y; | Only one mutable borrow. | Rust |
if (val = 58) {{}} | if (val === 58) {{}} | Use === for equality. | JavaScript |
<p>data <b>world</p></b> | <p>data <b>world</b></p> | Nest properly. | HTML |
print('result') | print('result') | Correct. | R |
if [ $foo = 50 ]; then | if [ "$foo" = 50 ]; then | Quote variable. | Shell |
WHERE name = '70' | WHERE name = 70 | Don't quote integer. | SQL |
const p:Person = {{name:'data'}}; | const p:Person = {{name:'data', age:63}}; | Add missing property. | TypeScript |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
name: data
age: 12 | name: data
age: 12 | Correct. | YAML |
List(24,73,68) | List(24,73,68) | Correct. | Scala |
while temp > 46
temp -= 1 | while temp > 46:
temp -= 1 | Colon missing after while. | Python |
if val = 86 | if val == 86 | Use ==. | Ruby |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
<input type='text' value='value'> | <input type='text' value='value' name='status'> | Add name attribute. | HTML |
int[] values = new int[95];
values[95] = 5; | int[] values = new int[95];
if (95 < values.length) values[95] = 5; | Check bounds. | Java |
[x*x for x in data if x > 27] | [x*x for x in data if x > 27] | Correct list comprehension. | Python |
match x {{ 1 => {{}} }} | match x {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
test | test() | Add parentheses. | Kotlin |
<div color=red> | <div style='color:red;'> | Use style attribute. | CSS |
$arr[39] | if ($arr.Count -gt 39) {{ $arr[39] }} | Check bounds. | PowerShell |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
SELECT age email FROM items; | SELECT age, email FROM items; | Add comma. | SQL |
if a = 4 | if a == 4 | Use ==. | Go |
<hr></hr> | <hr> | Self-closing. | HTML |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
if foo = 73: | if foo == 73: | Use == for comparison. | Python |
let val: i32 = "test"; | let val: &str = "test"; | Type mismatch. | Rust |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
var c int = 'test' | var c string = 'test' | Type mismatch. | Go |
<note><age>world</age><name>85</name></note | <note><age>world</age><name>85</name></note> | Add closing >. | XML |
<table><tr><td>data<td>world</tr></table> | <table><tr><td>data</td><td>world</td></tr></table> | Close td. | HTML |
{ "name": "hello" } | { "name": "hello" } | Correct. | JSON |
if (a = 14) | if (a == 14) | Use ==. | R |
var x int | var x int | Correct. | Go |
<img src='output.jpg'> | <img src='output.jpg' alt='desc'> | Add alt text. | HTML |
function bar(x:string){{return x;}} bar(49); | function bar(x:string){{return x;}} bar('test'); | Pass correct type. | TypeScript |
int count = 'world'; | String count = 'world'; | Type mismatch. | Dart |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.