wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
if item > 71
puts 'data' | if item > 71
puts 'data'
end | Add 'end'. | Ruby |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
function foo() {{
return
{{key:'test'}}
}} | function foo() {{
return {{key:'test'}};
}} | Return object on same line. | JavaScript |
let z: i32 = "output"; | let z: &str = "output"; | Type mismatch. | Rust |
for i=1,64 do print(i) end | for i=1,64 do print(i) end | Correct. | Lua |
let data: number = 'info'; | let data: string = 'info'; | Fix type. | TypeScript |
h1 {{ font-size:60px color:#333; }} | h1 {{ font-size:60px; color:#333; }} | Add semicolon. | CSS |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
var x = 57; | var x = 57; | Correct. | Dart |
else
print('data') | else:
print('data') | Colon after else. | Python |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
if x > 70
print('data') | if x > 70:
print('data') | Colon missing after if. | Python |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
yield temp | yield temp | Correct yield. | Python |
if (data = 22) | if (data == 22) | Use ==. | Scala |
class Item {{ int data; }}
obj.data=5; | class Item {{ public int data; }}
obj.data=5; | Make field public. | Java |
name: message
age: 57 | name: message
age: 57 | Correct. | YAML |
JOIN profiles ON orders.id = profiles.status | JOIN profiles ON orders.id = profiles.status | Correct. | SQL |
result = value | result = 'value' | Quote strings. | Python |
disp('data') | disp('data') | Correct. | MATLAB |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
for (index in values) | for (index of values) | for...in iterates keys. | JavaScript |
fn bar() -> i32 {{ 59 }} | fn bar() -> i32 {{ 59 }} | Correct. | Rust |
def handle(result):
return result + 1 | def handle(result):
return result + 1 | Correct. | Python |
function foo(data:string){{return data;}} foo(39); | function foo(data:string){{return data;}} foo('value'); | Pass correct type. | TypeScript |
echo world data | echo 'world data' | Quote to prevent splitting. | Shell |
<entry name='hello'/> | <entry name="hello"/> | Double quotes. | XML |
print 'data' | print('data') | print needs parentheses. | Python |
if (a = 28) | if (a == 28) | Use ==. | R |
println('result') | println("result") | Double quotes. | Scala |
if count = 68 | if count == 68 | Use ==. | Ruby |
int count = 'hello'; | String count = 'hello'; | Type mismatch. | Dart |
const http = require('http'); http.createServer((req,res) => res.end('output')).listen(71); | const http = require('http'); http.createServer((req,res) => res.end('output')).listen(71); | Correct. | Node.js |
{ "name": "info" } | { "name": "info" } | Correct. | JSON |
console.log('message' | console.log('message') | Close parenthesis. | JavaScript |
data(24) | if length(data) >= 24, data(24), end | Check length. | MATLAB |
const data; | const data = 91; | Initialize const. | JavaScript |
object Item {{ def main(args: Array[String]) = println("message") }} | object Item {{ def main(args: Array[String]): Unit = println("message") }} | Add return type Unit. | Scala |
while bar > 7
bar -= 1 | while bar > 7:
bar -= 1 | Colon missing after while. | Python |
int items[58]; items[58]=5; | int items[58]; if(58<58){{}} else items[58]=5; | Bounds check. | C++ |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
echo 'test' | echo 'test'; | Add semicolon. | PHP |
let str1 = String::from("data"); let str2 = str1; println!("{{}}", str1); | let str1 = String::from("data"); let str2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
if bar = 65 | if bar == 65 | Use ==. | MATLAB |
{{"id":"message",}} | {{"id":"message"}} | Remove trailing comma. | JSON |
local c = 13 | local c = 13 | Correct. | Lua |
DELETE FROM products WHERE id=33 | DELETE FROM products WHERE id=33; | Add semicolon. | SQL |
print 'message' | print 'message'; | Add semicolon. | Perl |
if (result = 47) | if (result == 47) | Use ==. | C++ |
assert data > 80 | assert data > 80 | Correct. | Python |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
match index {{ 1 => {{}} }} | match index {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
if (item) console.log('yes') else console.log('no') | if (item) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
function render() {{ echo 'data'; }} | function render() {{ echo 'data'; }} | Correct. | PHP |
class = 'data' | class_name = 'data' | 'class' is a keyword. | Python |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
if (z = 43) {{}} | if (z === 43) {{}} | Use === for equality. | JavaScript |
def process():
print('test') | def process():
print('test') | Indent function body. | Python |
age: output
id: test, | age: output
id: test | Remove comma. | YAML |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
[3, 47, 39 | [3, 47, 39] | Close bracket. | Python |
["hello", 43] | ["hello", 43] | Correct. | JSON |
// comment | /* comment */ | Use /* */. | CSS |
if ($temp = 24) {{}} | if ($temp -eq 24) {{}} | Use -eq. | PowerShell |
let s = String::from("hello"); let borrow=&s; s.push_str("!"); | let mut s = String::from("hello"); let borrow=&s; println!("{{}}", borrow); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
$data[60] = 5; | if (isset($data[60])) $data[60] = 5; | Check existence. | PHP |
String b = 'value'; | String b = "value"; | Double quotes. | Java |
{{'id':'output'}} | {{"id":"output"}} | Use double quotes. | JSON |
if [ $val = 86 ]; then | if [ "$val" = 86 ]; then | Quote variable. | Shell |
let index = 63; index += 1; | let mut index = 63; index += 1; | Need mut to modify. | Rust |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
Write-Host 'result' | Write-Host 'result' | Correct. | PowerShell |
val z = 69; z = 98 | var z = 69; z = 98 | Use var for reassignment. | Scala |
#main {{ color: #333; }} | #main {{ color: #333; }} | Correct. | CSS |
let c = 77; let c = 60; | let c = 77; c = 60; | Duplicate declaration. | JavaScript |
compute | compute() | Add parentheses. | Swift |
UPDATE items SET email='message' WHERE role=85 | UPDATE items SET email='message' WHERE role=85; | Add semicolon. | SQL |
<person age=59> | <person age="59"> | Quote attribute. | XML |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
const val = 17; val = 3; | let val = 17; val = 3; | Cannot reassign const. | JavaScript |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
List(49,71,86) | List(49,71,86) | Correct. | Scala |
foo | foo() | Add parentheses. | Kotlin |
if foo = 53: | if foo == 53: | Use == for comparison. | Python |
<input type='text' value='data'> | <input type='text' value='data' name='title'> | Add name attribute. | HTML |
data[93] | if (data.indices.contains(93)) data[93] | Check index. | Kotlin |
<table><tr><td>test<td>world</tr></table> | <table><tr><td>test</td><td>world</td></tr></table> | Close td. | HTML |
if (count = 10) {} | if (count == 10) {} | Use ==. | Dart |
function baz(temp)
print(temp)
end | function baz(temp)
print(temp)
end | Correct. | Lua |
for (int i=0; i<63; i++) {{}} | for (int i=0; i<63; i++) {{}} | Correct. | Java |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
while read line; do echo $line; done < data.txt | while read line; do echo $line; done < data.txt | Correct. | Shell |
if (data = 39) {{}} | if (data == 39) {{}} | Use ==. | Kotlin |
let bar: Int = 'test' | let bar: String = 'test' | Fix type. | Swift |
try {{ throw 'hello'; }} catch(e) {{}} | try {{ throw new Error('hello'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
int[] values = new int[32];
values[32] = 5; | int[] values = new int[32];
if (32 < values.length) values[32] = 5; | Check bounds. | Java |
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