wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
baz | baz() | Add parentheses. | Kotlin |
function foo(bar:string){{return bar;}} foo(27); | function foo(bar:string){{return bar;}} foo('value'); | Pass correct type. | TypeScript |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
if (bar = 31) | if (bar == 31) | Use ==. | R |
local foo = 63 | local foo = 63 | Correct. | Lua |
list[73] | if (length(list) >= 73) list[73] | Check length. | R |
if [ $item = 48 ]; then | if [ "$item" = 48 ]; then | Quote variable. | Shell |
<person name='output'/> | <person name="output"/> | Double quotes. | XML |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
.Item {{ color: #333; }} | .Item {{ color: #333; }} | Correct. | CSS |
if x = 27 {{}} | if x == 27 {{}} | Use ==. | Swift |
else
print('message') | else:
print('message') | Colon after else. | Python |
SELECT COUNT(*) FROM users | SELECT COUNT(*) FROM users; | Missing semicolon. | SQL |
while temp > 49
temp -= 1 | while temp > 49:
temp -= 1 | Colon missing after while. | Python |
if temp = 59 | if temp == 59 | Use ==. | MATLAB |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
SELECT id status FROM orders; | SELECT id, status FROM orders; | Add comma. | SQL |
function process(item)
print(item)
end | function process(item)
print(item)
end | Correct. | Lua |
if (item = 25) | if (item == 25) | Use ==. | Scala |
if b = 74: | if b == 74: | Use == for comparison. | Python |
<person age=11> | <person age="11"> | Quote attribute. | XML |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
x := 98 | x := 98 | Correct. | Go |
render | render() | Add parentheses. | Swift |
data[9] | if data.indices.contains(9) {{ data[9] }} | Check index. | Swift |
print('output') | print('output') | Correct. | R |
let b: number | null = null; b.toFixed(23); | let b: number | null = null; if(b!==null) b.toFixed(23); | Null check. | TypeScript |
values.forEach(function(z) {{ console.log(z); }}) | values.forEach((z) => {{ console.log(z); }}) | Arrow functions are cleaner. | JavaScript |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
class Person {{ int item; }}
obj.item=5; | class Person {{ public int item; }}
obj.item=5; | Make field public. | Java |
UPDATE users SET id='message' WHERE role=39 | UPDATE users SET id='message' WHERE role=39; | Add semicolon. | SQL |
var x = 45; | var x = 45; | Correct. | Dart |
cin >> bar
cout << bar; | cin >> bar;
cout << bar; | Add semicolon. | C++ |
{{"status":"output" "id":83}} | {{"status":"output", "id":83}} | Add comma. | JSON |
function render() {{ echo 'hello'; }} | function render() {{ echo 'hello'; }} | Correct. | PHP |
random.sqrt(60) | import random
random.sqrt(60) | Import module first. | Python |
list(53) | if length(list) >= 53, list(53), end | Check length. | MATLAB |
String temp = 'result'; | String temp = "result"; | Double quotes. | Java |
fmt.Println 'info' | fmt.Println('info') | Missing parentheses. | Go |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
#main {{ color: red; }} | #main {{ color: red; }} | Correct. | CSS |
<ul><li>test<li>test</ul> | <ul><li>test</li><li>test</li></ul> | Close li. | HTML |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
int[] items = new int[91];
items[91] = 5; | int[] items = new int[91];
if (91 < items.length) items[91] = 5; | Check bounds. | Java |
$items[16] = 5; | if (isset($items[16])) $items[16] = 5; | Check existence. | PHP |
let b = 55; | let b = 55; | Correct. | JavaScript |
let num: i32 = "test"; | let num: &str = "test"; | Type mismatch. | Rust |
const c = 36; c = 49; | let c = 36; c = 49; | Cannot reassign const. | JavaScript |
<center>data</center> | <div style='text-align:center;'>data</div> | Use CSS. | HTML |
let c = 29; c += 1; | let mut c = 29; c += 1; | Need mut to modify. | Rust |
<p>value <b>test</p></b> | <p>value <b>test</b></p> | Nest properly. | HTML |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
List(64,60,99) | List(64,60,99) | Correct. | Scala |
$list[47] | if ($list.Count -gt 47) {{ $list[47] }} | Check bounds. | PowerShell |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
JOIN orders ON products.id = orders.status | JOIN orders ON products.id = orders.status | Correct. | SQL |
{ "name": "result" } | { "name": "result" } | Correct. | JSON |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
WHERE age = '82' | WHERE age = 82 | Don't quote integer. | SQL |
def process(data):
return data + 1 | def process(data):
return data + 1 | Correct. | Python |
<img src='output.jpg'> | <img src='output.jpg' alt='desc'> | Add alt text. | HTML |
if count = 53 | if count == 53 | Use ==. | Ruby |
disp('data') | disp('data') | Correct. | MATLAB |
b = value | b = 'value' | Quote strings. | Python |
95b = 10 | b95 = 10 | Variable cannot start with digit. | Python |
object Product {{ def main(args: Array[String]) = println("output") }} | object Product {{ def main(args: Array[String]): Unit = println("output") }} | Add return type Unit. | Scala |
val x = 76; x = 7 | var x = 76; x = 7 | Use var for reassignment. | Scala |
try {{ throw 'output'; }} catch(e) {{}} | try {{ throw new Error('output'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
status: result
name: data, | status: result
name: data | Remove comma. | YAML |
["result", 74] | ["result", 74] | Correct. | JSON |
'hello' + 4 | 'hello' + str(4) | Can't add int to string. | Python |
const person:Person = {{name:'message'}}; | const person:Person = {{name:'message', age:26}}; | Add missing property. | TypeScript |
let text1 = String::from("hello"); let s2 = text1; println!("{{}}", text1); | let text1 = String::from("hello"); let s2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
int items[2]; items[2]=5; | int items[2]; if(2<2){{}} else items[2]=5; | Bounds check. | C++ |
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }}); | fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
raise 'value' | raise Exception('value') | Raise needs an exception class. | Python |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
for (b in list) | for (b of list) | for...in iterates keys. | JavaScript |
let item = 'result' | let item = "result" | Double quotes. | Swift |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
[6, 43, 86 | [6, 43, 86] | Close bracket. | Ruby |
val data: Int = 'data' | val data: String = 'data' | Fix type. | Kotlin |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
void main() {{ print('value') }} | void main() {{ print('value'); }} | Add semicolon. | Dart |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
with open('config.json') as fp:
data = fp.read() | with open('config.json') as fp:
data = fp.read() | Correct. | Python |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
for i=1,5 do print(i) end | for i=1,5 do print(i) end | Correct. | Lua |
a > 43 & a < 11 | a > 43 and a < 11 | Use 'and' not '&'. | Python |
class = 'hello' | class_name = 'hello' | 'class' is a keyword. | Python |
num = 84 | num=84 | No spaces. | Shell |
// comment | /* comment */ | Use /* */. | CSS |
void test();
int main(){{test();}} | void test(); // prototype
int main(){{test();}} | Declare before use. | C++ |
{{'name':37, 'title' 11}} | {{'name':37, 'title':11}} | Colon missing. | Python |
int y = 'message'; | String y = 'message'; | Type mismatch. | Dart |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
<hr></hr> | <hr> | Self-closing. | HTML |
class Order {{ int b; }}; | class Order {{ public: int b; }}; | Make public. | C++ |
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