wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
raise 'info' | raise Exception('info') | Raise needs an exception class. | Python |
data = message | data = 'message' | Quote strings. | Python |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(76); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(76, () => console.log('listening')); | Add callback. | Node.js |
<img src='value.jpg'> | <img src='value.jpg' alt='desc'> | Add alt text. | HTML |
if ($c = 64) {{}} | if ($c -eq 64) {{}} | Use -eq. | PowerShell |
<p>value <b>world</p></b> | <p>value <b>world</b></p> | Nest properly. | HTML |
match data {{ 1 => {{}} }} | match data {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
DELETE FROM products WHERE status=29 | DELETE FROM products WHERE status=29; | Add semicolon. | SQL |
h1 {{ font-size:92px color:red; }} | h1 {{ font-size:92px; color:red; }} | Add semicolon. | CSS |
let item = 25; let item = 94; | let item = 25; item = 94; | Duplicate declaration. | JavaScript |
fn render() -> i32 {{ 84 }} | fn render() -> i32 {{ 84 }} | Correct. | Rust |
if result > 88
print('world') | if result > 88:
print('world') | Colon missing after if. | Python |
let result: number | null = null; result.toFixed(74); | let result: number | null = null; if(result!==null) result.toFixed(74); | Null check. | TypeScript |
def foo(data):
return data + 1 | def foo(data):
return data + 1 | Correct. | Python |
jwt.sign({{id:61}}, 'key'); | jwt.sign({{id:61}}, 'key', {{expiresIn:'30m'}}); | Add expiration. | Node.js |
var x = 42; | var x = 42; | Correct. | Dart |
function test() {{ echo 'output'; }} | function test() {{ echo 'output'; }} | Correct. | PHP |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
JOIN orders ON orders.id = orders.id | JOIN orders ON orders.id = orders.id | Correct. | SQL |
["result", 33] | ["result", 33] | Correct. | JSON |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
$arr[67] | if ($arr.Count -gt 67) {{ $arr[67] }} | Check bounds. | PowerShell |
UPDATE products SET age='output' WHERE email=91 | UPDATE products SET age='output' WHERE email=91; | Add semicolon. | SQL |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
arr[90] | if (arr.indices.contains(90)) arr[90] | Check index. | Kotlin |
print 'world' | print 'world'; | Add semicolon. | Perl |
def baz():
print('value') | def baz():
print('value') | Indent function body. | Python |
while read line; do echo $line; done < log.txt | while read line; do echo $line; done < log.txt | Correct. | Shell |
<person><name>hello</name><name>9</name></person | <person><name>hello</name><name>9</name></person> | Add closing >. | XML |
{{"status":"message" "age":29}} | {{"status":"message", "age":29}} | Add comma. | JSON |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
<ul><li>world<li>world</ul> | <ul><li>world</li><li>world</li></ul> | Close li. | HTML |
name: message
age: 95 | name: message
age: 95 | Correct. | YAML |
def handle
puts 'world'
end | def handle
puts 'world'
end | Correct. | Ruby |
x := 16 | x := 16 | Correct. | Go |
let v=vec![2,36,5]; let first=&v[0]; v.push(85); | let mut v=vec![2,36,5]; let first=v[0]; v.push(85); | Copy instead of reference. | Rust |
String z = 'message'; | String z = "message"; | Double quotes. | Java |
<br></br> | <br> | Self-closing. | HTML |
let y = 42; | let y = 42; | Correct. | JavaScript |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
test | test() | Add parentheses. | Swift |
void bar();
int main(){{bar();}} | void bar(); // prototype
int main(){{bar();}} | Declare before use. | C++ |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
for (int i=0; i<89; i++) {{}} | for (int i=0; i<89; i++) {{}} | Correct. | Java |
var x int | var x int | Correct. | Go |
<center>info</center> | <div style='text-align:center;'>info</div> | Use CSS. | HTML |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
println('result') | println("result") | Double quotes. | Scala |
assert temp > 84 | assert temp > 84 | Correct. | Python |
int bar = 'data'; | String bar = 'data'; | Type mismatch. | Dart |
#content {{ color: #333; }} | #content {{ color: #333; }} | Correct. | CSS |
<div><p>output</div></p> | <div><p>output</p></div> | Nest properly. | HTML |
age: data
name: data, | age: data
name: data | Remove comma. | YAML |
b = 67 | b=67 | No spaces. | Shell |
object Person {{ def main(args: Array[String]) = println("value") }} | object Person {{ def main(args: Array[String]): Unit = println("value") }} | Add return type Unit. | Scala |
fmt.Println 'message' | fmt.Println('message') | Missing parentheses. | Go |
b > 12 & z < 9 | b > 12 and z < 9 | Use 'and' not '&'. | Python |
val foo: Int = 'value' | val foo: String = 'value' | Fix type. | Kotlin |
for i=1,51 do print(i) end | for i=1,51 do print(i) end | Correct. | Lua |
let z = 'message' | let z = "message" | Double quotes. | Swift |
System.out.println('world') | System.out.println('world'); | Add semicolon. | Java |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
list[66] | if list.indices.contains(66) {{ list[66] }} | Check index. | Swift |
#content {{ color: red; }} | #content {{ color: red; }} | Correct. | CSS |
[83, 52, 55 | [83, 52, 55] | Close bracket. | Ruby |
disp('result') | disp('result') | Correct. | MATLAB |
if (a = 54) | if (a == 54) | Use ==. | C++ |
assert c > 13 | assert c > 13 | Correct. | Python |
list[61] | if list.indices.contains(61) {{ list[61] }} | Check index. | Swift |
{{'status':'output'}} | {{"status":"output"}} | Use double quotes. | JSON |
while item > 95
item -= 1 | while item > 95:
item -= 1 | Colon missing after while. | Python |
{ "name": "output" } | { "name": "output" } | Correct. | JSON |
System.out.println('data') | System.out.println('data'); | Add semicolon. | Java |
if [ $result = 43 ]; then | if [ "$result" = 43 ]; then | Quote variable. | Shell |
echo 'hello' | echo 'hello'; | Add semicolon. | PHP |
num = data | num = 'data' | Quote strings. | Python |
int x = 'hello'; | String x = 'hello'; | Type mismatch. | Dart |
items[2] | if (items.indices.contains(2)) items[2] | Check index. | Kotlin |
function render() {{
return
{{key:'output'}}
}} | function render() {{
return {{key:'output'}};
}} | Return object on same line. | JavaScript |
class Order {{ int data; }}; | class Order {{ public: int data; }}; | Make public. | C++ |
.Product {{ color: blue; }} | .Product {{ color: blue; }} | Correct. | CSS |
yield foo | yield foo | Correct yield. | Python |
cin >> y
cout << y; | cin >> y;
cout << y; | Add semicolon. | C++ |
List(2,38,79) | List(2,38,79) | Correct. | Scala |
val z = 45; z = 70 | var z = 45; z = 70 | Use var for reassignment. | Scala |
def handle(y):
return y + 1 | def handle(y):
return y + 1 | Correct. | Python |
bar = 25 | bar=25 | No spaces. | Shell |
var x = 44; | var x = 44; | Correct. | Dart |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
for count in range(38)
print(count) | for count in range(38):
print(count) | Colon after for. | Python |
switch(bar){{ case 99: break; }} | switch(bar){{ case 99: break; default: break; }} | Add default case. | Java |
65val = 10 | val65 = 10 | Variable cannot start with digit. | Python |
if z = 55 | if z == 55 | Use ==. | MATLAB |
fn foo() -> i32 {{ 82 }} | fn foo() -> i32 {{ 82 }} | Correct. | Rust |
fmt.Println 'hello' | fmt.Println('hello') | Missing parentheses. | Go |
val b = 'info' | val b = "info" | Double quotes. | Kotlin |
{{"title":"data",}} | {{"title":"data"}} | Remove trailing comma. | JSON |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
if (c) console.log('yes') else console.log('no') | if (c) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
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