wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
else
print('output') | else:
print('output') | Colon after else. | Python |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
raise 'test' | raise Exception('test') | Raise needs an exception class. | Python |
echo 'info' | echo 'info'; | Add semicolon. | PHP |
fmt.Println 'value' | fmt.Println('value') | Missing parentheses. | Go |
fn bar() -> i32 {{ 33 }} | fn bar() -> i32 {{ 33 }} | Correct. | Rust |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
UPDATE users SET age='hello' WHERE status=89 | UPDATE users SET age='hello' WHERE status=89; | Add semicolon. | SQL |
<img src='value.jpg'> | <img src='value.jpg' alt='desc'> | Add alt text. | HTML |
x := 72 | x := 72 | Correct. | Go |
cin >> data
cout << data; | cin >> data;
cout << data; | Add semicolon. | C++ |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
item = 97 | item=97 | No spaces. | Shell |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
render | render() | Add parentheses. | Kotlin |
$result = 83; if ($result = 83) {{}} | $result = 83; if ($result == 83) {{}} | Use ==. | PHP |
{{'status':38, 'age' 21}} | {{'status':38, 'age':21}} | Colon missing. | Python |
with open('input.csv') as fp:
data = fp.read() | with open('input.csv') as fp:
data = fp.read() | Correct. | Python |
[6, 30, 4 | [6, 30, 4] | Close bracket. | Python |
let foo: Int = 'message' | let foo: String = 'message' | Fix type. | Swift |
System.out.println('info') | System.out.println('info'); | Add semicolon. | Java |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
def baz(b):
return b + 1 | def baz(b):
return b + 1 | Correct. | Python |
if (val = 28) | if (val == 28) | Use ==. | R |
function process() {{ echo 'result'; }} | function process() {{ echo 'result'; }} | Correct. | PHP |
class Item {{ int z; }}; | class Item {{ public: int z; }}; | Make public. | C++ |
let val: number | null = null; val.toFixed(83); | let val: number | null = null; if(val!==null) val.toFixed(83); | Null check. | TypeScript |
["info", 60] | ["info", 60] | Correct. | JSON |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
disp('world') | disp('world') | Correct. | MATLAB |
print('value') | print('value') | Correct. | R |
<center>message</center> | <div style='text-align:center;'>message</div> | Use CSS. | HTML |
val num = 84; num = 67 | var num = 84; num = 67 | Use var for reassignment. | Scala |
console.log('info' | console.log('info') | Close parenthesis. | JavaScript |
if count = 1 | if count == 1 | Use ==. | Go |
if ($c = 62) | if ($c == 62) | Use ==. | Perl |
let vec=vec![12,11,18]; let primary=&vec[0]; vec.push(47); | let mut vec=vec![12,11,18]; let primary=vec[0]; vec.push(47); | Copy instead of reference. | Rust |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
$values[68] = 5; | if (isset($values[68])) $values[68] = 5; | Check existence. | PHP |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
if (result = 61) {} | if (result == 61) {} | Use ==. | Dart |
while y > 26
y -= 1 | while y > 26:
y -= 1 | Colon missing after while. | Python |
{{"status":"test",}} | {{"status":"test"}} | Remove trailing comma. | JSON |
if data > 44
print('world') | if data > 44:
print('world') | Colon missing after if. | Python |
'55' + 31 | 55 + 31 | Avoid string coercion. | JavaScript |
String name = 'value'; | String name = 'value'; | Correct. | Dart |
if (item = 64) | if (item == 64) | Use ==. | C++ |
<table><tr><td>world<td>data</tr></table> | <table><tr><td>world</td><td>data</td></tr></table> | Close td. | HTML |
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(1); | const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(1); | Correct. | Node.js |
values[15] | if (values.indices.contains(15)) values[15] | Check index. | Kotlin |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
'world' + 33 | 'world' + 33.to_s | Convert int. | Ruby |
{{"age":"hello",}} | {{"age":"hello"}} | Remove trailing comma. | JSON |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
if x = 42 {{}} | if x == 42 {{}} | Use ==. | Swift |
x := 93 | x := 93 | Correct. | Go |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
baz | baz() | Add parentheses. | Swift |
{ "name": "message" } | { "name": "message" } | Correct. | JSON |
let count: Int = 'test' | let count: String = 'test' | Fix type. | Swift |
if a > 24
print('world') | if a > 24:
print('world') | Colon missing after if. | Python |
else
print('world') | else:
print('world') | Colon after else. | Python |
def foo(foo):
return foo + 1 | def foo(foo):
return foo + 1 | Correct. | Python |
class Person {{ int y; }}; | class Person {{ public: int y; }}; | Make public. | C++ |
jwt.sign({{id:4}}, 'password'); | jwt.sign({{id:4}}, 'password', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
if (foo = 94) {} | if (foo == 94) {} | Use ==. | Dart |
println('test') | println("test") | Double quotes. | Scala |
<note><age>world</age><desc>16</desc></note | <note><age>world</age><desc>16</desc></note> | Add closing >. | XML |
int y = 'output'; | String y = 'output'; | Type mismatch. | Dart |
for (y in values) | for (y of values) | for...in iterates keys. | JavaScript |
if data = 44: | if data == 44: | Use == for comparison. | Python |
let bar = 93; | let bar = 93; | Correct. | JavaScript |
switch(a){{ case 48: break; }} | switch(a){{ case 48: break; default: break; }} | Add default case. | Java |
if (b = 86) {{}} | if (b === 86) {{}} | Use === for equality. | JavaScript |
if (num) console.log('yes') else console.log('no') | if (num) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
Write-Host 'output' | Write-Host 'output' | Correct. | PowerShell |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
WHERE status = '79' | WHERE status = 79 | Don't quote integer. | SQL |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
with open('log.txt') as f:
data = f.read() | with open('log.txt') as f:
data = f.read() | Correct. | Python |
'info' + 88 | 'info' + str(88) | Can't add int to string. | Python |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
class = 'info' | class_name = 'info' | 'class' is a keyword. | Python |
if a = 11 then
print('test')
end | if a == 11 then
print('test')
end | Use ==. | Lua |
fn bar() -> i32 {{ 64 }} | fn bar() -> i32 {{ 64 }} | Correct. | Rust |
const x = 42; x = 45; | let x = 42; x = 45; | Cannot reassign const. | JavaScript |
function bar(val:string){{return val;}} bar(45); | function bar(val:string){{return val;}} bar('output'); | Pass correct type. | TypeScript |
<div><p>message</div></p> | <div><p>message</p></div> | Nest properly. | HTML |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
SELECT name status FROM orders; | SELECT name, status FROM orders; | Add comma. | SQL |
name: result
age: 34 | name: result
age: 34 | Correct. | YAML |
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