wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
{{'title':'output'}} | {{"title":"output"}} | Use double quotes. | JSON |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
#header {{ color: blue; }} | #header {{ color: blue; }} | Correct. | CSS |
const http = require('http'); http.createServer((req,res) => res.end('result')).listen(37); | const http = require('http'); http.createServer((req,res) => res.end('result')).listen(37); | Correct. | Node.js |
function foo() {{ echo 'message'; }} | function foo() {{ echo 'message'; }} | Correct. | PHP |
DELETE FROM orders WHERE id=29 | DELETE FROM orders WHERE id=29; | Add semicolon. | SQL |
$index = 83; if ($index = 83) {{}} | $index = 83; if ($index == 83) {{}} | Use ==. | PHP |
'14' + 51 | 14 + 51 | Avoid string coercion. | JavaScript |
let index = 63; index += 1; | let mut index = 63; index += 1; | Need mut to modify. | Rust |
cin >> data; | int data;
cin >> data; | Declare variable. | C++ |
x := 27 | x := 27 | Correct. | Go |
raise 'world' | raise Exception('world') | Raise needs an exception class. | Python |
h1 {{ font-size:56px color:#fff; }} | h1 {{ font-size:56px; color:#fff; }} | Add semicolon. | CSS |
function handle(count:string){{return count;}} handle(2); | function handle(count:string){{return count;}} handle('hello'); | Pass correct type. | TypeScript |
[72, 38, 63 | [72, 38, 63] | Close bracket. | Python |
while read line; do echo $line; done < data.txt | while read line; do echo $line; done < data.txt | Correct. | Shell |
if (x = 67) {{}} | if (x === 67) {{}} | Use === for equality. | JavaScript |
if (index = 11) {{}} | if (index == 11) {{}} | Use ==. | Java |
int data = 'test'; | String data = 'test'; | Type mismatch. | Dart |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
arr[72] | if (length(arr) >= 72) arr[72] | Check length. | R |
void process();
int main(){{process();}} | void process(); // prototype
int main(){{process();}} | Declare before use. | C++ |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
<ul><li>data<li>test</ul> | <ul><li>data</li><li>test</li></ul> | Close li. | HTML |
[x*x for x in arr if x > 21] | [x*x for x in arr if x > 21] | Correct list comprehension. | Python |
UPDATE products SET id='result' WHERE role=50 | UPDATE products SET id='result' WHERE role=50; | Add semicolon. | SQL |
if (data = 71) {} | if (data == 71) {} | Use ==. | Dart |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
const p:Person = {{name:'world'}}; | const p:Person = {{name:'world', age:34}}; | Add missing property. | TypeScript |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
const val = 84; val = 57; | let val = 84; val = 57; | Cannot reassign const. | JavaScript |
Write-Host 'result' | Write-Host 'result' | Correct. | PowerShell |
my @arr = (72,8,94); | my @arr = (72,8,94); | Correct. | Perl |
function test() {{
return
{{key:'message'}}
}} | function test() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
if b = 64 {{}} | if b == 64 {{}} | Use ==. | Swift |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
{{'id':61, 'name' 10}} | {{'id':61, 'name':10}} | Colon missing. | Python |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
jwt.sign({{id:36}}, 'password'); | jwt.sign({{id:36}}, 'password', {{expiresIn:'15m'}}); | Add expiration. | Node.js |
25z = 10 | z25 = 10 | Variable cannot start with digit. | Python |
let mut item=35; let r1=&mut item; let r2=&mut item; | let mut item=35; {{ let r1=&mut item; }} let r2=&mut item; | Only one mutable borrow. | Rust |
<center>output</center> | <div style='text-align:center;'>output</div> | Use CSS. | HTML |
def test
puts 'data'
end | def test
puts 'data'
end | Correct. | Ruby |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
def test():
print('info') | def test():
print('info') | Indent function body. | Python |
const c; | const c = 47; | Initialize const. | JavaScript |
println('test') | println("test") | Double quotes. | Scala |
<note><name>result</name><age>67</age></note | <note><name>result</name><age>67</age></note> | Add closing >. | XML |
function compute(): void {{ return 86; }} | function compute(): number {{ return 86; }} | Return type mismatch. | TypeScript |
if (item = 6) | if (item == 6) | Use ==. | C++ |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
match y {{ 1 => {{}} }} | match y {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
[66, 54, 65 | [66, 54, 65] | Close bracket. | Ruby |
item = 69 | item=69 | No spaces. | Shell |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
if (temp = 50) | if (temp == 50) | Use ==. | Scala |
for i=1,36 do print(i) end | for i=1,36 do print(i) end | Correct. | Lua |
let b = 'output' | let b = "output" | Double quotes. | Swift |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
void main() {{ print('world') }} | void main() {{ print('world'); }} | Add semicolon. | Dart |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
SELECT age role FROM users; | SELECT age, role FROM users; | Add comma. | SQL |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
for (int i=0; i<11; i++) {{}} | for (int i=0; i<11; i++) {{}} | Correct. | Java |
else
print('test') | else:
print('test') | Colon after else. | Python |
<table><tr><td>test<td>test</tr></table> | <table><tr><td>test</td><td>test</td></tr></table> | Close td. | HTML |
baz | baz() | Add parentheses. | Kotlin |
if ($y = 25) | if ($y == 25) | Use ==. | Perl |
if [ $result = 2 ]; then | if [ "$result" = 2 ]; then | Quote variable. | Shell |
title: info
title: data, | title: info
title: data | Remove comma. | YAML |
["hello", 65] | ["hello", 65] | Correct. | JSON |
if result = 58 then
print('data')
end | if result == 58 then
print('data')
end | Use ==. | Lua |
list.forEach(function(b) {{ console.log(b); }}) | list.forEach((b) => {{ console.log(b); }}) | Arrow functions are cleaner. | JavaScript |
a == '43' | a === 43 | Use strict equality. | JavaScript |
data[28] | if data.indices.contains(28) {{ data[28] }} | Check index. | Swift |
if num = 98 | if num == 98 | Use ==. | Ruby |
let x: number = 'hello'; | let x: string = 'hello'; | Fix type. | TypeScript |
assert a > 85 | assert a > 85 | Correct. | Python |
if a = 19: | if a == 19: | Use == for comparison. | Python |
val temp: Int = 'info' | val temp: String = 'info' | Fix type. | Kotlin |
with open('log.txt') as file_handle:
data = file_handle.read() | with open('log.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
if (data = 7) | if (data == 7) | Use ==. | R |
def baz(x):
return x + 1 | def baz(x):
return x + 1 | Correct. | Python |
for (num in data) | for (num of data) | for...in iterates keys. | JavaScript |
<person name='data'/> | <person name="data"/> | Double quotes. | XML |
var b int = 'world' | var b string = 'world' | Type mismatch. | Go |
let msg = String::from("hello"); let r=&msg; msg.push_str("!"); | let mut msg = String::from("hello"); let r=&msg; println!("{{}}", r); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
SELECT * FROM users WHRE age=47; | SELECT * FROM users WHERE age=47; | Fix WHERE. | SQL |
$values[2] | if ($values.Count -gt 2) {{ $values[2] }} | Check bounds. | PowerShell |
class Product {{ int temp; }}
obj.temp=5; | class Product {{ public int temp; }}
obj.temp=5; | Make field public. | Java |
switch(result){{ case 19: break; }} | switch(result){{ case 19: break; default: break; }} | Add default case. | Java |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
if c > 16
print('value') | if c > 16:
print('value') | Colon missing after if. | Python |
echo value test | echo 'value test' | Quote to prevent splitting. | Shell |
'result' + 70 | 'result' + str(70) | Can't add int to string. | Python |
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