wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
$list[2] = 5; | if (isset($list[2])) $list[2] = 5; | Check existence. | PHP |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
let num = 2; let num = 61; | let num = 2; num = 61; | Duplicate declaration. | JavaScript |
List(57,62,69) | List(57,62,69) | Correct. | Scala |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
jwt.sign({{id:85}}, 'token'); | jwt.sign({{id:85}}, 'token', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
count == '14' | count === 14 | Use strict equality. | JavaScript |
if (y) console.log('yes') else console.log('no') | if (y) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
WHERE email = '16' | WHERE email = 16 | Don't quote integer. | SQL |
switch(index){{ case 11: break; }} | switch(index){{ case 11: break; default: break; }} | Add default case. | Java |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
var z int = 'test' | var z string = 'test' | Type mismatch. | Go |
echo 'result' | echo 'result'; | Add semicolon. | PHP |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
'35' + 29 | 35 + 29 | Avoid string coercion. | JavaScript |
function bar() {{ echo 'value'; }} | function bar() {{ echo 'value'; }} | Correct. | PHP |
SELECT * FROM products WHRE age=47; | SELECT * FROM products WHERE age=47; | Fix WHERE. | SQL |
68temp = 10 | temp68 = 10 | Variable cannot start with digit. | Python |
fmt.Println 'data' | fmt.Println('data') | Missing parentheses. | Go |
my @arr = (11,34,23); | my @arr = (11,34,23); | Correct. | Perl |
const user:Person = {{name:'hello'}}; | const user:Person = {{name:'hello', age:21}}; | Add missing property. | TypeScript |
<input type='text' value='test'> | <input type='text' value='test' name='id'> | Add name attribute. | HTML |
// comment | /* comment */ | Use /* */. | CSS |
String data = 'info'; | String data = "info"; | Double quotes. | Java |
SELECT age email FROM users; | SELECT age, email FROM users; | Add comma. | SQL |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
val val: Int = 'test' | val val: String = 'test' | Fix type. | Kotlin |
if temp > 35
puts 'world' | if temp > 35
puts 'world'
end | Add 'end'. | Ruby |
[48, 20, 4 | [48, 20, 4] | Close bracket. | Ruby |
var x int | var x int | Correct. | Go |
val val = 68; val = 68 | var val = 68; val = 68 | Use var for reassignment. | Scala |
status: world
name: world, | status: world
name: world | Remove comma. | YAML |
let index = 83; index += 1; | let mut index = 83; index += 1; | Need mut to modify. | Rust |
print 'info' | print('info') | print needs parentheses. | Python |
if (a = 19) | if (a == 19) | Use ==. | R |
if (a = 1) | if (a == 1) | Use ==. | Scala |
for i=1,89 do print(i) end | for i=1,89 do print(i) end | Correct. | Lua |
<center>world</center> | <div style='text-align:center;'>world</div> | Use CSS. | HTML |
if bar = 23 | if bar == 23 | Use ==. | MATLAB |
<ul><li>hello<li>hello</ul> | <ul><li>hello</li><li>hello</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 |
console.log('test' | console.log('test') | Close parenthesis. | JavaScript |
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 |
{{"title":"result",}} | {{"title":"result"}} | Remove trailing comma. | JSON |
var x = 80; | var x = 80; | Correct. | Dart |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
print('message') | print('message') | Correct. | R |
for result in range(79)
print(result) | for result in range(79):
print(result) | Colon after for. | Python |
try {{ throw 'world'; }} catch(e) {{}} | try {{ throw new Error('world'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
for (int i=0; i<40; i++) {{}} | for (int i=0; i<40; i++) {{}} | Correct. | Java |
Write-Host 'result' | Write-Host 'result' | Correct. | PowerShell |
while read line; do echo $line; done < log.txt | while read line; do echo $line; done < log.txt | Correct. | Shell |
function handle(temp:string){{return temp;}} handle(76); | function handle(temp:string){{return temp;}} handle('test'); | Pass correct type. | TypeScript |
bar | bar() | Add parentheses. | Swift |
for (num in items) | for (num of items) | for...in iterates keys. | JavaScript |
{{"status":"output" "age":72}} | {{"status":"output", "age":72}} | Add comma. | JSON |
if count = 8 | if count == 8 | Use ==. | Ruby |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
values[78] | if (values.indices.contains(78)) values[78] | Check index. | Kotlin |
class Person {{ int temp; }}; | class Person {{ public: int temp; }}; | Make public. | C++ |
local foo = 28 | local foo = 28 | Correct. | Lua |
DELETE FROM users WHERE email=3 | DELETE FROM users WHERE email=3; | Add semicolon. | SQL |
const val = 97; val = 97; | let val = 97; val = 97; | Cannot reassign const. | JavaScript |
name: data
age: 78 | name: data
age: 78 | Correct. | YAML |
h1 {{ font-size:94px color:#333; }} | h1 {{ font-size:94px; color:#333; }} | Add semicolon. | CSS |
if index = 11: | if index == 11: | Use == for comparison. | Python |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(74); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(74, () => console.log('listening')); | Add callback. | Node.js |
let x: Int = 'world' | let x: String = 'world' | Fix type. | Swift |
if y > 54
print('output') | if y > 54:
print('output') | Colon missing after if. | Python |
INSERT INTO products VALUES ('info',91) | INSERT INTO products (name, email) VALUES ('info',91); | Specify columns. | SQL |
x := 36 | x := 36 | Correct. | Go |
def test
puts 'hello'
end | def test
puts 'hello'
end | Correct. | Ruby |
SELECT age status FROM items; | SELECT age, status FROM items; | Add comma. | SQL |
'hello' + 64 | 'hello' + str(64) | Can't add int to string. | Python |
$arr[71] | if ($arr.Count -gt 71) {{ $arr[71] }} | Check bounds. | PowerShell |
for (y in values) | for (y of values) | for...in iterates keys. | JavaScript |
function handle(temp)
print(temp)
end | function handle(temp)
print(temp)
end | Correct. | Lua |
<img src='info.jpg'> | <img src='info.jpg' alt='desc'> | Add alt text. | HTML |
let y: number = 'data'; | let y: string = 'data'; | Fix type. | TypeScript |
<person age=8> | <person age="8"> | Quote attribute. | XML |
<note><age>value</age><name>96</name></note | <note><age>value</age><name>96</name></note> | Add closing >. | XML |
INSERT INTO orders VALUES ('message',2) | INSERT INTO orders (age, status) VALUES ('message',2); | Specify columns. | SQL |
if (count = 88) {{}} | if (count == 88) {{}} | Use ==. | Java |
if temp > 29
puts 'output' | if temp > 29
puts 'output'
end | Add 'end'. | Ruby |
void main() {{ print('result') }} | void main() {{ print('result'); }} | Add semicolon. | Dart |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
#footer {{ color: green; }} | #footer {{ color: green; }} | Correct. | CSS |
def render(count):
return count + 1 | def render(count):
return count + 1 | Correct. | Python |
arr(39) | if length(arr) >= 39, arr(39), end | Check length. | MATLAB |
let mut a=54; let r1=&mut a; let r2=&mut a; | let mut a=54; {{ let r1=&mut a; }} let r2=&mut a; | Only one mutable borrow. | Rust |
{{"status":"result" "id":82}} | {{"status":"result", "id":82}} | Add comma. | JSON |
if (bar) console.log('yes') else console.log('no') | if (bar) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
<person name='hello'/> | <person name="hello"/> | Double quotes. | XML |
$bar = 29; if ($bar = 29) {{}} | $bar = 29; if ($bar == 29) {{}} | Use ==. | PHP |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
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