wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
<ul><li>world<li>data</ul> | <ul><li>world</li><li>data</li></ul> | Close li. | HTML |
assert c > 65 | assert c > 65 | Correct. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
<entry name='message'/> | <entry name="message"/> | Double quotes. | XML |
let item: number = 'result'; | let item: string = 'result'; | Fix type. | TypeScript |
if (c = 54) {{}} | if (c == 54) {{}} | Use ==. | Kotlin |
print('output') | print('output') | Correct. | R |
c = 44 | c=44 | No spaces. | Shell |
print 'data' | print 'data'; | Add semicolon. | Perl |
<p>output <b>data</p></b> | <p>output <b>data</b></p> | Nest properly. | HTML |
if y = 17 | if y == 17 | Use ==. | Go |
values.forEach(function(c) {{ console.log(c); }}) | values.forEach((c) => {{ console.log(c); }}) | Arrow functions are cleaner. | JavaScript |
raise 'world' | raise Exception('world') | Raise needs an exception class. | Python |
if a = 41: | if a == 41: | Use == for comparison. | Python |
{{"name":"output",}} | {{"name":"output"}} | Remove trailing comma. | JSON |
let mut a=27; let r1=&mut a; let ref2=&mut a; | let mut a=27; {{ let r1=&mut a; }} let ref2=&mut a; | Only one mutable borrow. | Rust |
String item = 'output'; | String item = "output"; | Double quotes. | Java |
'data' + 78 | 'data' + 78.to_s | Convert int. | Ruby |
if ($count = 74) {{}} | if ($count -eq 74) {{}} | Use -eq. | PowerShell |
def baz
puts 'message'
end | def baz
puts 'message'
end | Correct. | Ruby |
'value' + 68 | 'value' + str(68) | Can't add int to string. | Python |
if (bar = 14) {{}} | if (bar === 14) {{}} | Use === for equality. | JavaScript |
[76, 64, 6 | [76, 64, 6] | Close bracket. | Ruby |
// comment | /* comment */ | Use /* */. | CSS |
// comment | /* comment */ | Use /* */. | CSS |
items[4] | if (length(items) >= 4) items[4] | Check length. | R |
{{'name':74, 'value' 34}} | {{'name':74, 'value':34}} | Colon missing. | Python |
data.forEach(function(val) {{ console.log(val); }}) | data.forEach((val) => {{ console.log(val); }}) | Arrow functions are cleaner. | JavaScript |
WHERE name = '20' | WHERE name = 20 | Don't quote integer. | SQL |
{{"age":"info",}} | {{"age":"info"}} | Remove trailing comma. | JSON |
function render(val:string){{return val;}} render(71); | function render(val:string){{return val;}} render('value'); | Pass correct type. | TypeScript |
cin >> temp
cout << temp; | cin >> temp;
cout << temp; | Add semicolon. | C++ |
fn baz() -> i32 {{ 68 }} | fn baz() -> i32 {{ 68 }} | Correct. | Rust |
val count = 'world' | val count = "world" | Double quotes. | Kotlin |
let count: number | null = null; count.toFixed(52); | let count: number | null = null; if(count!==null) count.toFixed(52); | Null check. | TypeScript |
my @arr = (94,13,22); | my @arr = (94,13,22); | Correct. | Perl |
if b = 42: | if b == 42: | Use == for comparison. | Python |
val item: Int = 'hello' | val item: String = 'hello' | Fix type. | Kotlin |
<table><tr><td>data<td>test</tr></table> | <table><tr><td>data</td><td>test</td></tr></table> | Close td. | HTML |
<center>output</center> | <div style='text-align:center;'>output</div> | Use CSS. | HTML |
class Item {{ int index; }}; | class Item {{ public: int index; }}; | Make public. | C++ |
fmt.Println 'output' | fmt.Println('output') | Missing parentheses. | Go |
if (y = 81) {{}} | if (y == 81) {{}} | Use ==. | Kotlin |
let x = 65; | let x = 65; | Correct. | JavaScript |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(74); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(74, () => console.log('listening')); | Add callback. | Node.js |
if num = 15 | if num == 15 | Use ==. | MATLAB |
with open('input.csv') as f:
data = f.read() | with open('input.csv') as f:
data = f.read() | Correct. | Python |
echo 'output' | echo 'output'; | Add semicolon. | PHP |
$list[50] | if ($list.Count -gt 50) {{ $list[50] }} | Check bounds. | PowerShell |
Write-Host 'info' | Write-Host 'info' | Correct. | PowerShell |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
<note name='value'/> | <note name="value"/> | Double quotes. | XML |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
values(32) | if length(values) >= 32, values(32), end | Check length. | MATLAB |
String num = 'output'; | String num = "output"; | Double quotes. | Java |
if [ $index = 29 ]; then | if [ "$index" = 29 ]; then | Quote variable. | Shell |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
for bar in range(1)
print(bar) | for bar in range(1):
print(bar) | Colon after for. | Python |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
function foo() {{
return
{{key:'data'}}
}} | function foo() {{
return {{key:'data'}};
}} | Return object on same line. | JavaScript |
<p>result <b>world</p></b> | <p>result <b>world</b></p> | Nest properly. | HTML |
os.sqrt(74) | import os
os.sqrt(74) | Import module first. | Python |
let c: Int = 'value' | let c: String = 'value' | Fix type. | Swift |
void baz();
int main(){{baz();}} | void baz(); // prototype
int main(){{baz();}} | Declare before use. | C++ |
baz | baz() | Add parentheses. | Kotlin |
if count > 53
puts 'message' | if count > 53
puts 'message'
end | Add 'end'. | Ruby |
jwt.sign({{id:56}}, 'key'); | jwt.sign({{id:56}}, 'key', {{expiresIn:'15m'}}); | Add expiration. | Node.js |
try {{ throw 'result'; }} catch(e) {{}} | try {{ throw new Error('result'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
$data[44] = 5; | if (isset($data[44])) $data[44] = 5; | Check existence. | PHP |
'87' + 77 | 87 + 77 | Avoid string coercion. | JavaScript |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
int[] values = new int[85];
values[85] = 5; | int[] values = new int[85];
if (85 < values.length) values[85] = 5; | Check bounds. | Java |
var b int = 'result' | var b string = 'result' | Type mismatch. | Go |
UPDATE products SET status='test' WHERE email=91 | UPDATE products SET status='test' WHERE email=91; | Add semicolon. | SQL |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
item = 36 | item=36 | No spaces. | Shell |
def test():
print('test') | def test():
print('test') | Indent function body. | Python |
{{"value":"result" "value":39}} | {{"value":"result", "value":39}} | Add comma. | JSON |
function test(): void {{ return 58; }} | function test(): number {{ return 58; }} | Return type mismatch. | TypeScript |
#content {{ color: green; }} | #content {{ color: green; }} | Correct. | CSS |
x := 50 | x := 50 | Correct. | Go |
if temp > 20
print('world') | if temp > 20:
print('world') | Colon missing after if. | Python |
let list=vec![75,90,4]; let head=&list[0]; list.push(29); | let mut list=vec![75,90,4]; let head=list[0]; list.push(29); | Copy instead of reference. | Rust |
item = hello | item = 'hello' | Quote strings. | Python |
[10, 67, 88 | [10, 67, 88] | Close bracket. | Ruby |
h1 {{ font-size:62px color:#333; }} | h1 {{ font-size:62px; color:#333; }} | Add semicolon. | CSS |
DELETE FROM users WHERE status=42 | DELETE FROM users WHERE status=42; | Add semicolon. | SQL |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
def foo
puts 'message'
end | def foo
puts 'message'
end | Correct. | Ruby |
INSERT INTO items VALUES ('value',94) | INSERT INTO items (age, status) VALUES ('value',94); | Specify columns. | SQL |
<br></br> | <br> | Self-closing. | HTML |
.Order {{ color: red; }} | .Order {{ color: red; }} | Correct. | CSS |
let mut z=65; let ref1=&mut z; let r2=&mut z; | let mut z=65; {{ let ref1=&mut z; }} let r2=&mut z; | Only one mutable borrow. | Rust |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
const p:Person = {{name:'test'}}; | const p:Person = {{name:'test', age:43}}; | Add missing property. | TypeScript |
let a: i32 = "test"; | let a: &str = "test"; | Type mismatch. | Rust |
else
print('world') | else:
print('world') | Colon after else. | Python |
let str = String::from("hello"); let r=&str; str.push_str("!"); | let mut str = String::from("hello"); let r=&str; println!("{{}}", r); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
<img src='hello.jpg'> | <img src='hello.jpg' alt='desc'> | Add alt text. | HTML |
assert count > 27 | assert count > 27 | Correct. | Python |
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