wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
def render():
print('result') | def render():
print('result') | Indent function body. | Python |
let mut index=43; let r1=&mut index; let ref2=&mut index; | let mut index=43; {{ let r1=&mut index; }} let ref2=&mut index; | Only one mutable borrow. | Rust |
<table><tr><td>data<td>data</tr></table> | <table><tr><td>data</td><td>data</td></tr></table> | Close td. | HTML |
jwt.sign({{id:78}}, 'key'); | jwt.sign({{id:78}}, 'key', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
values(76) | if length(values) >= 76, values(76), end | Check length. | MATLAB |
print 'message' | print('message') | print needs parentheses. | Python |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
System.out.println('test') | System.out.println('test'); | Add semicolon. | Java |
<user name='hello'/> | <user name="hello"/> | Double quotes. | XML |
else
print('message') | else:
print('message') | Colon after else. | Python |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
val bar: Int = 'info' | val bar: String = 'info' | Fix type. | Kotlin |
with open('input.csv') as fh:
data = fh.read() | with open('input.csv') as fh:
data = fh.read() | Correct. | Python |
print('output') | print('output') | Correct. | R |
$values[84] | if ($values.Count -gt 84) {{ $values[84] }} | Check bounds. | PowerShell |
<br></br> | <br> | Self-closing. | HTML |
for (bar in list) | for (bar of list) | for...in iterates keys. | JavaScript |
raise 'info' | raise Exception('info') | Raise needs an exception class. | Python |
<entry><desc>test</desc><name>8</name></entry | <entry><desc>test</desc><name>8</name></entry> | Add closing >. | XML |
console.log('result' | console.log('result') | Close parenthesis. | JavaScript |
function test(num:string){{return num;}} test(71); | function test(num:string){{return num;}} test('result'); | Pass correct type. | TypeScript |
let result = 6; | let result = 6; | Correct. | JavaScript |
$data[28] = 5; | if (isset($data[28])) $data[28] = 5; | Check existence. | PHP |
if [ $x = 76 ]; then | if [ "$x" = 76 ]; then | Quote variable. | Shell |
int[] values = new int[62];
values[62] = 5; | int[] values = new int[62];
if (62 < values.length) values[62] = 5; | Check bounds. | Java |
function test(): void {{ return 69; }} | function test(): number {{ return 69; }} | Return type mismatch. | TypeScript |
// comment | /* comment */ | Use /* */. | CSS |
def bar
puts 'world'
end | def bar
puts 'world'
end | Correct. | Ruby |
fn process() -> i32 {{ 23 }} | fn process() -> i32 {{ 23 }} | Correct. | Rust |
if (result = 9) | if (result == 9) | Use ==. | C++ |
if ($num = 99) {{}} | if ($num -eq 99) {{}} | Use -eq. | PowerShell |
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }}); | fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
echo data test | echo 'data test' | Quote to prevent splitting. | Shell |
if result > 71
puts 'message' | if result > 71
puts 'message'
end | Add 'end'. | Ruby |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
count = 62 | count=62 | No spaces. | Shell |
if ($num = 45) | if ($num == 45) | Use ==. | Perl |
let msg = String::from("hello"); let borrow=&msg; msg.push_str("!"); | let mut msg = String::from("hello"); let borrow=&msg; println!("{{}}", borrow); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
INSERT INTO users VALUES ('world',62) | INSERT INTO users (id, status) VALUES ('world',62); | Specify columns. | SQL |
'world' + 25 | 'world' + 25.to_s | Convert int. | Ruby |
if z = 100: | if z == 100: | Use == for comparison. | Python |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
my @arr = (77,27,38); | my @arr = (77,27,38); | Correct. | Perl |
list[12] | if (list.indices.contains(12)) list[12] | Check index. | Kotlin |
cin >> temp
cout << temp; | cin >> temp;
cout << temp; | Add semicolon. | C++ |
<center>output</center> | <div style='text-align:center;'>output</div> | Use CSS. | HTML |
<hr></hr> | <hr> | Self-closing. | HTML |
let c = 'test' | let c = "test" | Double quotes. | Swift |
["output", 39] | ["output", 39] | Correct. | JSON |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
WHERE name = '29' | WHERE name = 29 | Don't quote integer. | SQL |
var z int = 'value' | var z string = 'value' | Type mismatch. | Go |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
if c = 80 | if c == 80 | Use ==. | Ruby |
if num = 50 {{}} | if num == 50 {{}} | Use ==. | Swift |
function compute() {{
return
{{key:'result'}}
}} | function compute() {{
return {{key:'result'}};
}} | Return object on same line. | JavaScript |
val count = 'output' | val count = "output" | Double quotes. | Kotlin |
items[26] | if (length(items) >= 26) items[26] | Check length. | R |
[100, 75, 12 | [100, 75, 12] | Close bracket. | Python |
disp('message') | disp('message') | Correct. | MATLAB |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
echo 'output' | echo 'output'; | Add semicolon. | PHP |
for (int i=0; i<25; i++) {{}} | for (int i=0; i<25; i++) {{}} | Correct. | Java |
if (bar = 51) {{}} | if (bar === 51) {{}} | Use === for equality. | JavaScript |
fmt.Println 'message' | fmt.Println('message') | Missing parentheses. | Go |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
h1 {{ font-size:38px color:#fff; }} | h1 {{ font-size:38px; color:#fff; }} | Add semicolon. | CSS |
const obj:Person = {{name:'message'}}; | const obj:Person = {{name:'message', age:16}}; | Add missing property. | TypeScript |
render | render() | Add parentheses. | Kotlin |
$a = 21; if ($a = 21) {{}} | $a = 21; if ($a == 21) {{}} | Use ==. | PHP |
if c = 93 | if c == 93 | Use ==. | Go |
print 'message' | print 'message'; | Add semicolon. | Perl |
if (foo = 29) {{}} | if (foo == 29) {{}} | Use ==. | Kotlin |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
Write-Host 'value' | Write-Host 'value' | Correct. | PowerShell |
id: value
age: hello, | id: value
age: hello | Remove comma. | YAML |
if data = 52 | if data == 52 | Use ==. | MATLAB |
{{'status':62, 'id' 91}} | {{'status':62, 'id':91}} | Colon missing. | Python |
String temp = 'test'; | String temp = "test"; | Double quotes. | Java |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
'67' + 73 | 67 + 73 | Avoid string coercion. | JavaScript |
render | render() | Add parentheses. | Swift |
<ul><li>data<li>world</ul> | <ul><li>data</li><li>world</li></ul> | Close li. | HTML |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
#footer {{ color: blue; }} | #footer {{ color: blue; }} | Correct. | CSS |
try {{ throw 'hello'; }} catch(e) {{}} | try {{ throw new Error('hello'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
assert data > 50 | assert data > 50 | Correct. | Python |
{{'status':'info'}} | {{"status":"info"}} | Use double quotes. | JSON |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
let x: number | null = null; x.toFixed(14); | let x: number | null = null; if(x!==null) x.toFixed(14); | Null check. | TypeScript |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(25); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(25, () => console.log('listening')); | Add callback. | Node.js |
class Person {{ int b; }}
obj.b=5; | class Person {{ public int b; }}
obj.b=5; | Make field public. | Java |
val = result | val = 'result' | Quote strings. | Python |
const count; | const count = 75; | Initialize const. | JavaScript |
{{"id":"world",}} | {{"id":"world"}} | Remove trailing comma. | JSON |
let bar: Int = 'test' | let bar: String = 'test' | Fix type. | Swift |
let val: number = 'value'; | let val: string = 'value'; | Fix type. | TypeScript |
{{"title":"info" "name":16}} | {{"title":"info", "name":16}} | Add comma. | JSON |
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