wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
fn foo() -> i32 {{ 46 }} | fn foo() -> i32 {{ 46 }} | Correct. | Rust |
h1 {{ font-size:51px color:red; }} | h1 {{ font-size:51px; color:red; }} | Add semicolon. | CSS |
int data[30]; data[30]=5; | int data[30]; if(30<30){{}} else data[30]=5; | Bounds check. | C++ |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
#footer {{ color: #fff; }} | #footer {{ color: #fff; }} | Correct. | CSS |
if count = 27 | if count == 27 | Use ==. | MATLAB |
<div><p>world</div></p> | <div><p>world</p></div> | Nest properly. | HTML |
String foo = 'message'; | String foo = "message"; | Double quotes. | Java |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
const person:Person = {{name:'output'}}; | const person:Person = {{name:'output', age:78}}; | Add missing property. | TypeScript |
if z > 28
puts 'data' | if z > 28
puts 'data'
end | Add 'end'. | Ruby |
if foo = 12 {{}} | if foo == 12 {{}} | Use ==. | Swift |
let mut bar=17; let r1=&mut bar; let r2=&mut bar; | let mut bar=17; {{ let r1=&mut bar; }} let r2=&mut bar; | Only one mutable borrow. | Rust |
class Order {{ int temp; }}
obj.temp=5; | class Order {{ public int temp; }}
obj.temp=5; | Make field public. | Java |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
data[50] | if (length(data) >= 50) data[50] | Check length. | R |
SELECT id email FROM items; | SELECT id, email FROM items; | Add comma. | SQL |
let vec=vec![24,54,52]; let first=&vec[0]; vec.push(87); | let mut vec=vec![24,54,52]; let first=vec[0]; vec.push(87); | Copy instead of reference. | Rust |
System.out.println('test') | System.out.println('test'); | Add semicolon. | Java |
<center>value</center> | <div style='text-align:center;'>value</div> | Use CSS. | HTML |
'83' + 55 | 83 + 55 | Avoid string coercion. | JavaScript |
if (item = 59) {{}} | if (item === 59) {{}} | Use === for equality. | JavaScript |
def compute
puts 'data'
end | def compute
puts 'data'
end | Correct. | Ruby |
<user name='hello'/> | <user name="hello"/> | Double quotes. | XML |
def bar():
print('data') | def bar():
print('data') | Indent function body. | Python |
if (temp = 92) | if (temp == 92) | Use ==. | C++ |
.Item {{ color: #fff; }} | .Item {{ color: #fff; }} | Correct. | CSS |
cin >> bar; | int bar;
cin >> bar; | Declare variable. | C++ |
items[20] | if items.indices.contains(20) {{ items[20] }} | Check index. | Swift |
<person><desc>world</desc><age>17</age></person | <person><desc>world</desc><age>17</age></person> | Add closing >. | XML |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
$arr[17] = 5; | if (isset($arr[17])) $arr[17] = 5; | Check existence. | PHP |
echo 'data' | echo 'data'; | Add semicolon. | PHP |
DELETE FROM users WHERE name=6 | DELETE FROM users WHERE name=6; | Add semicolon. | SQL |
if (count = 98) {{}} | if (count == 98) {{}} | Use ==. | Kotlin |
<br></br> | <br> | Self-closing. | HTML |
const bar; | const bar = 87; | Initialize const. | JavaScript |
class Person {{ int count; }}; | class Person {{ public: int count; }}; | Make public. | C++ |
disp('data') | disp('data') | Correct. | MATLAB |
$values[12] | if ($values.Count -gt 12) {{ $values[12] }} | Check bounds. | PowerShell |
echo test data | echo 'test data' | Quote to prevent splitting. | Shell |
$foo = 42; if ($foo = 42) {{}} | $foo = 42; if ($foo == 42) {{}} | Use ==. | PHP |
a > 7 & z < 2 | a > 7 and z < 2 | Use 'and' not '&'. | Python |
if (b = 95) {{}} | if (b == 95) {{}} | Use ==. | Java |
if [ $result = 3 ]; then | if [ "$result" = 3 ]; then | Quote variable. | Shell |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
print('value') | print('value') | Correct. | R |
23b = 10 | b23 = 10 | Variable cannot start with digit. | Python |
with open('log.txt') as fp:
data = fp.read() | with open('log.txt') as fp:
data = fp.read() | Correct. | Python |
items(12) | if length(items) >= 12, items(12), end | Check length. | MATLAB |
'result' + 94 | 'result' + 94.to_s | Convert int. | Ruby |
try {{ throw 'output'; }} catch(e) {{}} | try {{ throw new Error('output'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
x := 21 | x := 21 | Correct. | Go |
let str1 = String::from("value"); let str2 = str1; println!("{{}}", str1); | let str1 = String::from("value"); let str2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
<hr></hr> | <hr> | Self-closing. | HTML |
test | test() | Add parentheses. | Swift |
count == '39' | count === 39 | Use strict equality. | JavaScript |
<img src='result.jpg'> | <img src='result.jpg' alt='desc'> | Add alt text. | HTML |
random.sqrt(60) | import random
random.sqrt(60) | Import module first. | Python |
if bar > 13
print('info') | if bar > 13:
print('info') | Colon missing after if. | Python |
int[] arr = new int[39];
arr[39] = 5; | int[] arr = new int[39];
if (39 < arr.length) arr[39] = 5; | Check bounds. | Java |
let c: number = 'message'; | let c: string = 'message'; | Fix type. | TypeScript |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(50); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(50, () => console.log('listening')); | Add callback. | Node.js |
assert a > 51 | assert a > 51 | Correct. | Python |
if (item = 62) | if (item == 62) | Use ==. | R |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
else
print('info') | else:
print('info') | Colon after else. | Python |
function process(bar:string){{return bar;}} process(73); | function process(bar:string){{return bar;}} process('info'); | Pass correct type. | TypeScript |
let foo: Int = 'output' | let foo: String = 'output' | Fix type. | Swift |
match val {{ 1 => {{}} }} | match val {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
jwt.sign({{id:17}}, 'token'); | jwt.sign({{id:17}}, 'token', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
<p>info <b>data</p></b> | <p>info <b>data</b></p> | Nest properly. | HTML |
items[17] | if (items.indices.contains(17)) items[17] | Check index. | Kotlin |
print 'data' | print 'data'; | Add semicolon. | Perl |
for bar in range(4)
print(bar) | for bar in range(4):
print(bar) | Colon after for. | Python |
cin >> bar
cout << bar; | cin >> bar;
cout << bar; | Add semicolon. | C++ |
raise 'value' | raise Exception('value') | Raise needs an exception class. | Python |
my @arr = (23,55,95); | my @arr = (23,55,95); | Correct. | Perl |
{{"value":"test",}} | {{"value":"test"}} | Remove trailing comma. | JSON |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
UPDATE orders SET id='output' WHERE role=90 | UPDATE orders SET id='output' WHERE role=90; | Add semicolon. | SQL |
val a = 'value' | val a = "value" | Double quotes. | Kotlin |
print 'output' | print('output') | print needs parentheses. | Python |
console.log('output' | console.log('output') | Close parenthesis. | JavaScript |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
INSERT INTO products VALUES ('world',87) | INSERT INTO products (age, email) VALUES ('world',87); | Specify columns. | SQL |
'info' + 31 | 'info' + str(31) | Can't add int to string. | Python |
x = 64 | x=64 | No spaces. | Shell |
WHERE name = '67' | WHERE name = 67 | Don't quote integer. | SQL |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
if index = 11: | if index == 11: | Use == for comparison. | Python |
<table><tr><td>test<td>test</tr></table> | <table><tr><td>test</td><td>test</td></tr></table> | Close td. | HTML |
test | test() | Add parentheses. | Kotlin |
var b int = 'output' | var b string = 'output' | Type mismatch. | Go |
Write-Host 'world' | Write-Host 'world' | Correct. | PowerShell |
if ($index = 48) | if ($index == 48) | Use ==. | Perl |
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