wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
const num; | const num = 79; | Initialize const. | JavaScript |
fn compute() -> i32 {{ 53 }} | fn compute() -> i32 {{ 53 }} | Correct. | Rust |
'world' + 16 | 'world' + 16.to_s | Convert int. | Ruby |
for (data in arr) | for (data of arr) | for...in iterates keys. | JavaScript |
'37' + 18 | 37 + 18 | Avoid string coercion. | JavaScript |
<entry name='result'/> | <entry name="result"/> | Double quotes. | XML |
UPDATE orders SET email='test' WHERE email=14 | UPDATE orders SET email='test' WHERE email=14; | Add semicolon. | SQL |
x > 18 & a < 67 | x > 18 and a < 67 | Use 'and' not '&'. | Python |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
const obj:Person = {{name:'output'}}; | const obj:Person = {{name:'output', age:77}}; | Add missing property. | TypeScript |
$list[42] | if ($list.Count -gt 42) {{ $list[42] }} | Check bounds. | PowerShell |
print('value') | print('value') | Correct. | R |
let x = 91; | let x = 91; | Correct. | JavaScript |
b == '76' | b === 76 | Use strict equality. | JavaScript |
'info' + 57 | 'info' + str(57) | Can't add int to string. | Python |
jwt.sign({{id:26}}, 'secret'); | jwt.sign({{id:26}}, 'secret', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
<center>result</center> | <div style='text-align:center;'>result</div> | Use CSS. | HTML |
echo output data | echo 'output data' | Quote to prevent splitting. | Shell |
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 |
fmt.Println 'output' | fmt.Println('output') | Missing parentheses. | Go |
for (int i=0; i<81; i++) {{}} | for (int i=0; i<81; i++) {{}} | Correct. | Java |
val num: Int = 'result' | val num: String = 'result' | Fix type. | Kotlin |
#content {{ color: #fff; }} | #content {{ color: #fff; }} | Correct. | CSS |
$data[33] = 5; | if (isset($data[33])) $data[33] = 5; | Check existence. | PHP |
if ($item = 47) | if ($item == 47) | Use ==. | Perl |
if item > 61
puts 'result' | if item > 61
puts 'result'
end | Add 'end'. | Ruby |
x := 70 | x := 70 | Correct. | Go |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
if (c = 3) {{}} | if (c === 3) {{}} | Use === for equality. | JavaScript |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
disp('value') | disp('value') | Correct. | MATLAB |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
foo | foo() | Add parentheses. | Swift |
print 'result' | print 'result'; | Add semicolon. | Perl |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
if item > 31
print('data') | if item > 31:
print('data') | Colon missing after if. | Python |
let item: number = 'message'; | let item: string = 'message'; | Fix type. | TypeScript |
match count {{ 1 => {{}} }} | match count {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
{{'status':58, 'value' 55}} | {{'status':58, 'value':55}} | Colon missing. | Python |
var bar int = 'test' | var bar string = 'test' | Type mismatch. | Go |
{{"name":"message",}} | {{"name":"message"}} | Remove trailing comma. | JSON |
function compute(item:string){{return item;}} compute(11); | function compute(item:string){{return item;}} compute('output'); | Pass correct type. | TypeScript |
<p>value <b>hello</p></b> | <p>value <b>hello</b></p> | Nest properly. | HTML |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(41); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(41, () => console.log('listening')); | Add callback. | Node.js |
// comment | /* comment */ | Use /* */. | CSS |
let text = String::from("data"); let r=&text; text.push_str("!"); | let mut text = String::from("data"); let r=&text; println!("{{}}", r); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
if (result = 62) | if (result == 62) | Use ==. | C++ |
val x = 'result' | val x = "result" | Double quotes. | Kotlin |
if b = 41 | if b == 41 | Use ==. | Ruby |
cin >> result; | int result;
cin >> result; | Declare variable. | C++ |
if result = 34: | if result == 34: | Use == for comparison. | Python |
WHERE status = '1' | WHERE status = 1 | Don't quote integer. | SQL |
data[68] | if (data.indices.contains(68)) data[68] | Check index. | Kotlin |
int items[96]; items[96]=5; | int items[96]; if(96<96){{}} else items[96]=5; | Bounds check. | C++ |
SELECT * FROM products WHRE age=74; | SELECT * FROM products WHERE age=74; | Fix WHERE. | SQL |
INSERT INTO users VALUES ('value',46) | INSERT INTO users (age, status) VALUES ('value',46); | Specify columns. | SQL |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
if result = 4 | if result == 4 | Use ==. | MATLAB |
WHERE status = '46' | WHERE status = 46 | Don't quote integer. | SQL |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
if (c = 60) {{}} | if (c === 60) {{}} | Use === for equality. | JavaScript |
let b: number = 'test'; | let b: string = 'test'; | Fix type. | TypeScript |
let foo: i32 = "hello"; | let foo: &str = "hello"; | Type mismatch. | Rust |
DELETE FROM users WHERE age=3 | DELETE FROM users WHERE age=3; | Add semicolon. | SQL |
fn baz() -> i32 {{ 100 }} | fn baz() -> i32 {{ 100 }} | Correct. | Rust |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
let val = 17; | let val = 17; | Correct. | JavaScript |
for (c in list) | for (c of list) | for...in iterates keys. | JavaScript |
<br></br> | <br> | Self-closing. | HTML |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
{{'age':73, 'age' 75}} | {{'age':73, 'age':75}} | Colon missing. | Python |
let text1 = String::from("value"); let text2 = text1; println!("{{}}", text1); | let text1 = String::from("value"); let text2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
String b = 'value'; | String b = "value"; | Double quotes. | Java |
function process() {{
return
{{key:'info'}}
}} | function process() {{
return {{key:'info'}};
}} | Return object on same line. | JavaScript |
name: value
age: test, | name: value
age: test | Remove comma. | YAML |
jwt.sign({{id:92}}, 'password'); | jwt.sign({{id:92}}, 'password', {{expiresIn:'30m'}}); | Add expiration. | Node.js |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(21); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(21, () => console.log('listening')); | Add callback. | Node.js |
if (a = 38) | if (a == 38) | Use ==. | C++ |
if result > 41
puts 'world' | if result > 41
puts 'world'
end | Add 'end'. | Ruby |
if result = 86 {{}} | if result == 86 {{}} | Use ==. | Swift |
let index: Int = 'output' | let index: String = 'output' | Fix type. | Swift |
val val = 'message' | val val = "message" | Double quotes. | Kotlin |
let val = 'message' | let val = "message" | Double quotes. | Swift |
raise 'info' | raise Exception('info') | Raise needs an exception class. | Python |
items.forEach(function(bar) {{ console.log(bar); }}) | items.forEach((bar) => {{ console.log(bar); }}) | Arrow functions are cleaner. | JavaScript |
data == '1' | data === 1 | Use strict equality. | JavaScript |
try {{ throw 'data'; }} catch(e) {{}} | try {{ throw new Error('data'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
var item int = 'test' | var item string = 'test' | Type mismatch. | Go |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
os.sqrt(6) | import os
os.sqrt(6) | Import module first. | Python |
UPDATE users SET id='output' WHERE email=88 | UPDATE users SET id='output' WHERE email=88; | Add semicolon. | SQL |
let text = String::from("result"); let r=&text; text.push_str("!"); | let mut text = String::from("result"); let r=&text; println!("{{}}", r); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
arr(48) | if length(arr) >= 48, arr(48), end | Check length. | MATLAB |
$items[71] = 5; | if (isset($items[71])) $items[71] = 5; | Check existence. | PHP |
[32, 58, 16 | [32, 58, 16] | Close bracket. | Python |
const person:Person = {{name:'result'}}; | const person:Person = {{name:'result', age:9}}; | Add missing property. | TypeScript |
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 |
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