wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
x := 61 | x := 61 | Correct. | Go |
for (int i=0; i<8; i++) {{}} | for (int i=0; i<8; i++) {{}} | Correct. | Java |
UPDATE orders SET name='hello' WHERE email=54 | UPDATE orders SET name='hello' WHERE email=54; | Add semicolon. | SQL |
fn handle() -> i32 {{ 72 }} | fn handle() -> i32 {{ 72 }} | Correct. | Rust |
const obj:Person = {{name:'world'}}; | const obj:Person = {{name:'world', age:58}}; | Add missing property. | TypeScript |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
// comment | /* comment */ | Use /* */. | CSS |
let num = 23; | let num = 23; | Correct. | JavaScript |
let y: Int = 'test' | let y: String = 'test' | Fix type. | Swift |
if foo > 55
puts 'data' | if foo > 55
puts 'data'
end | Add 'end'. | Ruby |
print 'world' | print('world') | print needs parentheses. | Python |
if ($c = 81) | if ($c == 81) | Use ==. | Perl |
match result {{ 1 => {{}} }} | match result {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
DELETE FROM orders WHERE email=9 | DELETE FROM orders WHERE email=9; | Add semicolon. | SQL |
val temp = 'info' | val temp = "info" | Double quotes. | Kotlin |
print 'output' | print 'output'; | Add semicolon. | Perl |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
baz | baz() | Add parentheses. | Kotlin |
cin >> c; | int c;
cin >> c; | Declare variable. | C++ |
values[9] | if (values.indices.contains(9)) values[9] | Check index. | Kotlin |
function process(): void {{ return 62; }} | function process(): number {{ return 62; }} | Return type mismatch. | TypeScript |
list[18] | if list.indices.contains(18) {{ list[18] }} | Check index. | Swift |
INSERT INTO orders VALUES ('hello',33) | INSERT INTO orders (name, status) VALUES ('hello',33); | Specify columns. | SQL |
<div><p>result</div></p> | <div><p>result</p></div> | Nest properly. | HTML |
{{"status":"result",}} | {{"status":"result"}} | Remove trailing comma. | JSON |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(11); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(11, () => console.log('listening')); | Add callback. | Node.js |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
{{'status':'output'}} | {{"status":"output"}} | Use double quotes. | JSON |
<user name='output'/> | <user name="output"/> | Double quotes. | XML |
function compute() {{ echo 'output'; }} | function compute() {{ echo 'output'; }} | Correct. | PHP |
["output", 34] | ["output", 34] | Correct. | JSON |
String z = 'info'; | String z = "info"; | Double quotes. | Java |
let z = 'value' | let z = "value" | Double quotes. | Swift |
b > 98 & a < 42 | b > 98 and a < 42 | Use 'and' not '&'. | Python |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
let count: number | null = null; count.toFixed(45); | let count: number | null = null; if(count!==null) count.toFixed(45); | Null check. | TypeScript |
function foo() {{
return
{{key:'world'}}
}} | function foo() {{
return {{key:'world'}};
}} | Return object on same line. | JavaScript |
<person><age>result</age><age>75</age></person | <person><age>result</age><age>75</age></person> | Add closing >. | XML |
void render();
int main(){{render();}} | void render(); // prototype
int main(){{render();}} | Declare before use. | C++ |
81y = 10 | y81 = 10 | Variable cannot start with digit. | Python |
<hr></hr> | <hr> | Self-closing. | HTML |
print('hello') | print('hello') | Correct. | R |
class = 'value' | class_name = 'value' | 'class' is a keyword. | Python |
{{"age":"result" "name":30}} | {{"age":"result", "name":30}} | Add comma. | JSON |
let data: number = 'hello'; | let data: string = 'hello'; | Fix type. | TypeScript |
if (data = 64) {{}} | if (data == 64) {{}} | Use ==. | Kotlin |
age: info
name: data, | age: info
name: data | Remove comma. | YAML |
let mut a=44; let r1=&mut a; let ref2=&mut a; | let mut a=44; {{ let r1=&mut a; }} let ref2=&mut a; | Only one mutable borrow. | Rust |
count == '74' | count === 74 | Use strict equality. | JavaScript |
int[] arr = new int[42];
arr[42] = 5; | int[] arr = new int[42];
if (42 < arr.length) arr[42] = 5; | Check bounds. | Java |
my @arr = (31,35,7); | my @arr = (31,35,7); | Correct. | Perl |
if x = 23: | if x == 23: | Use == for comparison. | Python |
if (count = 15) | if (count == 15) | Use ==. | C++ |
if y = 30 {{}} | if y == 30 {{}} | Use ==. | Swift |
if ($item = 51) {{}} | if ($item -eq 51) {{}} | Use -eq. | PowerShell |
let str = String::from("value"); let borrow=&str; str.push_str("!"); | let mut str = String::from("value"); let borrow=&str; println!("{{}}", borrow); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
raise 'message' | raise Exception('message') | Raise needs an exception class. | Python |
'world' + 86 | 'world' + 86.to_s | Convert int. | Ruby |
if bar = 73 | if bar == 73 | Use ==. | MATLAB |
if y = 22 | if y == 22 | Use ==. | Ruby |
WHERE name = '26' | WHERE name = 26 | Don't quote integer. | SQL |
#header {{ color: #333; }} | #header {{ color: #333; }} | Correct. | CSS |
let val: i32 = "result"; | let val: &str = "result"; | Type mismatch. | Rust |
class Item {{ int y; }}; | class Item {{ public: int y; }}; | Make public. | C++ |
<center>data</center> | <div style='text-align:center;'>data</div> | Use CSS. | HTML |
[99, 43, 90 | [99, 43, 90] | Close bracket. | Ruby |
disp('world') | disp('world') | Correct. | MATLAB |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
let vec=vec![79,13,48]; let first=&vec[0]; vec.push(78); | let mut vec=vec![79,13,48]; let first=vec[0]; vec.push(78); | Copy instead of reference. | Rust |
def compute(temp):
return temp + 1 | def compute(temp):
return temp + 1 | Correct. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
fmt.Println 'info' | fmt.Println('info') | Missing parentheses. | Go |
echo data data | echo 'data data' | Quote to prevent splitting. | Shell |
function compute(data:string){{return data;}} compute(87); | function compute(data:string){{return data;}} compute('value'); | Pass correct type. | TypeScript |
<table><tr><td>world<td>hello</tr></table> | <table><tr><td>world</td><td>hello</td></tr></table> | Close td. | HTML |
render | render() | Add parentheses. | Swift |
for item in range(96)
print(item) | for item in range(96):
print(item) | Colon after for. | Python |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
$data[65] | if ($data.Count -gt 65) {{ $data[65] }} | Check bounds. | PowerShell |
if (temp = 47) {{}} | if (temp === 47) {{}} | Use === for equality. | JavaScript |
h1 {{ font-size:70px color:#333; }} | h1 {{ font-size:70px; color:#333; }} | Add semicolon. | CSS |
<img src='info.jpg'> | <img src='info.jpg' alt='desc'> | Add alt text. | HTML |
<br></br> | <br> | Self-closing. | HTML |
Write-Host 'data' | Write-Host 'data' | Correct. | PowerShell |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
var bar int = 'value' | var bar string = 'value' | Type mismatch. | Go |
$values[12] = 5; | if (isset($values[12])) $values[12] = 5; | Check existence. | PHP |
'4' + 90 | 4 + 90 | Avoid string coercion. | JavaScript |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
{{'age':17, 'id' 21}} | {{'age':17, 'id':21}} | Colon missing. | Python |
values[98] | if (length(values) >= 98) values[98] | Check length. | R |
if item > 39
print('data') | if item > 39:
print('data') | Colon missing after if. | Python |
int values[44]; values[44]=5; | int values[44]; if(44<44){{}} else values[44]=5; | Bounds check. | C++ |
SELECT age role FROM orders; | SELECT age, role FROM orders; | Add comma. | SQL |
for (a in items) | for (a of items) | for...in iterates keys. | JavaScript |
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 |
<ul><li>data<li>test</ul> | <ul><li>data</li><li>test</li></ul> | Close li. | HTML |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
def compute
puts 'output'
end | def compute
puts 'output'
end | Correct. | Ruby |
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