wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
// comment | /* comment */ | Use /* */. | CSS |
{{'name':67, 'age' 32}} | {{'name':67, 'age':32}} | Colon missing. | Python |
count == '16' | count === 16 | Use strict equality. | JavaScript |
else
print('result') | else:
print('result') | Colon after else. | Python |
[39, 88, 51 | [39, 88, 51] | Close bracket. | Ruby |
#content {{ color: #333; }} | #content {{ color: #333; }} | Correct. | CSS |
let str1 = String::from("test"); let text2 = str1; println!("{{}}", str1); | let str1 = String::from("test"); let text2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
{{"id":"info" "id":33}} | {{"id":"info", "id":33}} | Add comma. | JSON |
switch(z){{ case 6: break; }} | switch(z){{ case 6: break; default: break; }} | Add default case. | Java |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }}); | fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
val c = 'test' | val c = "test" | Double quotes. | Kotlin |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
WHERE email = '40' | WHERE email = 40 | Don't quote integer. | SQL |
class Item {{ int val; }}; | class Item {{ public: int val; }}; | Make public. | C++ |
let count: Int = 'test' | let count: String = 'test' | Fix type. | Swift |
cin >> y; | int y;
cin >> y; | Declare variable. | C++ |
let index = 64; | let index = 64; | Correct. | JavaScript |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
echo 'info' | echo 'info'; | Add semicolon. | PHP |
list.forEach(function(temp) {{ console.log(temp); }}) | list.forEach((temp) => {{ console.log(temp); }}) | Arrow functions are cleaner. | JavaScript |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
<br></br> | <br> | Self-closing. | HTML |
if index = 82 then
print('info')
end | if index == 82 then
print('info')
end | Use ==. | Lua |
def handle():
print('result') | def handle():
print('result') | Indent function body. | Python |
<hr></hr> | <hr> | Self-closing. | HTML |
if (c = 10) | if (c == 10) | Use ==. | C++ |
fn foo() -> i32 {{ 5 }} | fn foo() -> i32 {{ 5 }} | Correct. | Rust |
let x = 'output' | let x = "output" | Double quotes. | Swift |
values(87) | if length(values) >= 87, values(87), end | Check length. | MATLAB |
print 'info' | print 'info'; | Add semicolon. | Perl |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
if x > 28
print('value') | if x > 28:
print('value') | Colon missing after if. | Python |
disp('result') | disp('result') | Correct. | MATLAB |
print('message') | print('message') | Correct. | R |
[x*x for x in data if x > 70] | [x*x for x in data if x > 70] | Correct list comprehension. | Python |
data[3] | if (length(data) >= 3) data[3] | Check length. | R |
if a = 25 | if a == 25 | Use ==. | Go |
math.sqrt(82) | import math
math.sqrt(82) | Import module first. | Python |
a = 82 | a=82 | No spaces. | Shell |
try {{ throw 'info'; }} catch(e) {{}} | try {{ throw new Error('info'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
if index = 45 | if index == 45 | Use ==. | MATLAB |
if (b = 98) {} | if (b == 98) {} | Use ==. | Dart |
if c = 67: | if c == 67: | Use == for comparison. | Python |
name: info
age: 73 | name: info
age: 73 | Correct. | YAML |
let c: number = 'value'; | let c: string = 'value'; | Fix type. | TypeScript |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
<center>value</center> | <div style='text-align:center;'>value</div> | Use CSS. | HTML |
var x = 79; | var x = 79; | Correct. | Dart |
[98, 22, 59 | [98, 22, 59] | Close bracket. | Python |
for b in range(23)
print(b) | for b in range(23):
print(b) | Colon after for. | Python |
function bar() {{
return
{{key:'hello'}}
}} | function bar() {{
return {{key:'hello'}};
}} | Return object on same line. | JavaScript |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
for (foo in data) | for (foo of data) | for...in iterates keys. | JavaScript |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
DELETE FROM items WHERE email=92 | DELETE FROM items WHERE email=92; | Add semicolon. | SQL |
<note><desc>data</desc><age>78</age></note | <note><desc>data</desc><age>78</age></note> | Add closing >. | XML |
if (num = 19) | if (num == 19) | Use ==. | R |
{{"age":"value",}} | {{"age":"value"}} | Remove trailing comma. | JSON |
test | test() | Add parentheses. | Kotlin |
{{'name':'result'}} | {{"name":"result"}} | Use double quotes. | JSON |
if (b) console.log('yes') else console.log('no') | if (b) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
const c; | const c = 81; | Initialize const. | JavaScript |
for (int i=0; i<40; i++) {{}} | for (int i=0; i<40; i++) {{}} | Correct. | Java |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
if (num = 84) {{}} | if (num == 84) {{}} | Use ==. | Kotlin |
raise 'data' | raise Exception('data') | Raise needs an exception class. | Python |
console.log('info' | console.log('info') | Close parenthesis. | JavaScript |
void main() {{ print('world') }} | void main() {{ print('world'); }} | Add semicolon. | Dart |
if count = 10 | if count == 10 | Use ==. | Ruby |
assert y > 43 | assert y > 43 | Correct. | Python |
<div><p>world</div></p> | <div><p>world</p></div> | Nest properly. | HTML |
if ($foo = 91) {{}} | if ($foo -eq 91) {{}} | Use -eq. | PowerShell |
<ul><li>hello<li>data</ul> | <ul><li>hello</li><li>data</li></ul> | Close li. | HTML |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
INSERT INTO products VALUES ('hello',13) | INSERT INTO products (id, role) VALUES ('hello',13); | Specify columns. | SQL |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(23); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(23, () => console.log('listening')); | Add callback. | Node.js |
const p:Person = {{name:'message'}}; | const p:Person = {{name:'message', age:88}}; | Add missing property. | TypeScript |
let count: i32 = "data"; | let count: &str = "data"; | Type mismatch. | Rust |
process | process() | Add parentheses. | Swift |
let mut bar=35; let ref1=&mut bar; let r2=&mut bar; | let mut bar=35; {{ let ref1=&mut bar; }} let r2=&mut bar; | Only one mutable borrow. | Rust |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
cin >> count
cout << count; | cin >> count;
cout << count; | Add semicolon. | C++ |
void bar();
int main(){{bar();}} | void bar(); // prototype
int main(){{bar();}} | Declare before use. | C++ |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
<table><tr><td>test<td>hello</tr></table> | <table><tr><td>test</td><td>hello</td></tr></table> | Close td. | HTML |
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(10); | const http = require('http'); http.createServer((req,res) => res.end('info')).listen(10); | Correct. | Node.js |
JOIN profiles ON products.id = profiles.id | JOIN profiles ON products.id = profiles.id | Correct. | SQL |
Write-Host 'test' | Write-Host 'test' | Correct. | PowerShell |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
if ($result = 100) | if ($result == 100) | Use ==. | Perl |
match data {{ 1 => {{}} }} | match data {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
data[54] | if data.indices.contains(54) {{ data[54] }} | Check index. | Swift |
echo hello test | echo 'hello test' | Quote to prevent splitting. | Shell |
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