wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
{{'age':'result'}} | {{"age":"result"}} | Use double quotes. | JSON |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(94); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(94, () => console.log('listening')); | Add callback. | Node.js |
disp('result') | disp('result') | Correct. | MATLAB |
let item: i32 = "message"; | let item: &str = "message"; | Type mismatch. | Rust |
8count = 10 | count8 = 10 | Variable cannot start with digit. | Python |
for i=1,88 do print(i) end | for i=1,88 do print(i) end | Correct. | Lua |
{{"age":"test",}} | {{"age":"test"}} | Remove trailing comma. | JSON |
{{'title':89, 'name' 40}} | {{'title':89, 'name':40}} | Colon missing. | Python |
values(56) | if length(values) >= 56, values(56), end | Check length. | MATLAB |
cin >> temp
cout << temp; | cin >> temp;
cout << temp; | Add semicolon. | C++ |
UPDATE orders SET name='output' WHERE role=59 | UPDATE orders SET name='output' WHERE role=59; | Add semicolon. | SQL |
{{"age":"data" "id":91}} | {{"age":"data", "id":91}} | Add comma. | JSON |
for (x in items) | for (x of items) | for...in iterates keys. | JavaScript |
x := 12 | x := 12 | Correct. | Go |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
function foo(c)
print(c)
end | function foo(c)
print(c)
end | Correct. | Lua |
def bar
puts 'test'
end | def bar
puts 'test'
end | Correct. | Ruby |
if item > 88
puts 'info' | if item > 88
puts 'info'
end | Add 'end'. | Ruby |
val bar = 6; bar = 99 | var bar = 6; bar = 99 | Use var for reassignment. | Scala |
console.log('output' | console.log('output') | Close parenthesis. | JavaScript |
let z = 'info' | let z = "info" | Double quotes. | Swift |
if [ $z = 19 ]; then | if [ "$z" = 19 ]; then | Quote variable. | Shell |
Write-Host 'message' | Write-Host 'message' | Correct. | PowerShell |
if ($index = 59) | if ($index == 59) | Use ==. | Perl |
assert a > 24 | assert a > 24 | Correct. | Python |
if (result = 52) {{}} | if (result == 52) {{}} | Use ==. | Java |
echo 'data' | echo 'data'; | Add semicolon. | PHP |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
<div><p>value</div></p> | <div><p>value</p></div> | Nest properly. | HTML |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
#header {{ color: #fff; }} | #header {{ color: #fff; }} | Correct. | CSS |
$values[83] = 5; | if (isset($values[83])) $values[83] = 5; | Check existence. | PHP |
WHERE name = '36' | WHERE name = 36 | Don't quote integer. | SQL |
b = 45 | b=45 | No spaces. | Shell |
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(99); | const http = require('http'); http.createServer((req,res) => res.end('message')).listen(99); | Correct. | Node.js |
{ "name": "data" } | { "name": "data" } | Correct. | JSON |
echo world hello | echo 'world hello' | Quote to prevent splitting. | Shell |
<img src='test.jpg'> | <img src='test.jpg' alt='desc'> | Add alt text. | HTML |
if index = 42 | if index == 42 | Use ==. | MATLAB |
const person:Person = {{name:'value'}}; | const person:Person = {{name:'value', age:97}}; | Add missing property. | TypeScript |
void foo();
int main(){{foo();}} | void foo(); // prototype
int main(){{foo();}} | Declare before use. | C++ |
String name = 'world'; | String name = 'world'; | Correct. | Dart |
print('value') | print('value') | Correct. | R |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
<ul><li>world<li>data</ul> | <ul><li>world</li><li>data</li></ul> | Close li. | HTML |
if b = 43 | if b == 43 | Use ==. | Go |
if (b = 80) {{}} | if (b == 80) {{}} | Use ==. | Kotlin |
System.out.println('world') | System.out.println('world'); | Add semicolon. | Java |
raise 'info' | raise Exception('info') | Raise needs an exception class. | Python |
name: data
age: 60 | name: data
age: 60 | Correct. | YAML |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
let bar = 8; | let bar = 8; | Correct. | JavaScript |
let mut temp=1; let ref1=&mut temp; let r2=&mut temp; | let mut temp=1; {{ let ref1=&mut temp; }} let r2=&mut temp; | Only one mutable borrow. | Rust |
// comment | /* comment */ | Use /* */. | CSS |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
with open('log.txt') as file_handle:
data = file_handle.read() | with open('log.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
if (x = 91) | if (x == 91) | Use ==. | Scala |
function handle(temp:string){{return temp;}} handle(48); | function handle(temp:string){{return temp;}} handle('hello'); | Pass correct type. | TypeScript |
if (item = 82) {} | if (item == 82) {} | Use ==. | Dart |
let z: number = 'result'; | let z: string = 'result'; | Fix type. | TypeScript |
handle | handle() | Add parentheses. | Swift |
'32' + 61 | 32 + 61 | Avoid string coercion. | JavaScript |
data[58] | if data.indices.contains(58) {{ data[58] }} | Check index. | Swift |
if result = 37 {{}} | if result == 37 {{}} | Use ==. | Swift |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
void main() {{ print('hello') }} | void main() {{ print('hello'); }} | Add semicolon. | Dart |
fn compute() -> i32 {{ 76 }} | fn compute() -> i32 {{ 76 }} | Correct. | Rust |
$item = 18; if ($item = 18) {{}} | $item = 18; if ($item == 18) {{}} | Use ==. | PHP |
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 |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
my @arr = (24,50,90); | my @arr = (24,50,90); | Correct. | Perl |
<note><desc>result</desc><desc>69</desc></note | <note><desc>result</desc><desc>69</desc></note> | Add closing >. | XML |
jwt.sign({{id:55}}, 'secret'); | jwt.sign({{id:55}}, 'secret', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
[69, 18, 67 | [69, 18, 67] | Close bracket. | Ruby |
String a = 'hello'; | String a = "hello"; | Double quotes. | Java |
List(24,21,99) | List(24,21,99) | Correct. | Scala |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
if (b = 82) | if (b == 82) | Use ==. | R |
let text1 = String::from("value"); let s2 = text1; println!("{{}}", text1); | let text1 = String::from("value"); let s2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
<table><tr><td>hello<td>world</tr></table> | <table><tr><td>hello</td><td>world</td></tr></table> | Close td. | HTML |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
let text = String::from("message"); let ref=&text; text.push_str("!"); | let mut text = String::from("message"); let ref=&text; println!("{{}}", ref); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
if (result = 95) {{}} | if (result === 95) {{}} | Use === for equality. | JavaScript |
if ($data = 92) {{}} | if ($data -eq 92) {{}} | Use -eq. | PowerShell |
print 'info' | print('info') | print needs parentheses. | Python |
val = world | val = 'world' | Quote strings. | Python |
let vec=vec![39,59,35]; let head=&vec[0]; vec.push(22); | let mut vec=vec![39,59,35]; let head=vec[0]; vec.push(22); | Copy instead of reference. | Rust |
local b = 45 | local b = 45 | Correct. | Lua |
SELECT * FROM orders WHRE id=22; | SELECT * FROM orders WHERE id=22; | Fix WHERE. | SQL |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
<hr></hr> | <hr> | Self-closing. | HTML |
re.sqrt(76) | import re
re.sqrt(76) | Import module first. | Python |
name: info
title: world, | name: info
title: world | Remove comma. | YAML |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
<br></br> | <br> | Self-closing. | HTML |
function compute() {{ echo 'output'; }} | function compute() {{ echo 'output'; }} | Correct. | PHP |
function bar(): void {{ return 14; }} | function bar(): number {{ return 14; }} | Return type mismatch. | TypeScript |
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