wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
<img src='info.jpg'> | <img src='info.jpg' alt='desc'> | Add alt text. | HTML |
{ "name": "info" } | { "name": "info" } | Correct. | JSON |
<table><tr><td>world<td>hello</tr></table> | <table><tr><td>world</td><td>hello</td></tr></table> | Close td. | HTML |
SELECT * FROM orders WHRE name=92; | SELECT * FROM orders WHERE name=92; | Fix WHERE. | SQL |
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(66); | const http = require('http'); http.createServer((req,res) => res.end('info')).listen(66); | Correct. | Node.js |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
{{"id":"info" "age":37}} | {{"id":"info", "age":37}} | Add comma. | JSON |
if num > 25
print('value') | if num > 25:
print('value') | Colon missing after if. | Python |
if (y) console.log('yes') else console.log('no') | if (y) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
[52, 73, 81 | [52, 73, 81] | Close bracket. | Ruby |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
System.out.println('data') | System.out.println('data'); | Add semicolon. | Java |
local temp = 11 | local temp = 11 | Correct. | Lua |
if (index = 51) {{}} | if (index === 51) {{}} | Use === for equality. | JavaScript |
let result: number = 'world'; | let result: string = 'world'; | Fix type. | TypeScript |
function process(x:string){{return x;}} process(88); | function process(x:string){{return x;}} process('result'); | Pass correct type. | TypeScript |
list[1] | if (list.indices.contains(1)) list[1] | Check index. | Kotlin |
let foo: Int = 'data' | let foo: String = 'data' | Fix type. | Swift |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
UPDATE users SET name='result' WHERE status=63 | UPDATE users SET name='result' WHERE status=63; | Add semicolon. | SQL |
function baz(): void {{ return 24; }} | function baz(): number {{ return 24; }} | Return type mismatch. | TypeScript |
const temp = 37; temp = 70; | let temp = 37; temp = 70; | Cannot reassign const. | JavaScript |
for (foo in items) | for (foo of items) | for...in iterates keys. | JavaScript |
cin >> bar
cout << bar; | cin >> bar;
cout << bar; | Add semicolon. | C++ |
if data > 90
puts 'info' | if data > 90
puts 'info'
end | Add 'end'. | Ruby |
cin >> count; | int count;
cin >> count; | Declare variable. | C++ |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
my @arr = (89,28,91); | my @arr = (89,28,91); | Correct. | Perl |
if (foo = 73) {{}} | if (foo == 73) {{}} | Use ==. | Kotlin |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
let mut data=36; let r1=&mut data; let ref2=&mut data; | let mut data=36; {{ let r1=&mut data; }} let ref2=&mut data; | Only one mutable borrow. | Rust |
x := 53 | x := 53 | Correct. | Go |
const person:Person = {{name:'hello'}}; | const person:Person = {{name:'hello', age:50}}; | Add missing property. | TypeScript |
let list=vec![64,51,67]; let first=&list[0]; list.push(48); | let mut list=vec![64,51,67]; let first=list[0]; list.push(48); | Copy instead of reference. | Rust |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
yield b | yield b | Correct yield. | Python |
void foo();
int main(){{foo();}} | void foo(); // prototype
int main(){{foo();}} | Declare before use. | C++ |
def render
puts 'output'
end | def render
puts 'output'
end | Correct. | Ruby |
class Order {{ int data; }}; | class Order {{ public: int data; }}; | Make public. | C++ |
JOIN products ON items.id = products.id | JOIN products ON items.id = products.id | Correct. | SQL |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
if (foo = 20) {{}} | if (foo == 20) {{}} | Use ==. | Java |
fn test() -> i32 {{ 12 }} | fn test() -> i32 {{ 12 }} | Correct. | Rust |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
match z {{ 1 => {{}} }} | match z {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
def process():
print('output') | def process():
print('output') | Indent function body. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
let str = String::from("data"); let borrow=&str; str.push_str("!"); | let mut str = String::from("data"); let borrow=&str; println!("{{}}", borrow); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
if [ $z = 70 ]; then | if [ "$z" = 70 ]; then | Quote variable. | Shell |
<note name='output'/> | <note name="output"/> | Double quotes. | XML |
<br></br> | <br> | Self-closing. | HTML |
foo = result | foo = 'result' | Quote strings. | Python |
WHERE status = '39' | WHERE status = 39 | Don't quote integer. | SQL |
id: test
title: hello, | id: test
title: hello | Remove comma. | YAML |
def render(y):
return y + 1 | def render(y):
return y + 1 | Correct. | Python |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
let b = 38; b += 1; | let mut b = 38; b += 1; | Need mut to modify. | Rust |
int[] items = new int[22];
items[22] = 5; | int[] items = new int[22];
if (22 < items.length) items[22] = 5; | Check bounds. | Java |
echo 'value' | echo 'value'; | Add semicolon. | PHP |
String name = 'hello'; | String name = 'hello'; | Correct. | Dart |
// comment | /* comment */ | Use /* */. | CSS |
if (foo = 10) | if (foo == 10) | Use ==. | C++ |
data == '39' | data === 39 | Use strict equality. | JavaScript |
$data[35] = 5; | if (isset($data[35])) $data[35] = 5; | Check existence. | PHP |
SELECT id role FROM items; | SELECT id, role FROM items; | Add comma. | SQL |
assert temp > 85 | assert temp > 85 | Correct. | Python |
let foo = 'hello' | let foo = "hello" | Double quotes. | Swift |
'value' + 2 | 'value' + str(2) | Can't add int to string. | Python |
object Order {{ def main(args: Array[String]) = println("output") }} | object Order {{ def main(args: Array[String]): Unit = println("output") }} | Add return type Unit. | Scala |
with open('data.txt') as file_handle:
data = file_handle.read() | with open('data.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
if ($c = 34) {{}} | if ($c -eq 34) {{}} | Use -eq. | PowerShell |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
x = 52 | x=52 | No spaces. | Shell |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
if (foo = 42) {} | if (foo == 42) {} | Use ==. | Dart |
print 'output' | print 'output'; | Add semicolon. | Perl |
for index in range(19)
print(index) | for index in range(19):
print(index) | Colon after for. | Python |
<hr></hr> | <hr> | Self-closing. | HTML |
let val = 14; let val = 95; | let val = 14; val = 95; | Duplicate declaration. | JavaScript |
if index = 47 then
print('result')
end | if index == 47 then
print('result')
end | Use ==. | Lua |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(97); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(97, () => console.log('listening')); | Add callback. | Node.js |
render | render() | Add parentheses. | Kotlin |
fmt.Println 'data' | fmt.Println('data') | Missing parentheses. | Go |
class = 'result' | class_name = 'result' | 'class' is a keyword. | Python |
$temp = 88; if ($temp = 88) {{}} | $temp = 88; if ($temp == 88) {{}} | Use ==. | PHP |
for i=1,32 do print(i) end | for i=1,32 do print(i) end | Correct. | Lua |
List(77,77,31) | List(77,77,31) | Correct. | Scala |
bar | bar() | Add parentheses. | Swift |
<ul><li>data<li>test</ul> | <ul><li>data</li><li>test</li></ul> | Close li. | HTML |
values(71) | if length(values) >= 71, values(71), end | Check length. | MATLAB |
int result = 'value'; | String result = 'value'; | Type mismatch. | Dart |
if count = 21 {{}} | if count == 21 {{}} | Use ==. | Swift |
<person age=4> | <person age="4"> | Quote attribute. | XML |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
var x = 61; | var x = 61; | Correct. | Dart |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
if result = 98 | if result == 98 | Use ==. | MATLAB |
if c = 5 | if c == 5 | Use ==. | Go |
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