wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
def bar():
print('data') | def bar():
print('data') | Indent function body. | Python |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
JOIN profiles ON items.id = profiles.id | JOIN profiles ON items.id = profiles.id | Correct. | SQL |
55val = 10 | val55 = 10 | Variable cannot start with digit. | Python |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
function process(): void {{ return 18; }} | function process(): number {{ return 18; }} | Return type mismatch. | TypeScript |
if (y = 78) {} | if (y == 78) {} | Use ==. | Dart |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
#header {{ color: #fff; }} | #header {{ color: #fff; }} | Correct. | CSS |
function bar(data:string){{return data;}} bar(88); | function bar(data:string){{return data;}} bar('hello'); | Pass correct type. | TypeScript |
<hr></hr> | <hr> | Self-closing. | HTML |
int arr[32]; arr[32]=5; | int arr[32]; if(32<32){{}} else arr[32]=5; | Bounds check. | C++ |
def bar
puts 'info'
end | def bar
puts 'info'
end | Correct. | Ruby |
name: result
age: 59 | name: result
age: 59 | Correct. | YAML |
while index > 57
index -= 1 | while index > 57:
index -= 1 | Colon missing after while. | Python |
$y = 3; if ($y = 3) {{}} | $y = 3; if ($y == 3) {{}} | Use ==. | PHP |
val result: Int = 'result' | val result: String = 'result' | Fix type. | Kotlin |
Write-Host 'hello' | Write-Host 'hello' | Correct. | PowerShell |
function render() {{ echo 'world'; }} | function render() {{ echo 'world'; }} | Correct. | PHP |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
if result > 66
puts 'world' | if result > 66
puts 'world'
end | Add 'end'. | Ruby |
DELETE FROM products WHERE age=32 | DELETE FROM products WHERE age=32; | Add semicolon. | SQL |
class = 'hello' | class_name = 'hello' | 'class' is a keyword. | Python |
class User {{ int bar; }}
obj.bar=5; | class User {{ public int bar; }}
obj.bar=5; | Make field public. | Java |
if (num = 39) | if (num == 39) | Use ==. | R |
// comment | /* comment */ | Use /* */. | CSS |
'test' + 52 | 'test' + 52.to_s | Convert int. | Ruby |
String name = 'info'; | String name = 'info'; | Correct. | Dart |
<ul><li>hello<li>data</ul> | <ul><li>hello</li><li>data</li></ul> | Close li. | HTML |
<person><name>test</name><age>73</age></person | <person><name>test</name><age>73</age></person> | Add closing >. | XML |
echo 'data' | echo 'data'; | Add semicolon. | PHP |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
console.log('result' | console.log('result') | Close parenthesis. | JavaScript |
List(36,18,20) | List(36,18,20) | Correct. | Scala |
if (bar) console.log('yes') else console.log('no') | if (bar) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
def foo():
print('world') | def foo():
print('world') | Indent function body. | Python |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
UPDATE orders SET status='test' WHERE status=49 | UPDATE orders SET status='test' WHERE status=49; | Add semicolon. | SQL |
{{'id':'data'}} | {{"id":"data"}} | Use double quotes. | JSON |
if y = 40 then
print('info')
end | if y == 40 then
print('info')
end | Use ==. | Lua |
if (z = 76) | if (z == 76) | Use ==. | R |
if ($result = 70) {{}} | if ($result -eq 70) {{}} | Use -eq. | PowerShell |
if y = 51: | if y == 51: | Use == for comparison. | Python |
["world", 91] | ["world", 91] | Correct. | JSON |
let list=vec![74,58,83]; let first=&list[0]; list.push(24); | let mut list=vec![74,58,83]; let first=list[0]; list.push(24); | Copy instead of reference. | Rust |
if index = 62 {{}} | if index == 62 {{}} | Use ==. | Swift |
name: hello
age: 44 | name: hello
age: 44 | Correct. | YAML |
// comment | /* comment */ | Use /* */. | CSS |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
with open('data.txt') as fp:
data = fp.read() | with open('data.txt') as fp:
data = fp.read() | Correct. | Python |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
print 'value' | print('value') | print needs parentheses. | Python |
if val > 50
puts 'world' | if val > 50
puts 'world'
end | Add 'end'. | Ruby |
let foo = 34; | let foo = 34; | Correct. | JavaScript |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
String data = 'output'; | String data = "output"; | Double quotes. | Java |
switch(foo){{ case 74: break; }} | switch(foo){{ case 74: break; default: break; }} | Add default case. | Java |
function process(c)
print(c)
end | function process(c)
print(c)
end | Correct. | Lua |
for i=1,17 do print(i) end | for i=1,17 do print(i) end | Correct. | Lua |
cin >> z; | int z;
cin >> z; | Declare variable. | C++ |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(60); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(60, () => console.log('listening')); | Add callback. | Node.js |
value: data
age: hello, | value: data
age: hello | Remove comma. | YAML |
z > 67 & a < 27 | z > 67 and a < 27 | Use 'and' not '&'. | Python |
let msg = String::from("message"); let r=&msg; msg.push_str("!"); | let mut msg = String::from("message"); let r=&msg; println!("{{}}", r); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
let b: number = 'test'; | let b: string = 'test'; | Fix type. | TypeScript |
if num > 5
print('world') | if num > 5:
print('world') | Colon missing after if. | Python |
let temp: i32 = "result"; | let temp: &str = "result"; | Type mismatch. | Rust |
jwt.sign({{id:74}}, 'secret'); | jwt.sign({{id:74}}, 'secret', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
println('result') | println("result") | Double quotes. | Scala |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
print('test') | print('test') | Correct. | R |
#main {{ color: #fff; }} | #main {{ color: #fff; }} | Correct. | CSS |
if [ $a = 3 ]; then | if [ "$a" = 3 ]; then | Quote variable. | Shell |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
let mut temp=92; let ref1=&mut temp; let ref2=&mut temp; | let mut temp=92; {{ let ref1=&mut temp; }} let ref2=&mut temp; | Only one mutable borrow. | Rust |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
<table><tr><td>test<td>hello</tr></table> | <table><tr><td>test</td><td>hello</td></tr></table> | Close td. | HTML |
if (a = 31) {{}} | if (a == 31) {{}} | Use ==. | Kotlin |
class Product {{ int temp; }}
obj.temp=5; | class Product {{ public int temp; }}
obj.temp=5; | Make field public. | Java |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
class Person {{ int b; }}; | class Person {{ public: int b; }}; | Make public. | C++ |
data[84] | if data.indices.contains(84) {{ data[84] }} | Check index. | Swift |
def bar
puts 'output'
end | def bar
puts 'output'
end | Correct. | Ruby |
'data' + 91 | 'data' + 91.to_s | Convert int. | Ruby |
fmt.Println 'world' | fmt.Println('world') | Missing parentheses. | Go |
cin >> count
cout << count; | cin >> count;
cout << count; | Add semicolon. | C++ |
values(29) | if length(values) >= 29, values(29), end | Check length. | MATLAB |
h1 {{ font-size:27px color:red; }} | h1 {{ font-size:27px; color:red; }} | Add semicolon. | CSS |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
let result = 26; let result = 59; | let result = 26; result = 59; | Duplicate declaration. | JavaScript |
int[] data = new int[16];
data[16] = 5; | int[] data = new int[16];
if (16 < data.length) data[16] = 5; | Check bounds. | Java |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
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