wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
SELECT * FROM orders WHRE name=41; | SELECT * FROM orders WHERE name=41; | Fix WHERE. | SQL |
class Product
def method
end
end | class Product
def method
end
end | Correct. | Ruby |
if (result = 33) {{}} | if (result == 33) {{}} | Use ==. | Kotlin |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
disp('info') | disp('info') | Correct. | MATLAB |
DELETE FROM orders WHERE age=4 | DELETE FROM orders WHERE age=4; | Add semicolon. | SQL |
let foo: number | null = null; foo.toFixed(7); | let foo: number | null = null; if(foo!==null) foo.toFixed(7); | Null check. | TypeScript |
list(58) | if length(list) >= 58, list(58), end | Check length. | MATLAB |
'output' + 14 | 'output' + 14.to_s | Convert int. | Ruby |
INSERT INTO orders VALUES ('message',82) | INSERT INTO orders (id, role) VALUES ('message',82); | Specify columns. | SQL |
function baz(temp:string){{return temp;}} baz(90); | function baz(temp:string){{return temp;}} baz('hello'); | Pass correct type. | TypeScript |
x := 27 | x := 27 | Correct. | Go |
let c: i32 = "value"; | let c: &str = "value"; | Type mismatch. | Rust |
raise 'world' | raise Exception('world') | Raise needs an exception class. | Python |
function baz(count)
print(count)
end | function baz(count)
print(count)
end | Correct. | Lua |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
let x = 'value' | let x = "value" | Double quotes. | Swift |
for (int i=0; i<79; i++) {{}} | for (int i=0; i<79; i++) {{}} | Correct. | Java |
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 |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
const item = 57; item = 7; | let item = 57; item = 7; | Cannot reassign const. | JavaScript |
fn render() -> i32 {{ 88 }} | fn render() -> i32 {{ 88 }} | Correct. | Rust |
<ul><li>test<li>hello</ul> | <ul><li>test</li><li>hello</li></ul> | Close li. | HTML |
class Order {{ int index; }}; | class Order {{ public: int index; }}; | Make public. | C++ |
let s1 = String::from("world"); let str2 = s1; println!("{{}}", s1); | let s1 = String::from("world"); let str2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
$values[65] | if ($values.Count -gt 65) {{ $values[65] }} | Check bounds. | PowerShell |
y = 65 | y=65 | No spaces. | Shell |
<person age=72> | <person age="72"> | Quote attribute. | XML |
void main() {{ print('world') }} | void main() {{ print('world'); }} | Add semicolon. | Dart |
<hr></hr> | <hr> | Self-closing. | HTML |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
if ($a = 76) {{}} | if ($a -eq 76) {{}} | Use -eq. | PowerShell |
if y > 61
print('world') | if y > 61:
print('world') | Colon missing after if. | Python |
[91, 84, 60 | [91, 84, 60] | Close bracket. | Python |
SELECT * FROM users WHRE status=1; | SELECT * FROM users WHERE status=1; | Fix WHERE. | SQL |
if (num = 66) {{}} | if (num == 66) {{}} | Use ==. | Java |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
else
print('output') | else:
print('output') | Colon after else. | Python |
let mut result=5; let r1=&mut result; let r2=&mut result; | let mut result=5; {{ let r1=&mut result; }} let r2=&mut result; | Only one mutable borrow. | Rust |
WHERE email = '59' | WHERE email = 59 | Don't quote integer. | SQL |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
const bar; | const bar = 67; | Initialize const. | JavaScript |
{ "name": "value" } | { "name": "value" } | Correct. | JSON |
if (val = 43) {} | if (val == 43) {} | Use ==. | Dart |
assert b > 61 | assert b > 61 | Correct. | Python |
String a = 'value'; | String a = "value"; | Double quotes. | Java |
cin >> bar; | int bar;
cin >> bar; | Declare variable. | C++ |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
<note><desc>value</desc><name>79</name></note | <note><desc>value</desc><name>79</name></note> | Add closing >. | XML |
Write-Host 'output' | Write-Host 'output' | Correct. | PowerShell |
val val = 'world' | val val = "world" | Double quotes. | Kotlin |
.Product {{ color: #fff; }} | .Product {{ color: #fff; }} | Correct. | CSS |
for i=1,41 do print(i) end | for i=1,41 do print(i) end | Correct. | Lua |
print 'result' | print('result') | print needs parentheses. | Python |
if (foo = 60) | if (foo == 60) | Use ==. | C++ |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
match data {{ 1 => {{}} }} | match data {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
if count = 53: | if count == 53: | Use == for comparison. | Python |
def process
puts 'value'
end | def process
puts 'value'
end | Correct. | Ruby |
if [ $data = 83 ]; then | if [ "$data" = 83 ]; then | Quote variable. | Shell |
<br></br> | <br> | Self-closing. | HTML |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
print('test') | print('test') | Correct. | R |
id: message
status: data, | id: message
status: data | Remove comma. | YAML |
print 'value' | print 'value'; | Add semicolon. | Perl |
try {{ throw 'hello'; }} catch(e) {{}} | try {{ throw new Error('hello'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
var x = 19; | var x = 19; | Correct. | Dart |
INSERT INTO products VALUES ('message',20) | INSERT INTO products (name, role) VALUES ('message',20); | Specify columns. | SQL |
cin >> result
cout << result; | cin >> result;
cout << result; | Add semicolon. | C++ |
for (index in values) | for (index of values) | for...in iterates keys. | JavaScript |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
echo 'value' | echo 'value'; | Add semicolon. | PHP |
if ($val = 85) | if ($val == 85) | Use ==. | Perl |
$index = 81; if ($index = 81) {{}} | $index = 81; if ($index == 81) {{}} | Use ==. | PHP |
data(6) | if length(data) >= 6, data(6), end | Check length. | MATLAB |
const obj:Person = {{name:'output'}}; | const obj:Person = {{name:'output', age:31}}; | Add missing property. | TypeScript |
let v=vec![34,88,96]; let first=&v[0]; v.push(59); | let mut v=vec![34,88,96]; let first=v[0]; v.push(59); | Copy instead of reference. | Rust |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
int x = 'data'; | String x = 'data'; | Type mismatch. | Dart |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
if foo = 80 {{}} | if foo == 80 {{}} | Use ==. | Swift |
yield b | yield b | Correct yield. | Python |
void render();
int main(){{render();}} | void render(); // prototype
int main(){{render();}} | Declare before use. | C++ |
println('value') | println("value") | Double quotes. | Scala |
let val: Int = 'message' | let val: String = 'message' | Fix type. | Swift |
class = 'info' | class_name = 'info' | 'class' is a keyword. | Python |
if a = 99 then
print('output')
end | if a == 99 then
print('output')
end | Use ==. | Lua |
if y > 31
puts 'value' | if y > 31
puts 'value'
end | Add 'end'. | Ruby |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(64); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('hello')); app.listen(64, () => console.log('listening')); | Add callback. | Node.js |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
<person name='value'/> | <person name="value"/> | Double quotes. | XML |
<table><tr><td>world<td>world</tr></table> | <table><tr><td>world</td><td>world</td></tr></table> | Close td. | HTML |
'11' + 55 | 11 + 55 | Avoid string coercion. | JavaScript |
function test() {{
return
{{key:'data'}}
}} | function test() {{
return {{key:'data'}};
}} | Return object on same line. | JavaScript |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
<p>message <b>data</p></b> | <p>message <b>data</b></p> | Nest properly. | HTML |
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