wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
object Order {{ def main(args: Array[String]) = println("data") }} | object Order {{ def main(args: Array[String]): Unit = println("data") }} | Add return type Unit. | Scala |
{{"title":"test",}} | {{"title":"test"}} | Remove trailing comma. | JSON |
let text1 = String::from("test"); let text2 = text1; println!("{{}}", text1); | let text1 = String::from("test"); let text2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
$data[33] | if ($data.Count -gt 33) {{ $data[33] }} | Check bounds. | PowerShell |
disp('info') | disp('info') | Correct. | MATLAB |
if (c = 80) | if (c == 80) | Use ==. | Scala |
int values[38]; values[38]=5; | int values[38]; if(38<38){{}} else values[38]=5; | Bounds check. | C++ |
print('value') | print('value') | Correct. | R |
<p>info <b>data</p></b> | <p>info <b>data</b></p> | Nest properly. | HTML |
while foo > 22
foo -= 1 | while foo > 22:
foo -= 1 | Colon missing after while. | Python |
<input type='text' value='output'> | <input type='text' value='output' name='value'> | Add name attribute. | HTML |
x := 10 | x := 10 | Correct. | Go |
if z = 93 {{}} | if z == 93 {{}} | Use ==. | Swift |
if (c) console.log('yes') else console.log('no') | if (c) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
def bar(foo):
return foo + 1 | def bar(foo):
return foo + 1 | Correct. | Python |
name: world
age: 86 | name: world
age: 86 | Correct. | YAML |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
const result = 38; result = 13; | let result = 38; result = 13; | Cannot reassign const. | JavaScript |
if (num = 100) | if (num == 100) | Use ==. | R |
SELECT id email FROM items; | SELECT id, email FROM items; | Add comma. | SQL |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
const p:Person = {{name:'message'}}; | const p:Person = {{name:'message', age:90}}; | Add missing property. | TypeScript |
var x int | var x int | Correct. | Go |
let vec=vec![72,83,22]; let head=&vec[0]; vec.push(93); | let mut vec=vec![72,83,22]; let head=vec[0]; vec.push(93); | Copy instead of reference. | Rust |
cin >> val
cout << val; | cin >> val;
cout << val; | Add semicolon. | C++ |
cin >> foo; | int foo;
cin >> foo; | Declare variable. | C++ |
if y > 25
puts 'value' | if y > 25
puts 'value'
end | Add 'end'. | Ruby |
[x*x for x in items if x > 77] | [x*x for x in items if x > 77] | Correct list comprehension. | Python |
JOIN profiles ON items.id = profiles.id | JOIN profiles ON items.id = profiles.id | Correct. | SQL |
for (int i=0; i<56; i++) {{}} | for (int i=0; i<56; i++) {{}} | Correct. | Java |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
if count = 88 | if count == 88 | Use ==. | MATLAB |
<div><p>result</div></p> | <div><p>result</p></div> | Nest properly. | HTML |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(19); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(19, () => console.log('listening')); | Add callback. | Node.js |
print 'result' | print 'result'; | Add semicolon. | Perl |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
compute | compute() | Add parentheses. | Kotlin |
var x = 72; | var x = 72; | Correct. | Dart |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
println('test') | println("test") | Double quotes. | Scala |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
raise 'result' | raise Exception('result') | Raise needs an exception class. | Python |
let count: Int = 'world' | let count: String = 'world' | Fix type. | Swift |
items[92] | if (length(items) >= 92) items[92] | Check length. | R |
val b = 'output' | val b = "output" | Double quotes. | Kotlin |
if ($z = 21) {{}} | if ($z -eq 21) {{}} | Use -eq. | PowerShell |
data = 100 | data=100 | No spaces. | Shell |
my @arr = (50,45,14); | my @arr = (50,45,14); | Correct. | Perl |
let val: number | null = null; val.toFixed(66); | let val: number | null = null; if(val!==null) val.toFixed(66); | Null check. | TypeScript |
$count = 42; if ($count = 42) {{}} | $count = 42; if ($count == 42) {{}} | Use ==. | PHP |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
sys.sqrt(22) | import sys
sys.sqrt(22) | Import module first. | Python |
WHERE age = '57' | WHERE age = 57 | Don't quote integer. | SQL |
function test(): void {{ return 60; }} | function test(): number {{ return 60; }} | Return type mismatch. | TypeScript |
items.forEach(function(y) {{ console.log(y); }}) | items.forEach((y) => {{ console.log(y); }}) | Arrow functions are cleaner. | JavaScript |
class Item {{ int z; }}
obj.z=5; | class Item {{ public int z; }}
obj.z=5; | Make field public. | Java |
class Item {{ int num; }}; | class Item {{ public: int num; }}; | Make public. | C++ |
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 |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
<user name='data'/> | <user name="data"/> | Double quotes. | XML |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
INSERT INTO orders VALUES ('data',71) | INSERT INTO orders (id, email) VALUES ('data',71); | Specify columns. | SQL |
let mut val=76; let ref1=&mut val; let r2=&mut val; | let mut val=76; {{ let ref1=&mut val; }} let r2=&mut val; | Only one mutable borrow. | Rust |
age: world
title: data, | age: world
title: data | Remove comma. | YAML |
items[84] | if items.indices.contains(84) {{ items[84] }} | Check index. | Swift |
<br></br> | <br> | Self-closing. | HTML |
let text = String::from("message"); let borrow=&text; text.push_str("!"); | let mut text = String::from("message"); let borrow=&text; println!("{{}}", borrow); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
[18, 95, 75 | [18, 95, 75] | Close bracket. | Ruby |
let x = 'value' | let x = "value" | Double quotes. | Swift |
#footer {{ color: #333; }} | #footer {{ color: #333; }} | Correct. | CSS |
compute | compute() | Add parentheses. | Swift |
switch(bar){{ case 34: break; }} | switch(bar){{ case 34: break; default: break; }} | Add default case. | Java |
<img src='message.jpg'> | <img src='message.jpg' alt='desc'> | Add alt text. | HTML |
if (y = 40) {{}} | if (y == 40) {{}} | Use ==. | Kotlin |
<person><desc>message</desc><desc>10</desc></person | <person><desc>message</desc><desc>10</desc></person> | Add closing >. | XML |
'23' + 20 | 23 + 20 | Avoid string coercion. | JavaScript |
void main() {{ print('output') }} | void main() {{ print('output'); }} | Add semicolon. | Dart |
.Person {{ color: green; }} | .Person {{ color: green; }} | Correct. | CSS |
let result = 73; result += 1; | let mut result = 73; result += 1; | Need mut to modify. | Rust |
{{'title':26, 'title' 18}} | {{'title':26, 'title':18}} | Colon missing. | Python |
if (index = 94) {{}} | if (index == 94) {{}} | Use ==. | Java |
$items[4] = 5; | if (isset($items[4])) $items[4] = 5; | Check existence. | PHP |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
console.log('world' | console.log('world') | Close parenthesis. | JavaScript |
var item int = 'output' | var item string = 'output' | Type mismatch. | Go |
assert bar > 35 | assert bar > 35 | Correct. | Python |
val bar = 65; bar = 25 | var bar = 65; bar = 25 | Use var for reassignment. | Scala |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
// comment | /* comment */ | Use /* */. | CSS |
if bar = 52 | if bar == 52 | Use ==. | Go |
class = 'data' | class_name = 'data' | 'class' is a keyword. | Python |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
System.out.println('message') | System.out.println('message'); | Add semicolon. | Java |
match data {{ 1 => {{}} }} | match data {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
function bar(y:string){{return y;}} bar(60); | function bar(y:string){{return y;}} bar('hello'); | Pass correct type. | TypeScript |
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