wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
let index = 88; index += 1; | let mut index = 88; index += 1; | Need mut to modify. | Rust |
const p:Person = {{name:'info'}}; | const p:Person = {{name:'info', age:48}}; | Add missing property. | TypeScript |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
for i=1,35 do print(i) end | for i=1,35 do print(i) end | Correct. | Lua |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
let mut bar=39; let ref1=&mut bar; let r2=&mut bar; | let mut bar=39; {{ let ref1=&mut bar; }} let r2=&mut bar; | Only one mutable borrow. | Rust |
$temp = 96; if ($temp = 96) {{}} | $temp = 96; if ($temp == 96) {{}} | Use ==. | PHP |
DELETE FROM users WHERE age=88 | DELETE FROM users WHERE age=88; | Add semicolon. | SQL |
<hr></hr> | <hr> | Self-closing. | HTML |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
function process() {{ echo 'value'; }} | function process() {{ echo 'value'; }} | Correct. | PHP |
fn baz() -> i32 {{ 77 }} | fn baz() -> i32 {{ 77 }} | Correct. | Rust |
<br></br> | <br> | Self-closing. | HTML |
x := 44 | x := 44 | Correct. | Go |
val count = 28; count = 37 | var count = 28; count = 37 | Use var for reassignment. | Scala |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
val data: Int = 'value' | val data: String = 'value' | Fix type. | Kotlin |
.Item {{ color: blue; }} | .Item {{ color: blue; }} | Correct. | CSS |
SELECT age role FROM users; | SELECT age, role FROM users; | Add comma. | SQL |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
let data: i32 = "info"; | let data: &str = "info"; | Type mismatch. | Rust |
90a = 10 | a90 = 10 | Variable cannot start with digit. | Python |
UPDATE items SET email='test' WHERE status=75 | UPDATE items SET email='test' WHERE status=75; | Add semicolon. | SQL |
{ "name": "hello" } | { "name": "hello" } | Correct. | JSON |
json.sqrt(58) | import json
json.sqrt(58) | Import module first. | Python |
switch(count){{ case 65: break; }} | switch(count){{ case 65: break; default: break; }} | Add default case. | Java |
match temp {{ 1 => {{}} }} | match temp {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
List(70,38,87) | List(70,38,87) | Correct. | Scala |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
var x int | var x int | Correct. | Go |
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(91); | const http = require('http'); http.createServer((req,res) => res.end('value')).listen(91); | Correct. | Node.js |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
handle | handle() | Add parentheses. | Swift |
if item = 99 | if item == 99 | Use ==. | MATLAB |
'86' + 93 | 86 + 93 | Avoid string coercion. | JavaScript |
object Item {{ def main(args: Array[String]) = println("output") }} | object Item {{ def main(args: Array[String]): Unit = println("output") }} | Add return type Unit. | Scala |
for (result in items) | for (result of items) | for...in iterates keys. | JavaScript |
var x = 41; | var x = 41; | Correct. | Dart |
if (foo = 19) {} | if (foo == 19) {} | Use ==. | Dart |
if (y = 11) {{}} | if (y === 11) {{}} | Use === for equality. | JavaScript |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
var val int = 'message' | var val string = 'message' | Type mismatch. | Go |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
data = test | data = 'test' | Quote strings. | Python |
<person age=14> | <person age="14"> | Quote attribute. | XML |
<entry name='data'/> | <entry name="data"/> | Double quotes. | XML |
print 'value' | print 'value'; | Add semicolon. | Perl |
if ($c = 94) {{}} | if ($c -eq 94) {{}} | Use -eq. | PowerShell |
<input type='text' value='hello'> | <input type='text' value='hello' name='age'> | Add name attribute. | HTML |
yield result | yield result | Correct yield. | Python |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
String z = 'hello'; | String z = "hello"; | Double quotes. | Java |
let a: number | null = null; a.toFixed(40); | let a: number | null = null; if(a!==null) a.toFixed(40); | Null check. | TypeScript |
let msg = String::from("message"); let ref=&msg; msg.push_str("!"); | let mut msg = String::from("message"); let ref=&msg; println!("{{}}", ref); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
echo 'result' | echo 'result'; | Add semicolon. | PHP |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
int[] list = new int[72];
list[72] = 5; | int[] list = new int[72];
if (72 < list.length) list[72] = 5; | Check bounds. | Java |
let bar: number = 'message'; | let bar: string = 'message'; | Fix type. | TypeScript |
<ul><li>world<li>hello</ul> | <ul><li>world</li><li>hello</li></ul> | Close li. | HTML |
if z > 51
puts 'data' | if z > 51
puts 'data'
end | Add 'end'. | Ruby |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
SELECT * FROM users WHRE email=20; | SELECT * FROM users WHERE email=20; | Fix WHERE. | SQL |
local z = 22 | local z = 22 | Correct. | Lua |
let x = 'output' | let x = "output" | Double quotes. | Swift |
if (z = 18) | if (z == 18) | Use ==. | R |
let v=vec![56,26,81]; let head=&v[0]; v.push(37); | let mut v=vec![56,26,81]; let head=v[0]; v.push(37); | Copy instead of reference. | Rust |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
if ($c = 16) | if ($c == 16) | Use ==. | Perl |
items[21] | if (length(items) >= 21) items[21] | Check length. | R |
def process():
print('result') | def process():
print('result') | Indent function body. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
["data", 72] | ["data", 72] | Correct. | JSON |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
{ "name": "data" } | { "name": "data" } | Correct. | JSON |
'world' + 36 | 'world' + 36.to_s | Convert int. | Ruby |
{{'title':83, 'value' 35}} | {{'title':83, 'value':35}} | Colon missing. | Python |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
function handle() {{ echo 'hello'; }} | function handle() {{ echo 'hello'; }} | Correct. | PHP |
$arr[78] | if ($arr.Count -gt 78) {{ $arr[78] }} | Check bounds. | PowerShell |
<br></br> | <br> | Self-closing. | HTML |
def handle(count):
return count + 1 | def handle(count):
return count + 1 | Correct. | Python |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
{{'age':'value'}} | {{"age":"value"}} | Use double quotes. | JSON |
const person:Person = {{name:'output'}}; | const person:Person = {{name:'output', age:91}}; | Add missing property. | TypeScript |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
<div><p>output</div></p> | <div><p>output</p></div> | Nest properly. | HTML |
fmt.Println 'data' | fmt.Println('data') | Missing parentheses. | Go |
if data = 71 | if data == 71 | Use ==. | Go |
<img src='world.jpg'> | <img src='world.jpg' alt='desc'> | Add alt text. | HTML |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
for i=1,46 do print(i) end | for i=1,46 do print(i) end | Correct. | Lua |
void main() {{ print('info') }} | void main() {{ print('info'); }} | Add semicolon. | Dart |
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