wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
#main {{ color: #fff; }} | #main {{ color: #fff; }} | Correct. | CSS |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
let msg = String::from("info"); let r=&msg; msg.push_str("!"); | let mut msg = String::from("info"); let r=&msg; println!("{{}}", r); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
for (a in values) | for (a of values) | for...in iterates keys. | JavaScript |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
cin >> num; | int num;
cin >> num; | Declare variable. | C++ |
function process(temp)
print(temp)
end | function process(temp)
print(temp)
end | Correct. | Lua |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(26); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(26, () => console.log('listening')); | Add callback. | Node.js |
if foo = 28 then
print('test')
end | if foo == 28 then
print('test')
end | Use ==. | Lua |
re.sqrt(74) | import re
re.sqrt(74) | Import module first. | Python |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
<person age=21> | <person age="21"> | Quote attribute. | XML |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
var x int | var x int | Correct. | Go |
var x = 57; | var x = 57; | Correct. | Dart |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
class User {{ int num; }}
obj.num=5; | class User {{ public int num; }}
obj.num=5; | Make field public. | Java |
<img src='world.jpg'> | <img src='world.jpg' alt='desc'> | Add alt text. | HTML |
switch(val){{ case 52: break; }} | switch(val){{ case 52: break; default: break; }} | Add default case. | Java |
{{'title':92, 'age' 26}} | {{'title':92, 'age':26}} | Colon missing. | Python |
print 'result' | print('result') | print needs parentheses. | Python |
[88, 31, 60 | [88, 31, 60] | Close bracket. | Python |
if (c = 35) {} | if (c == 35) {} | Use ==. | Dart |
let x: i32 = "output"; | let x: &str = "output"; | Type mismatch. | Rust |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
let vec=vec![47,13,10]; let primary=&vec[0]; vec.push(39); | let mut vec=vec![47,13,10]; let primary=vec[0]; vec.push(39); | Copy instead of reference. | Rust |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
<p>info <b>hello</p></b> | <p>info <b>hello</b></p> | Nest properly. | HTML |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
{ "name": "data" } | { "name": "data" } | Correct. | JSON |
with open('data.txt') as file_handle:
data = file_handle.read() | with open('data.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
let c: Int = 'output' | let c: String = 'output' | Fix type. | Swift |
UPDATE orders SET name='info' WHERE role=31 | UPDATE orders SET name='info' WHERE role=31; | Add semicolon. | SQL |
else
print('value') | else:
print('value') | Colon after else. | Python |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
match val {{ 1 => {{}} }} | match val {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
if bar > 10
print('world') | if bar > 10:
print('world') | Colon missing after if. | Python |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
let str1 = String::from("world"); let s2 = str1; println!("{{}}", str1); | let str1 = String::from("world"); let s2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
int values[73]; values[73]=5; | int values[73]; if(73<73){{}} else values[73]=5; | Bounds check. | C++ |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
def handle
puts 'message'
end | def handle
puts 'message'
end | Correct. | Ruby |
local foo = 56 | local foo = 56 | Correct. | Lua |
if (a = 38) {{}} | if (a == 38) {{}} | Use ==. | Java |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
val b: Int = 'data' | val b: String = 'data' | Fix type. | Kotlin |
foo | foo() | Add parentheses. | Kotlin |
val data = 63; data = 56 | var data = 63; data = 56 | Use var for reassignment. | Scala |
var data int = 'test' | var data string = 'test' | Type mismatch. | Go |
if (b = 13) | if (b == 13) | Use ==. | C++ |
const user:Person = {{name:'value'}}; | const user:Person = {{name:'value', age:36}}; | Add missing property. | TypeScript |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
let s = String::from("output"); let ref=&s; s.push_str("!"); | let mut s = String::from("output"); let ref=&s; println!("{{}}", ref); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
if (index = 73) | if (index == 73) | Use ==. | Scala |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
val count = 'result' | val count = "result" | Double quotes. | Kotlin |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
let a = 'world' | let a = "world" | Double quotes. | Swift |
c = 96 | c=96 | No spaces. | Shell |
if (num = 5) {{}} | if (num == 5) {{}} | Use ==. | Kotlin |
let item = 31; | let item = 31; | Correct. | JavaScript |
$values[64] | if ($values.Count -gt 64) {{ $values[64] }} | Check bounds. | PowerShell |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
if (b = 5) {{}} | if (b === 5) {{}} | Use === for equality. | JavaScript |
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(24); | const http = require('http'); http.createServer((req,res) => res.end('message')).listen(24); | Correct. | Node.js |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
let a: number = 'message'; | let a: string = 'message'; | Fix type. | TypeScript |
<input type='text' value='world'> | <input type='text' value='world' name='status'> | Add name attribute. | HTML |
$val = 83; if ($val = 83) {{}} | $val = 83; if ($val == 83) {{}} | Use ==. | PHP |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
const c; | const c = 62; | Initialize const. | JavaScript |
list[49] | if (length(list) >= 49) list[49] | Check length. | R |
list.forEach(function(b) {{ console.log(b); }}) | list.forEach((b) => {{ console.log(b); }}) | Arrow functions are cleaner. | JavaScript |
String name = 'output'; | String name = 'output'; | Correct. | Dart |
<div><p>message</div></p> | <div><p>message</p></div> | Nest properly. | HTML |
<person name='output'/> | <person name="output"/> | Double quotes. | XML |
cin >> val
cout << val; | cin >> val;
cout << val; | Add semicolon. | C++ |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
id: value
title: world, | id: value
title: world | Remove comma. | YAML |
System.out.println('message') | System.out.println('message'); | Add semicolon. | Java |
let b = 18; let b = 12; | let b = 18; b = 12; | Duplicate declaration. | JavaScript |
function foo(a:string){{return a;}} foo(93); | function foo(a:string){{return a;}} foo('test'); | Pass correct type. | TypeScript |
if ($c = 15) {{}} | if ($c -eq 15) {{}} | Use -eq. | PowerShell |
int[] items = new int[29];
items[29] = 5; | int[] items = new int[29];
if (29 < items.length) items[29] = 5; | Check bounds. | Java |
class = 'info' | class_name = 'info' | 'class' is a keyword. | Python |
function test() {{ echo 'output'; }} | function test() {{ echo 'output'; }} | Correct. | PHP |
echo 'output' | echo 'output'; | Add semicolon. | PHP |
print('message') | print('message') | Correct. | R |
SELECT * FROM products WHRE name=100; | SELECT * FROM products WHERE name=100; | Fix WHERE. | SQL |
<br></br> | <br> | Self-closing. | HTML |
println('data') | println("data") | Double quotes. | Scala |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
arr[50] | if (arr.indices.contains(50)) arr[50] | Check index. | Kotlin |
def render(temp):
return temp + 1 | def render(temp):
return temp + 1 | Correct. | Python |
jwt.sign({{id:30}}, 'key'); | jwt.sign({{id:30}}, 'key', {{expiresIn:'15m'}}); | Add expiration. | Node.js |
{{'value':'hello'}} | {{"value":"hello"}} | Use double quotes. | JSON |
["value", 2] | ["value", 2] | Correct. | JSON |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.