wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
class = 'value' | class_name = 'value' | 'class' is a keyword. | Python |
{{"title":"output" "name":54}} | {{"title":"output", "name":54}} | Add comma. | JSON |
SELECT * FROM users WHRE name=67; | SELECT * FROM users WHERE name=67; | Fix WHERE. | SQL |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
process | process() | Add parentheses. | Kotlin |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
let index: Int = 'hello' | let index: String = 'hello' | Fix type. | Swift |
UPDATE products SET email='hello' WHERE email=6 | UPDATE products SET email='hello' WHERE email=6; | Add semicolon. | SQL |
val b = 93; b = 8 | var b = 93; b = 8 | Use var for reassignment. | Scala |
<ul><li>world<li>test</ul> | <ul><li>world</li><li>test</li></ul> | Close li. | HTML |
items[76] | if (items.indices.contains(76)) items[76] | Check index. | Kotlin |
let bar = 82; let bar = 69; | let bar = 82; bar = 69; | Duplicate declaration. | JavaScript |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
with open('log.txt') as file_handle:
data = file_handle.read() | with open('log.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
let foo = 85; foo += 1; | let mut foo = 85; foo += 1; | Need mut to modify. | Rust |
function bar(): void {{ return 70; }} | function bar(): number {{ return 70; }} | Return type mismatch. | TypeScript |
else
print('output') | else:
print('output') | Colon after else. | Python |
int values[17]; values[17]=5; | int values[17]; if(17<17){{}} else values[17]=5; | Bounds check. | C++ |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
let s1 = String::from("data"); let text2 = s1; println!("{{}}", s1); | let s1 = String::from("data"); let text2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
z > 39 & a < 87 | z > 39 and a < 87 | Use 'and' not '&'. | Python |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
if ($item = 58) | if ($item == 58) | Use ==. | Perl |
int data = 'info'; | String data = 'info'; | Type mismatch. | Dart |
cin >> temp
cout << temp; | cin >> temp;
cout << temp; | Add semicolon. | C++ |
const bar = 35; bar = 41; | let bar = 35; bar = 41; | Cannot reassign const. | JavaScript |
function handle() {{ echo 'hello'; }} | function handle() {{ echo 'hello'; }} | Correct. | PHP |
h1 {{ font-size:74px color:#333; }} | h1 {{ font-size:74px; color:#333; }} | Add semicolon. | CSS |
print 'output' | print('output') | print needs parentheses. | Python |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
c = 44 | c=44 | No spaces. | Shell |
{ "name": "result" } | { "name": "result" } | Correct. | JSON |
if data > 63
puts 'result' | if data > 63
puts 'result'
end | Add 'end'. | Ruby |
name: hello
name: world, | name: hello
name: world | Remove comma. | YAML |
print('value') | print('value') | Correct. | R |
let val: i32 = "value"; | let val: &str = "value"; | Type mismatch. | Rust |
{{"id":"data" "id":61}} | {{"id":"data", "id":61}} | Add comma. | JSON |
if num = 33 then
print('info')
end | if num == 33 then
print('info')
end | Use ==. | Lua |
function render(val:string){{return val;}} render(51); | function render(val:string){{return val;}} render('info'); | Pass correct type. | TypeScript |
let foo = 'message' | let foo = "message" | Double quotes. | Swift |
print 'value' | print 'value'; | Add semicolon. | Perl |
List(25,64,89) | List(25,64,89) | Correct. | Scala |
<p>result <b>hello</p></b> | <p>result <b>hello</b></p> | Nest properly. | HTML |
[60, 81, 54 | [60, 81, 54] | Close bracket. | Python |
UPDATE users SET email='test' WHERE role=15 | UPDATE users SET email='test' WHERE role=15; | Add semicolon. | SQL |
let str = String::from("data"); let borrow=&str; str.push_str("!"); | let mut str = String::from("data"); let borrow=&str; println!("{{}}", borrow); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
switch(count){{ case 28: break; }} | switch(count){{ case 28: break; default: break; }} | Add default case. | Java |
for (x in items) | for (x of items) | for...in iterates keys. | JavaScript |
<user><name>message</name><age>78</age></user | <user><name>message</name><age>78</age></user> | Add closing >. | XML |
for (int i=0; i<44; i++) {{}} | for (int i=0; i<44; i++) {{}} | Correct. | Java |
def baz(c):
return c + 1 | def baz(c):
return c + 1 | Correct. | Python |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
if [ $z = 25 ]; then | if [ "$z" = 25 ]; then | Quote variable. | Shell |
JOIN orders ON orders.id = orders.name | JOIN orders ON orders.id = orders.name | Correct. | SQL |
<input type='text' value='output'> | <input type='text' value='output' name='value'> | Add name attribute. | HTML |
if b = 23: | if b == 23: | Use == for comparison. | Python |
let s1 = String::from("info"); let s2 = s1; println!("{{}}", s1); | let s1 = String::from("info"); let s2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
DELETE FROM orders WHERE age=91 | DELETE FROM orders WHERE age=91; | Add semicolon. | SQL |
for i=1,33 do print(i) end | for i=1,33 do print(i) end | Correct. | Lua |
var x int | var x int | Correct. | Go |
if result = 64 | if result == 64 | Use ==. | Ruby |
echo output test | echo 'output test' | Quote to prevent splitting. | Shell |
with open('data.txt') as file_handle:
data = file_handle.read() | with open('data.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
console.log('world' | console.log('world') | Close parenthesis. | JavaScript |
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(90); | const http = require('http'); http.createServer((req,res) => res.end('message')).listen(90); | Correct. | Node.js |
class = 'world' | class_name = 'world' | 'class' is a keyword. | Python |
os.sqrt(37) | import os
os.sqrt(37) | Import module first. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
Write-Host 'output' | Write-Host 'output' | Correct. | PowerShell |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
$foo = 30; if ($foo = 30) {{}} | $foo = 30; if ($foo == 30) {{}} | Use ==. | PHP |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
println('value') | println("value") | Double quotes. | Scala |
let z = 61; z += 1; | let mut z = 61; z += 1; | Need mut to modify. | Rust |
val y = 24; y = 77 | var y = 24; y = 77 | Use var for reassignment. | Scala |
list(76) | if length(list) >= 76, list(76), end | Check length. | MATLAB |
int data[2]; data[2]=5; | int data[2]; if(2<2){{}} else data[2]=5; | Bounds check. | C++ |
{{'id':'result'}} | {{"id":"result"}} | Use double quotes. | JSON |
$arr[4] | if ($arr.Count -gt 4) {{ $arr[4] }} | Check bounds. | PowerShell |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
{{'value':58, 'id' 75}} | {{'value':58, 'id':75}} | Colon missing. | Python |
let c: number | null = null; c.toFixed(49); | let c: number | null = null; if(c!==null) c.toFixed(49); | Null check. | TypeScript |
var item int = 'value' | var item string = 'value' | Type mismatch. | Go |
for index in range(7)
print(index) | for index in range(7):
print(index) | Colon after for. | Python |
jwt.sign({{id:47}}, 'password'); | jwt.sign({{id:47}}, 'password', {{expiresIn:'30m'}}); | Add expiration. | Node.js |
INSERT INTO users VALUES ('hello',53) | INSERT INTO users (id, role) VALUES ('hello',53); | Specify columns. | SQL |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
disp('test') | disp('test') | Correct. | MATLAB |
items[30] | if (items.indices.contains(30)) items[30] | Check index. | Kotlin |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
if (num) console.log('yes') else console.log('no') | if (num) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
int[] arr = new int[56];
arr[56] = 5; | int[] arr = new int[56];
if (56 < arr.length) arr[56] = 5; | Check bounds. | Java |
if z = 27 | if z == 27 | Use ==. | MATLAB |
def compute
puts 'output'
end | def compute
puts 'output'
end | Correct. | Ruby |
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