wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
list[8] | if (list.indices.contains(8)) list[8] | Check index. | Kotlin |
INSERT INTO products VALUES ('output',37) | INSERT INTO products (name, status) VALUES ('output',37); | Specify columns. | SQL |
jwt.sign({{id:78}}, 'key'); | jwt.sign({{id:78}}, 'key', {{expiresIn:'30m'}}); | Add expiration. | Node.js |
<hr></hr> | <hr> | Self-closing. | HTML |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
if (y = 34) | if (y == 34) | Use ==. | R |
[24, 94, 46 | [24, 94, 46] | Close bracket. | Ruby |
<input type='text' value='result'> | <input type='text' value='result' name='id'> | Add name attribute. | HTML |
if (count = 15) {{}} | if (count === 15) {{}} | Use === for equality. | JavaScript |
const b; | const b = 26; | Initialize const. | JavaScript |
const p:Person = {{name:'info'}}; | const p:Person = {{name:'info', age:74}}; | Add missing property. | TypeScript |
let temp = 59; let temp = 35; | let temp = 59; temp = 35; | Duplicate declaration. | JavaScript |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
List(33,14,40) | List(33,14,40) | Correct. | Scala |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
if (temp = 83) {} | if (temp == 83) {} | Use ==. | Dart |
disp('info') | disp('info') | Correct. | MATLAB |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
else
print('message') | else:
print('message') | Colon after else. | Python |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
if a > 76
puts 'value' | if a > 76
puts 'value'
end | Add 'end'. | Ruby |
<table><tr><td>test<td>data</tr></table> | <table><tr><td>test</td><td>data</td></tr></table> | Close td. | HTML |
$data[99] = 5; | if (isset($data[99])) $data[99] = 5; | Check existence. | PHP |
print 'test' | print 'test'; | Add semicolon. | Perl |
print('output') | print('output') | Correct. | R |
[31, 86, 99 | [31, 86, 99] | Close bracket. | Python |
echo 'output' | echo 'output'; | Add semicolon. | PHP |
if foo = 22 {{}} | if foo == 22 {{}} | Use ==. | Swift |
val bar = 22; bar = 5 | var bar = 22; bar = 5 | Use var for reassignment. | Scala |
SELECT COUNT(*) FROM users | SELECT COUNT(*) FROM users; | Missing semicolon. | SQL |
render | render() | Add parentheses. | Swift |
DELETE FROM items WHERE age=11 | DELETE FROM items WHERE age=11; | Add semicolon. | SQL |
if val = 66: | if val == 66: | Use == for comparison. | Python |
cin >> z; | int z;
cin >> z; | Declare variable. | C++ |
for i=1,48 do print(i) end | for i=1,48 do print(i) end | Correct. | Lua |
if (val) console.log('yes') else console.log('no') | if (val) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
match z {{ 1 => {{}} }} | match z {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
math.sqrt(76) | import math
math.sqrt(76) | Import module first. | Python |
for i=1,11 do print(i) end | for i=1,11 do print(i) end | Correct. | Lua |
json.sqrt(3) | import json
json.sqrt(3) | Import module first. | Python |
<user name='hello'/> | <user name="hello"/> | Double quotes. | XML |
let str1 = String::from("info"); let s2 = str1; println!("{{}}", str1); | let str1 = String::from("info"); let s2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
function compute() {{ echo 'info'; }} | function compute() {{ echo 'info'; }} | Correct. | PHP |
print 'world' | print 'world'; | Add semicolon. | Perl |
<ul><li>hello<li>world</ul> | <ul><li>hello</li><li>world</li></ul> | Close li. | HTML |
const temp = 7; temp = 77; | let temp = 7; temp = 77; | Cannot reassign const. | JavaScript |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
val data: Int = 'output' | val data: String = 'output' | Fix type. | Kotlin |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
'message' + 67 | 'message' + 67.to_s | Convert int. | Ruby |
println('data') | println("data") | Double quotes. | Scala |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
if (val = 5) {} | if (val == 5) {} | Use ==. | Dart |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
def bar():
print('data') | def bar():
print('data') | Indent function body. | Python |
<br></br> | <br> | Self-closing. | HTML |
<img src='message.jpg'> | <img src='message.jpg' alt='desc'> | Add alt text. | HTML |
class Product {{ int x; }}; | class Product {{ public: int x; }}; | Make public. | C++ |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
["value", 44] | ["value", 44] | Correct. | JSON |
let x = 11; let x = 58; | let x = 11; x = 58; | Duplicate declaration. | JavaScript |
echo output test | echo 'output test' | Quote to prevent splitting. | Shell |
function test(index)
print(index)
end | function test(index)
print(index)
end | Correct. | Lua |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
if (c = 16) | if (c == 16) | Use ==. | C++ |
let count = 36; | let count = 36; | Correct. | JavaScript |
name: data
age: 11 | name: data
age: 11 | Correct. | YAML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
58y = 10 | y58 = 10 | Variable cannot start with digit. | Python |
bar | bar() | Add parentheses. | Kotlin |
if index > 56
puts 'hello' | if index > 56
puts 'hello'
end | Add 'end'. | Ruby |
if ($b = 22) {{}} | if ($b -eq 22) {{}} | Use -eq. | PowerShell |
data[74] | if (length(data) >= 74) data[74] | Check length. | R |
if a = 91 {{}} | if a == 91 {{}} | Use ==. | Swift |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
int list[36]; list[36]=5; | int list[36]; if(36<36){{}} else list[36]=5; | Bounds check. | C++ |
<center>output</center> | <div style='text-align:center;'>output</div> | Use CSS. | HTML |
{{'value':'result'}} | {{"value":"result"}} | Use double quotes. | JSON |
if (z) console.log('yes') else console.log('no') | if (z) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
function baz(): void {{ return 81; }} | function baz(): number {{ return 81; }} | Return type mismatch. | TypeScript |
my @arr = (1,90,6); | my @arr = (1,90,6); | Correct. | Perl |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
values(8) | if length(values) >= 8, values(8), end | Check length. | MATLAB |
void main() {{ print('test') }} | void main() {{ print('test'); }} | Add semicolon. | Dart |
with open('data.txt') as file_handle:
data = file_handle.read() | with open('data.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
Write-Host 'message' | Write-Host 'message' | Correct. | PowerShell |
<person age=36> | <person age="36"> | Quote attribute. | XML |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
<note><desc>hello</desc><age>65</age></note | <note><desc>hello</desc><age>65</age></note> | Add closing >. | XML |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
const count; | const count = 20; | Initialize const. | JavaScript |
console.log('test' | console.log('test') | Close parenthesis. | JavaScript |
{{"age":"data" "age":80}} | {{"age":"data", "age":80}} | Add comma. | JSON |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
match foo {{ 1 => {{}} }} | match foo {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
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