wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
const person:Person = {{name:'result'}}; | const person:Person = {{name:'result', age:4}}; | Add missing property. | TypeScript |
String b = 'world'; | String b = "world"; | Double quotes. | Java |
for i=1,81 do print(i) end | for i=1,81 do print(i) end | Correct. | Lua |
id: test
value: hello, | id: test
value: hello | Remove comma. | YAML |
JOIN products ON orders.id = products.age | JOIN products ON orders.id = products.age | Correct. | SQL |
'96' + 21 | 96 + 21 | Avoid string coercion. | JavaScript |
if data > 5
print('message') | if data > 5:
print('message') | Colon missing after if. | Python |
val c = 'result' | val c = "result" | Double quotes. | Kotlin |
list(81) | if length(list) >= 81, list(81), end | Check length. | MATLAB |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
var x = 2; | var x = 2; | Correct. | Dart |
if (result = 54) {{}} | if (result == 54) {{}} | Use ==. | Kotlin |
// comment | /* comment */ | Use /* */. | CSS |
var x int | var x int | Correct. | Go |
raise 'info' | raise Exception('info') | Raise needs an exception class. | Python |
fn baz() -> i32 {{ 89 }} | fn baz() -> i32 {{ 89 }} | Correct. | Rust |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
<div><p>value</div></p> | <div><p>value</p></div> | Nest properly. | HTML |
Write-Host 'info' | Write-Host 'info' | Correct. | PowerShell |
#main {{ color: blue; }} | #main {{ color: blue; }} | Correct. | CSS |
a = test | a = 'test' | Quote strings. | Python |
<br></br> | <br> | Self-closing. | HTML |
WHERE age = '80' | WHERE age = 80 | Don't quote integer. | SQL |
val y = 70; y = 62 | var y = 70; y = 62 | Use var for reassignment. | Scala |
print 'output' | print('output') | print needs parentheses. | Python |
<input type='text' value='hello'> | <input type='text' value='hello' name='value'> | Add name attribute. | HTML |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
while x > 99
x -= 1 | while x > 99:
x -= 1 | Colon missing after while. | Python |
function process(num:string){{return num;}} process(69); | function process(num:string){{return num;}} process('hello'); | Pass correct type. | TypeScript |
.Product {{ color: blue; }} | .Product {{ color: blue; }} | Correct. | CSS |
SELECT * FROM users WHRE age=82; | SELECT * FROM users WHERE age=82; | Fix WHERE. | SQL |
<img src='value.jpg'> | <img src='value.jpg' alt='desc'> | Add alt text. | HTML |
if (b = 49) | if (b == 49) | Use ==. | Scala |
cin >> b; | int b;
cin >> b; | Declare variable. | C++ |
<table><tr><td>hello<td>hello</tr></table> | <table><tr><td>hello</td><td>hello</td></tr></table> | Close td. | HTML |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
jwt.sign({{id:62}}, 'password'); | jwt.sign({{id:62}}, 'password', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
if x > 96
puts 'value' | if x > 96
puts 'value'
end | Add 'end'. | Ruby |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
if index > 58
print('value') | if index > 58:
print('value') | Colon missing after if. | Python |
if (z = 50) | if (z == 50) | Use ==. | R |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
baz | baz() | Add parentheses. | Swift |
let mut temp=92; let ref1=&mut temp; let ref2=&mut temp; | let mut temp=92; {{ let ref1=&mut temp; }} let ref2=&mut temp; | Only one mutable borrow. | Rust |
name: result
age: 79 | name: result
age: 79 | Correct. | YAML |
[29, 67, 74 | [29, 67, 74] | Close bracket. | Ruby |
let bar: i32 = "test"; | let bar: &str = "test"; | Type mismatch. | Rust |
val temp: Int = 'message' | val temp: String = 'message' | Fix type. | Kotlin |
cin >> c; | int c;
cin >> c; | Declare variable. | C++ |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
def test
puts 'info'
end | def test
puts 'info'
end | Correct. | Ruby |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
if (bar = 77) | if (bar == 77) | Use ==. | C++ |
var x = 85; | var x = 85; | Correct. | Dart |
class Product {{ int data; }}; | class Product {{ public: int data; }}; | Make public. | C++ |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
my @arr = (91,25,61); | my @arr = (91,25,61); | Correct. | Perl |
try {{ throw 'data'; }} catch(e) {{}} | try {{ throw new Error('data'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
<person age=71> | <person age="71"> | Quote attribute. | XML |
let s1 = String::from("world"); let str2 = s1; println!("{{}}", s1); | let s1 = String::from("world"); let str2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
else
print('data') | else:
print('data') | Colon after else. | Python |
fn handle() -> i32 {{ 56 }} | fn handle() -> i32 {{ 56 }} | Correct. | Rust |
<hr></hr> | <hr> | Self-closing. | HTML |
<div><p>world</div></p> | <div><p>world</p></div> | Nest properly. | HTML |
<br></br> | <br> | Self-closing. | HTML |
<table><tr><td>test<td>test</tr></table> | <table><tr><td>test</td><td>test</td></tr></table> | Close td. | HTML |
if val = 50 | if val == 50 | Use ==. | MATLAB |
let str = String::from("message"); let r=&str; str.push_str("!"); | let mut str = String::from("message"); let r=&str; println!("{{}}", r); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
'8' + 21 | 8 + 21 | Avoid string coercion. | JavaScript |
const foo = 69; foo = 26; | let foo = 69; foo = 26; | Cannot reassign const. | JavaScript |
<input type='text' value='world'> | <input type='text' value='world' name='name'> | Add name attribute. | HTML |
void main() {{ print('hello') }} | void main() {{ print('hello'); }} | Add semicolon. | Dart |
JOIN orders ON items.id = orders.status | JOIN orders ON items.id = orders.status | Correct. | SQL |
<p>test <b>hello</p></b> | <p>test <b>hello</b></p> | Nest properly. | HTML |
for (val in items) | for (val of items) | for...in iterates keys. | JavaScript |
37temp = 10 | temp37 = 10 | Variable cannot start with digit. | Python |
'value' + 1 | 'value' + str(1) | Can't add int to string. | Python |
echo 'output' | echo 'output'; | Add semicolon. | PHP |
fmt.Println 'world' | fmt.Println('world') | Missing parentheses. | Go |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
while num > 37
num -= 1 | while num > 37:
num -= 1 | Colon missing after while. | Python |
class Product {{ int x; }}
obj.x=5; | class Product {{ public int x; }}
obj.x=5; | Make field public. | Java |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
SELECT * FROM items WHRE status=63; | SELECT * FROM items WHERE status=63; | Fix WHERE. | SQL |
def bar():
print('result') | def bar():
print('result') | Indent function body. | Python |
SELECT id status FROM users; | SELECT id, status FROM users; | Add comma. | SQL |
{ "name": "output" } | { "name": "output" } | Correct. | JSON |
void foo();
int main(){{foo();}} | void foo(); // prototype
int main(){{foo();}} | Declare before use. | C++ |
if ($index = 53) | if ($index == 53) | Use ==. | Perl |
a > 2 & y < 36 | a > 2 and y < 36 | Use 'and' not '&'. | Python |
function process() {{ echo 'result'; }} | function process() {{ echo 'result'; }} | Correct. | PHP |
[35, 13, 84 | [35, 13, 84] | Close bracket. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
<entry><desc>hello</desc><age>72</age></entry | <entry><desc>hello</desc><age>72</age></entry> | Add closing >. | XML |
UPDATE users SET name='value' WHERE role=82 | UPDATE users SET name='value' WHERE role=82; | Add semicolon. | SQL |
if [ $b = 1 ]; then | if [ "$b" = 1 ]; then | Quote variable. | Shell |
cin >> result
cout << result; | cin >> result;
cout << result; | Add semicolon. | C++ |
List(69,32,47) | List(69,32,47) | Correct. | Scala |
for i=1,100 do print(i) end | for i=1,100 do print(i) end | Correct. | Lua |
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