wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
local count = 28 | local count = 28 | Correct. | Lua |
let count: Int = 'test' | let count: String = 'test' | Fix type. | Swift |
39index = 10 | index39 = 10 | Variable cannot start with digit. | Python |
<p>hello <b>hello</p></b> | <p>hello <b>hello</b></p> | Nest properly. | HTML |
val a = 'info' | val a = "info" | Double quotes. | Kotlin |
{{'age':'hello'}} | {{"age":"hello"}} | Use double quotes. | JSON |
else
print('value') | else:
print('value') | Colon after else. | Python |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(98); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(98, () => console.log('listening')); | Add callback. | Node.js |
[21, 30, 83 | [21, 30, 83] | Close bracket. | Python |
test | test() | Add parentheses. | Swift |
void test();
int main(){{test();}} | void test(); // prototype
int main(){{test();}} | Declare before use. | C++ |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
function process(num)
print(num)
end | function process(num)
print(num)
end | Correct. | Lua |
if (bar = 30) {{}} | if (bar == 30) {{}} | Use ==. | Kotlin |
data(44) | if length(data) >= 44, data(44), end | Check length. | MATLAB |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
if (z = 92) {} | if (z == 92) {} | Use ==. | Dart |
JOIN products ON users.id = products.id | JOIN products ON users.id = products.id | Correct. | SQL |
disp('info') | disp('info') | Correct. | MATLAB |
List(24,75,70) | List(24,75,70) | Correct. | Scala |
<table><tr><td>hello<td>test</tr></table> | <table><tr><td>hello</td><td>test</td></tr></table> | Close td. | HTML |
<user name='result'/> | <user name="result"/> | Double quotes. | XML |
{{"name":"world" "id":83}} | {{"name":"world", "id":83}} | Add comma. | JSON |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
[x*x for x in values if x > 13] | [x*x for x in values if x > 13] | Correct list comprehension. | Python |
let foo = 10; let foo = 86; | let foo = 10; foo = 86; | Duplicate declaration. | JavaScript |
$arr[63] = 5; | if (isset($arr[63])) $arr[63] = 5; | Check existence. | PHP |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
function render(foo:string){{return foo;}} render(85); | function render(foo:string){{return foo;}} render('output'); | Pass correct type. | TypeScript |
System.out.println('value') | System.out.println('value'); | Add semicolon. | Java |
val item: Int = 'world' | val item: String = 'world' | Fix type. | Kotlin |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
if y > 54
puts 'world' | if y > 54
puts 'world'
end | Add 'end'. | Ruby |
INSERT INTO users VALUES ('info',96) | INSERT INTO users (id, role) VALUES ('info',96); | Specify columns. | SQL |
class Product {{ int c; }}
obj.c=5; | class Product {{ public int c; }}
obj.c=5; | Make field public. | Java |
val num = 31; num = 3 | var num = 31; num = 3 | Use var for reassignment. | Scala |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
if (foo = 54) {{}} | if (foo == 54) {{}} | Use ==. | Java |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
my @arr = (58,17,36); | my @arr = (58,17,36); | Correct. | Perl |
echo output test | echo 'output test' | Quote to prevent splitting. | Shell |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
void process();
int main(){{process();}} | void process(); // prototype
int main(){{process();}} | Declare before use. | C++ |
jwt.sign({{id:79}}, 'token'); | jwt.sign({{id:79}}, 'token', {{expiresIn:'15m'}}); | Add expiration. | Node.js |
Write-Host 'result' | Write-Host 'result' | Correct. | PowerShell |
try {{ throw 'hello'; }} catch(e) {{}} | try {{ throw new Error('hello'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
if [ $index = 88 ]; then | if [ "$index" = 88 ]; then | Quote variable. | Shell |
'hello' + 50 | 'hello' + 50.to_s | Convert int. | Ruby |
var x int | var x int | Correct. | Go |
data.forEach(function(num) {{ console.log(num); }}) | data.forEach((num) => {{ console.log(num); }}) | Arrow functions are cleaner. | JavaScript |
// comment | /* comment */ | Use /* */. | CSS |
function process(item)
print(item)
end | function process(item)
print(item)
end | Correct. | Lua |
SELECT COUNT(*) FROM users | SELECT COUNT(*) FROM users; | Missing semicolon. | SQL |
else
print('test') | else:
print('test') | Colon after else. | Python |
let vec=vec![42,90,1]; let primary=&vec[0]; vec.push(18); | let mut vec=vec![42,90,1]; let primary=vec[0]; vec.push(18); | Copy instead of reference. | Rust |
print 'info' | print('info') | print needs parentheses. | Python |
name: output
age: 49 | name: output
age: 49 | Correct. | YAML |
def compute(data):
return data + 1 | def compute(data):
return data + 1 | Correct. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
print 'data' | print 'data'; | Add semicolon. | Perl |
cin >> x
cout << x; | cin >> x;
cout << x; | Add semicolon. | C++ |
let a: number | null = null; a.toFixed(87); | let a: number | null = null; if(a!==null) a.toFixed(87); | Null check. | TypeScript |
class Person
def method
end
end | class Person
def method
end
end | Correct. | Ruby |
bar | bar() | Add parentheses. | Kotlin |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
if data = 45 then
print('world')
end | if data == 45 then
print('world')
end | Use ==. | Lua |
[69, 41, 24 | [69, 41, 24] | Close bracket. | Ruby |
local result = 47 | local result = 47 | Correct. | Lua |
<center>output</center> | <div style='text-align:center;'>output</div> | Use CSS. | HTML |
let temp: Int = 'data' | let temp: String = 'data' | Fix type. | Swift |
{{'id':17, 'age' 56}} | {{'id':17, 'age':56}} | Colon missing. | Python |
if foo = 7 | if foo == 7 | Use ==. | Go |
console.log('info' | console.log('info') | Close parenthesis. | JavaScript |
82item = 10 | item82 = 10 | Variable cannot start with digit. | Python |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
echo 'value' | echo 'value'; | Add semicolon. | PHP |
void main() {{ print('output') }} | void main() {{ print('output'); }} | Add semicolon. | Dart |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(58); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(58, () => console.log('listening')); | Add callback. | Node.js |
let text = String::from("output"); let r=&text; text.push_str("!"); | let mut text = String::from("output"); let r=&text; println!("{{}}", r); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
<person age=15> | <person age="15"> | Quote attribute. | XML |
status: world
value: test, | status: world
value: test | Remove comma. | YAML |
WHERE name = '72' | WHERE name = 72 | Don't quote integer. | SQL |
x := 65 | x := 65 | Correct. | Go |
<div><p>info</div></p> | <div><p>info</p></div> | Nest properly. | HTML |
function foo() {{ echo 'world'; }} | function foo() {{ echo 'world'; }} | Correct. | PHP |
let mut val=70; let ref1=&mut val; let r2=&mut val; | let mut val=70; {{ let ref1=&mut val; }} let r2=&mut val; | Only one mutable borrow. | Rust |
JOIN products ON orders.id = products.id | JOIN products ON orders.id = products.id | Correct. | SQL |
let data = 59; | let data = 59; | Correct. | JavaScript |
String bar = 'result'; | String bar = "result"; | Double quotes. | Java |
int[] arr = new int[74];
arr[74] = 5; | int[] arr = new int[74];
if (74 < arr.length) arr[74] = 5; | Check bounds. | Java |
raise 'data' | raise Exception('data') | Raise needs an exception class. | Python |
a == '21' | a === 21 | Use strict equality. | JavaScript |
String name = 'result'; | String name = 'result'; | Correct. | Dart |
int list[63]; list[63]=5; | int list[63]; if(63<63){{}} else list[63]=5; | Bounds check. | C++ |
const count = 36; count = 26; | let count = 36; count = 26; | Cannot reassign const. | JavaScript |
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