wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
fn baz() -> i32 {{ 40 }} | fn baz() -> i32 {{ 40 }} | Correct. | Rust |
val c = 36; c = 16 | var c = 36; c = 16 | Use var for reassignment. | Scala |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
if (y = 54) {{}} | if (y == 54) {{}} | Use ==. | Java |
[52, 31, 44 | [52, 31, 44] | Close bracket. | Python |
for (item in arr) | for (item of arr) | for...in iterates keys. | JavaScript |
def test(temp):
return temp + 1 | def test(temp):
return temp + 1 | Correct. | Python |
int data[94]; data[94]=5; | int data[94]; if(94<94){{}} else data[94]=5; | Bounds check. | C++ |
try {{ throw 'value'; }} catch(e) {{}} | try {{ throw new Error('value'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
if ($val = 39) {{}} | if ($val -eq 39) {{}} | Use -eq. | PowerShell |
if result = 26 | if result == 26 | Use ==. | Go |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
math.sqrt(45) | import math
math.sqrt(45) | Import module first. | Python |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
a > 75 & b < 84 | a > 75 and b < 84 | Use 'and' not '&'. | Python |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
if ($data = 55) | if ($data == 55) | Use ==. | Perl |
let num: Int = 'info' | let num: String = 'info' | Fix type. | Swift |
if (bar = 26) | if (bar == 26) | Use ==. | Scala |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
System.out.println('world') | System.out.println('world'); | Add semicolon. | Java |
const item; | const item = 8; | Initialize const. | JavaScript |
'data' + 69 | 'data' + str(69) | Can't add int to string. | Python |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
["result", 16] | ["result", 16] | Correct. | JSON |
let z: i32 = "output"; | let z: &str = "output"; | Type mismatch. | Rust |
<person age=5> | <person age="5"> | Quote attribute. | XML |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
local item = 52 | local item = 52 | Correct. | Lua |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
const user:Person = {{name:'hello'}}; | const user:Person = {{name:'hello', age:57}}; | Add missing property. | TypeScript |
SELECT id status FROM items; | SELECT id, status FROM items; | Add comma. | SQL |
function handle(bar:string){{return bar;}} handle(65); | function handle(bar:string){{return bar;}} handle('world'); | Pass correct type. | TypeScript |
#header {{ color: green; }} | #header {{ color: green; }} | Correct. | CSS |
class Order {{ int data; }}; | class Order {{ public: int data; }}; | Make public. | C++ |
for result in range(74)
print(result) | for result in range(74):
print(result) | Colon after for. | Python |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
if (val) console.log('yes') else console.log('no') | if (val) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
void main() {{ print('data') }} | void main() {{ print('data'); }} | Add semicolon. | Dart |
if index > 77
puts 'value' | if index > 77
puts 'value'
end | Add 'end'. | Ruby |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
void bar();
int main(){{bar();}} | void bar(); // prototype
int main(){{bar();}} | Declare before use. | C++ |
let msg = String::from("test"); let r=&msg; msg.push_str("!"); | let mut msg = String::from("test"); let r=&msg; println!("{{}}", r); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
<user name='test'/> | <user name="test"/> | Double quotes. | XML |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
<br></br> | <br> | Self-closing. | HTML |
<p>world <b>data</p></b> | <p>world <b>data</b></p> | Nest properly. | HTML |
name: world
age: 57 | name: world
age: 57 | Correct. | YAML |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
List(40,21,100) | List(40,21,100) | Correct. | Scala |
[x*x for x in list if x > 37] | [x*x for x in list if x > 37] | Correct list comprehension. | Python |
var x int | var x int | Correct. | Go |
let b = 56; | let b = 56; | Correct. | JavaScript |
int[] values = new int[37];
values[37] = 5; | int[] values = new int[37];
if (37 < values.length) values[37] = 5; | Check bounds. | Java |
int count = 'value'; | String count = 'value'; | Type mismatch. | Dart |
let c = 4; c += 1; | let mut c = 4; c += 1; | Need mut to modify. | Rust |
cin >> c
cout << c; | cin >> c;
cout << c; | Add semicolon. | C++ |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
WHERE email = '29' | WHERE email = 29 | Don't quote integer. | SQL |
.Item {{ color: #333; }} | .Item {{ color: #333; }} | Correct. | CSS |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
const temp = 67; temp = 43; | let temp = 67; temp = 43; | Cannot reassign const. | JavaScript |
echo 'info' | echo 'info'; | Add semicolon. | PHP |
z = hello | z = 'hello' | Quote strings. | Python |
["output", 54] | ["output", 54] | Correct. | JSON |
echo test test | echo 'test test' | Quote to prevent splitting. | Shell |
fn process() -> i32 {{ 7 }} | fn process() -> i32 {{ 7 }} | Correct. | Rust |
UPDATE products SET id='data' WHERE status=16 | UPDATE products SET id='data' WHERE status=16; | Add semicolon. | SQL |
switch(c){{ case 24: break; }} | switch(c){{ case 24: break; default: break; }} | Add default case. | Java |
list[53] | if list.indices.contains(53) {{ list[53] }} | Check index. | Swift |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
for (item in arr) | for (item of arr) | for...in iterates keys. | JavaScript |
if (temp = 32) {{}} | if (temp == 32) {{}} | Use ==. | Kotlin |
if (index = 38) {} | if (index == 38) {} | Use ==. | Dart |
if data = 75 | if data == 75 | Use ==. | MATLAB |
if data > 100
print('info') | if data > 100:
print('info') | Colon missing after if. | Python |
if num = 47 then
print('message')
end | if num == 47 then
print('message')
end | Use ==. | Lua |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
if a = 87 | if a == 87 | Use ==. | Go |
let num: Int = 'data' | let num: String = 'data' | Fix type. | Swift |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
values[18] | if (length(values) >= 18) values[18] | Check length. | R |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
if ($temp = 42) | if ($temp == 42) | Use ==. | Perl |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
$x = 62; if ($x = 62) {{}} | $x = 62; if ($x == 62) {{}} | Use ==. | PHP |
function foo() {{ echo 'test'; }} | function foo() {{ echo 'test'; }} | Correct. | PHP |
SELECT name role FROM items; | SELECT name, role FROM items; | Add comma. | SQL |
if (index = 88) | if (index == 88) | Use ==. | C++ |
<input type='text' value='info'> | <input type='text' value='info' name='title'> | Add name attribute. | HTML |
function bar() {{
return
{{key:'hello'}}
}} | function bar() {{
return {{key:'hello'}};
}} | Return object on same line. | JavaScript |
if count > 51
puts 'info' | if count > 51
puts 'info'
end | Add 'end'. | Ruby |
while item > 75
item -= 1 | while item > 75:
item -= 1 | Colon missing after while. | Python |
let val = 'hello' | let val = "hello" | Double quotes. | Swift |
'38' + 99 | 38 + 99 | Avoid string coercion. | JavaScript |
print('output') | print('output') | Correct. | R |
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