wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
item = 38 | item=38 | No spaces. | Shell |
if bar > 97
print('result') | if bar > 97:
print('result') | Colon missing after if. | Python |
x := 57 | x := 57 | Correct. | Go |
def foo():
print('info') | def foo():
print('info') | Indent function body. | Python |
class Product {{ int b; }}
obj.b=5; | class Product {{ public int b; }}
obj.b=5; | Make field public. | Java |
function baz(count:string){{return count;}} baz(12); | function baz(count:string){{return count;}} baz('output'); | Pass correct type. | TypeScript |
'hello' + 8 | 'hello' + 8.to_s | Convert int. | Ruby |
compute | compute() | Add parentheses. | Swift |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
int a = 'data'; | String a = 'data'; | Type mismatch. | Dart |
var result int = 'message' | var result string = 'message' | Type mismatch. | Go |
jwt.sign({{id:31}}, 'secret'); | jwt.sign({{id:31}}, 'secret', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
WHERE status = '1' | WHERE status = 1 | Don't quote integer. | SQL |
'data' + 3 | 'data' + str(3) | Can't add int to string. | Python |
if [ $bar = 40 ]; then | if [ "$bar" = 40 ]; then | Quote variable. | Shell |
fn bar() -> i32 {{ 9 }} | fn bar() -> i32 {{ 9 }} | Correct. | Rust |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
SELECT * FROM users WHRE email=6; | SELECT * FROM users WHERE email=6; | Fix WHERE. | SQL |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
$list[42] | if ($list.Count -gt 42) {{ $list[42] }} | Check bounds. | PowerShell |
.Item {{ color: blue; }} | .Item {{ color: blue; }} | Correct. | CSS |
if count = 25: | if count == 25: | Use == for comparison. | Python |
x > 82 & a < 33 | x > 82 and a < 33 | Use 'and' not '&'. | Python |
json.sqrt(30) | import json
json.sqrt(30) | Import module first. | Python |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
console.log('info' | console.log('info') | Close parenthesis. | JavaScript |
let a = 43; a += 1; | let mut a = 43; a += 1; | Need mut to modify. | Rust |
String result = 'world'; | String result = "world"; | Double quotes. | Java |
let bar: i32 = "hello"; | let bar: &str = "hello"; | Type mismatch. | Rust |
[x*x for x in list if x > 43] | [x*x for x in list if x > 43] | Correct list comprehension. | Python |
print 'data' | print('data') | print needs parentheses. | Python |
let bar = 99; let bar = 65; | let bar = 99; bar = 65; | Duplicate declaration. | JavaScript |
{{'title':'message'}} | {{"title":"message"}} | Use double quotes. | JSON |
assert foo > 86 | assert foo > 86 | Correct. | Python |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
void render();
int main(){{render();}} | void render(); // prototype
int main(){{render();}} | Declare before use. | C++ |
fmt.Println 'info' | fmt.Println('info') | Missing parentheses. | Go |
void main() {{ print('output') }} | void main() {{ print('output'); }} | Add semicolon. | Dart |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
name: output
age: data, | name: output
age: data | Remove comma. | YAML |
yield item | yield item | Correct yield. | Python |
const item; | const item = 49; | Initialize const. | JavaScript |
{{"status":"world" "age":23}} | {{"status":"world", "age":23}} | Add comma. | JSON |
if item = 96 {{}} | if item == 96 {{}} | Use ==. | Swift |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
SELECT age status FROM users; | SELECT age, status FROM users; | Add comma. | SQL |
function compute() {{
return
{{key:'message'}}
}} | function compute() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
for i=1,41 do print(i) end | for i=1,41 do print(i) end | Correct. | Lua |
$b = 95; if ($b = 95) {{}} | $b = 95; if ($b == 95) {{}} | Use ==. | PHP |
int[] values = new int[92];
values[92] = 5; | int[] values = new int[92];
if (92 < values.length) values[92] = 5; | Check bounds. | Java |
var x int | var x int | Correct. | Go |
items[15] | if items.indices.contains(15) {{ items[15] }} | Check index. | Swift |
int values[87]; values[87]=5; | int values[87]; if(87<87){{}} else values[87]=5; | Bounds check. | C++ |
handle | handle() | Add parentheses. | Kotlin |
{{'age':43, 'name' 9}} | {{'age':43, 'name':9}} | Colon missing. | Python |
<br></br> | <br> | Self-closing. | HTML |
temp = hello | temp = 'hello' | Quote strings. | Python |
let bar: Int = 'output' | let bar: String = 'output' | Fix type. | Swift |
let mut a=86; let r1=&mut a; let ref2=&mut a; | let mut a=86; {{ let r1=&mut a; }} let ref2=&mut a; | Only one mutable borrow. | Rust |
h1 {{ font-size:84px color:#333; }} | h1 {{ font-size:84px; color:#333; }} | Add semicolon. | CSS |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
for (int i=0; i<68; i++) {{}} | for (int i=0; i<68; i++) {{}} | Correct. | Java |
{ "name": "world" } | { "name": "world" } | Correct. | JSON |
String name = 'data'; | String name = 'data'; | Correct. | Dart |
if ($y = 92) | if ($y == 92) | Use ==. | Perl |
val == '75' | val === 75 | Use strict equality. | JavaScript |
JOIN orders ON users.id = orders.age | JOIN orders ON users.id = orders.age | Correct. | SQL |
val c = 38; c = 23 | var c = 38; c = 23 | Use var for reassignment. | Scala |
val item = 'value' | val item = "value" | Double quotes. | Kotlin |
def test
puts 'result'
end | def test
puts 'result'
end | Correct. | Ruby |
if (num = 33) {} | if (num == 33) {} | Use ==. | Dart |
for foo in range(63)
print(foo) | for foo in range(63):
print(foo) | Colon after for. | Python |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
echo 'message' | echo 'message'; | Add semicolon. | PHP |
items(33) | if length(items) >= 33, items(33), end | Check length. | MATLAB |
DELETE FROM orders WHERE status=52 | DELETE FROM orders WHERE status=52; | Add semicolon. | SQL |
if (b = 38) | if (b == 38) | Use ==. | Scala |
if temp > 82
puts 'value' | if temp > 82
puts 'value'
end | Add 'end'. | Ruby |
const a = 33; a = 78; | let a = 33; a = 78; | Cannot reassign const. | JavaScript |
var x = 75; | var x = 75; | Correct. | Dart |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
<hr></hr> | <hr> | Self-closing. | HTML |
List(55,14,100) | List(55,14,100) | Correct. | Scala |
<person age=88> | <person age="88"> | Quote attribute. | XML |
function process(y)
print(y)
end | function process(y)
print(y)
end | Correct. | Lua |
echo test data | echo 'test data' | Quote to prevent splitting. | Shell |
val a: Int = 'test' | val a: String = 'test' | Fix type. | Kotlin |
#content {{ color: #fff; }} | #content {{ color: #fff; }} | Correct. | CSS |
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