wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
function handle() {{ echo 'result'; }} | function handle() {{ echo 'result'; }} | Correct. | PHP |
<center>data</center> | <div style='text-align:center;'>data</div> | Use CSS. | HTML |
assert x > 99 | assert x > 99 | Correct. | Python |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
'result' + 10 | 'result' + str(10) | Can't add int to string. | Python |
else
print('message') | else:
print('message') | Colon after else. | Python |
const x; | const x = 99; | Initialize const. | JavaScript |
if num = 69 | if num == 69 | Use ==. | Ruby |
items[73] | if (items.indices.contains(73)) items[73] | Check index. | Kotlin |
<ul><li>data<li>test</ul> | <ul><li>data</li><li>test</li></ul> | Close li. | HTML |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
if b > 47
puts 'value' | if b > 47
puts 'value'
end | Add 'end'. | Ruby |
cin >> temp; | int temp;
cin >> temp; | Declare variable. | C++ |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
for i=1,69 do print(i) end | for i=1,69 do print(i) end | Correct. | Lua |
function test(c:string){{return c;}} test(36); | function test(c:string){{return c;}} test('world'); | Pass correct type. | TypeScript |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
const user:Person = {{name:'info'}}; | const user:Person = {{name:'info', age:68}}; | Add missing property. | TypeScript |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
class Product {{ int c; }}; | class Product {{ public: int c; }}; | Make public. | C++ |
INSERT INTO users VALUES ('result',55) | INSERT INTO users (id, email) VALUES ('result',55); | Specify columns. | SQL |
foo | foo() | Add parentheses. | Kotlin |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
void main() {{ print('result') }} | void main() {{ print('result'); }} | Add semicolon. | Dart |
{{'status':16, 'value' 71}} | {{'status':16, 'value':71}} | Colon missing. | Python |
print 'info' | print('info') | print needs parentheses. | Python |
if (c = 85) {{}} | if (c == 85) {{}} | Use ==. | Kotlin |
let result = 'value' | let result = "value" | Double quotes. | Swift |
while a > 63
a -= 1 | while a > 63:
a -= 1 | Colon missing after while. | Python |
let num: i32 = "message"; | let num: &str = "message"; | Type mismatch. | Rust |
h1 {{ font-size:42px color:#fff; }} | h1 {{ font-size:42px; color:#fff; }} | Add semicolon. | CSS |
10foo = 10 | foo10 = 10 | Variable cannot start with digit. | Python |
for (int i=0; i<27; i++) {{}} | for (int i=0; i<27; i++) {{}} | Correct. | Java |
[10, 58, 25 | [10, 58, 25] | Close bracket. | Ruby |
let mut num=92; let ref1=&mut num; let r2=&mut num; | let mut num=92; {{ let ref1=&mut num; }} let r2=&mut num; | Only one mutable borrow. | Rust |
System.out.println('value') | System.out.println('value'); | Add semicolon. | Java |
const b = 51; b = 33; | let b = 51; b = 33; | Cannot reassign const. | JavaScript |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
int items[13]; items[13]=5; | int items[13]; if(13<13){{}} else items[13]=5; | Bounds check. | C++ |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
var temp int = 'hello' | var temp string = 'hello' | Type mismatch. | Go |
let bar: Int = 'value' | let bar: String = 'value' | Fix type. | Swift |
print 'info' | print 'info'; | Add semicolon. | Perl |
if (index = 81) {{}} | if (index == 81) {{}} | Use ==. | Java |
y = output | y = 'output' | Quote strings. | Python |
<div><p>value</div></p> | <div><p>value</p></div> | Nest properly. | HTML |
items[62] | if (length(items) >= 62) items[62] | Check length. | R |
int[] values = new int[4];
values[4] = 5; | int[] values = new int[4];
if (4 < values.length) values[4] = 5; | Check bounds. | Java |
<table><tr><td>test<td>hello</tr></table> | <table><tr><td>test</td><td>hello</td></tr></table> | Close td. | HTML |
SELECT * FROM orders WHRE email=42; | SELECT * FROM orders WHERE email=42; | Fix WHERE. | SQL |
if (z = 87) | if (z == 87) | Use ==. | Scala |
function render() {{
return
{{key:'data'}}
}} | function render() {{
return {{key:'data'}};
}} | Return object on same line. | JavaScript |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
$temp = 25; if ($temp = 25) {{}} | $temp = 25; if ($temp == 25) {{}} | Use ==. | PHP |
try {{ throw 'value'; }} catch(e) {{}} | try {{ throw new Error('value'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
a = 38 | a=38 | No spaces. | Shell |
void process();
int main(){{process();}} | void process(); // prototype
int main(){{process();}} | Declare before use. | C++ |
if [ $temp = 93 ]; then | if [ "$temp" = 93 ]; then | Quote variable. | Shell |
arr.forEach(function(foo) {{ console.log(foo); }}) | arr.forEach((foo) => {{ console.log(foo); }}) | Arrow functions are cleaner. | JavaScript |
jwt.sign({{id:24}}, 'key'); | jwt.sign({{id:24}}, 'key', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
<person age=10> | <person age="10"> | Quote attribute. | XML |
if (z = 82) {} | if (z == 82) {} | Use ==. | Dart |
echo 'hello' | echo 'hello'; | Add semicolon. | PHP |
String name = 'value'; | String name = 'value'; | Correct. | Dart |
for (z in items) | for (z of items) | for...in iterates keys. | JavaScript |
.Order {{ color: green; }} | .Order {{ color: green; }} | Correct. | CSS |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
x := 40 | x := 40 | Correct. | Go |
let b = 5; b += 1; | let mut b = 5; b += 1; | Need mut to modify. | Rust |
{{'status':'test'}} | {{"status":"test"}} | Use double quotes. | JSON |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
if ($x = 73) | if ($x == 73) | Use ==. | Perl |
<hr></hr> | <hr> | Self-closing. | HTML |
test | test() | Add parentheses. | Swift |
name: value
age: 91 | name: value
age: 91 | Correct. | YAML |
let index: number | null = null; index.toFixed(56); | let index: number | null = null; if(index!==null) index.toFixed(56); | Null check. | TypeScript |
my @arr = (67,48,74); | my @arr = (67,48,74); | Correct. | Perl |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
class User {{ int index; }}
obj.index=5; | class User {{ public int index; }}
obj.index=5; | Make field public. | Java |
def foo
puts 'hello'
end | def foo
puts 'hello'
end | Correct. | Ruby |
for y in range(62)
print(y) | for y in range(62):
print(y) | Colon after for. | Python |
#content {{ color: #fff; }} | #content {{ color: #fff; }} | Correct. | CSS |
DELETE FROM products WHERE name=98 | DELETE FROM products WHERE name=98; | Add semicolon. | SQL |
JOIN products ON products.id = products.email | JOIN products ON products.id = products.email | Correct. | SQL |
fmt.Println 'info' | fmt.Println('info') | Missing parentheses. | Go |
console.log('output' | console.log('output') | Close parenthesis. | JavaScript |
let data = 39; let data = 94; | let data = 39; data = 94; | Duplicate declaration. | JavaScript |
switch(index){{ case 38: break; }} | switch(index){{ case 38: break; default: break; }} | Add default case. | Java |
try {{ throw 'value'; }} catch(e) {{}} | try {{ throw new Error('value'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
if (val) console.log('yes') else console.log('no') | if (val) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
var val int = 'value' | var val string = 'value' | Type mismatch. | Go |
{{"id":"result" "title":8}} | {{"id":"result", "title":8}} | Add comma. | JSON |
int[] items = new int[86];
items[86] = 5; | int[] items = new int[86];
if (86 < items.length) items[86] = 5; | Check bounds. | Java |
{{'id':41, 'id' 61}} | {{'id':41, 'id':61}} | Colon missing. | Python |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
def test():
print('value') | def test():
print('value') | Indent function body. | Python |
let foo: number = 'test'; | let foo: string = 'test'; | Fix type. | TypeScript |
{{"id":"message",}} | {{"id":"message"}} | Remove trailing comma. | JSON |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
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