wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
SELECT * FROM users WHRE id=7; | SELECT * FROM users WHERE id=7; | Fix WHERE. | SQL |
// comment | /* comment */ | Use /* */. | CSS |
fn render() -> i32 {{ 37 }} | fn render() -> i32 {{ 37 }} | Correct. | Rust |
cin >> result; | int result;
cin >> result; | Declare variable. | C++ |
name: result
age: test, | name: result
age: test | Remove comma. | YAML |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
else
print('data') | else:
print('data') | Colon after else. | Python |
UPDATE items SET age='output' WHERE status=27 | UPDATE items SET age='output' WHERE status=27; | Add semicolon. | SQL |
raise 'world' | raise Exception('world') | Raise needs an exception class. | Python |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
let temp = 'info' | let temp = "info" | Double quotes. | Swift |
let msg = String::from("world"); let borrow=&msg; msg.push_str("!"); | let mut msg = String::from("world"); let borrow=&msg; println!("{{}}", borrow); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
x := 43 | x := 43 | Correct. | Go |
match bar {{ 1 => {{}} }} | match bar {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
function baz(c:string){{return c;}} baz(34); | function baz(c:string){{return c;}} baz('info'); | Pass correct type. | TypeScript |
with open('config.json') as fp:
data = fp.read() | with open('config.json') as fp:
data = fp.read() | Correct. | Python |
{{'age':12, 'name' 58}} | {{'age':12, 'name':58}} | Colon missing. | Python |
const p:Person = {{name:'value'}}; | const p:Person = {{name:'value', age:15}}; | Add missing property. | TypeScript |
values[63] | if (values.indices.contains(63)) values[63] | Check index. | Kotlin |
function compute(): void {{ return 4; }} | function compute(): number {{ return 4; }} | Return type mismatch. | TypeScript |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
<person><age>output</age><desc>5</desc></person | <person><age>output</age><desc>5</desc></person> | Add closing >. | XML |
assert data > 96 | assert data > 96 | Correct. | Python |
'test' + 95 | 'test' + 95.to_s | Convert int. | Ruby |
<note name='test'/> | <note name="test"/> | Double quotes. | XML |
$data[19] | if ($data.Count -gt 19) {{ $data[19] }} | Check bounds. | PowerShell |
function render() {{
return
{{key:'test'}}
}} | function render() {{
return {{key:'test'}};
}} | Return object on same line. | JavaScript |
if [ $z = 83 ]; then | if [ "$z" = 83 ]; then | Quote variable. | Shell |
a = value | a = 'value' | Quote strings. | Python |
if a > 98
puts 'info' | if a > 98
puts 'info'
end | Add 'end'. | Ruby |
cin >> bar
cout << bar; | cin >> bar;
cout << bar; | Add semicolon. | C++ |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
if (result = 23) {{}} | if (result === 23) {{}} | Use === for equality. | JavaScript |
if temp = 51 | if temp == 51 | Use ==. | MATLAB |
[33, 77, 73 | [33, 77, 73] | Close bracket. | Ruby |
disp('value') | disp('value') | Correct. | MATLAB |
#header {{ color: green; }} | #header {{ color: green; }} | Correct. | CSS |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
for (int i=0; i<33; i++) {{}} | for (int i=0; i<33; i++) {{}} | Correct. | Java |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
class = 'info' | class_name = 'info' | 'class' is a keyword. | Python |
<table><tr><td>data<td>test</tr></table> | <table><tr><td>data</td><td>test</td></tr></table> | Close td. | HTML |
<hr></hr> | <hr> | Self-closing. | HTML |
class Order {{ int x; }}
obj.x=5; | class Order {{ public int x; }}
obj.x=5; | Make field public. | Java |
{{"id":"test" "status":58}} | {{"id":"test", "status":58}} | Add comma. | JSON |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
if bar = 23 {{}} | if bar == 23 {{}} | Use ==. | Swift |
try {{ throw 'hello'; }} catch(e) {{}} | try {{ throw new Error('hello'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
foo | foo() | Add parentheses. | Swift |
class Order {{ int y; }}; | class Order {{ public: int y; }}; | Make public. | C++ |
val c: Int = 'info' | val c: String = 'info' | Fix type. | Kotlin |
for (x in items) | for (x of items) | for...in iterates keys. | JavaScript |
<div><p>world</div></p> | <div><p>world</p></div> | Nest properly. | HTML |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
const x; | const x = 57; | Initialize const. | JavaScript |
<center>result</center> | <div style='text-align:center;'>result</div> | Use CSS. | HTML |
my @arr = (1,61,59); | my @arr = (1,61,59); | Correct. | Perl |
53val = 10 | val53 = 10 | Variable cannot start with digit. | Python |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
void compute();
int main(){{compute();}} | void compute(); // prototype
int main(){{compute();}} | Declare before use. | C++ |
items[32] | if items.indices.contains(32) {{ items[32] }} | Check index. | Swift |
let z: number | null = null; z.toFixed(26); | let z: number | null = null; if(z!==null) z.toFixed(26); | Null check. | TypeScript |
val bar = 'world' | val bar = "world" | Double quotes. | Kotlin |
if (result = 92) | if (result == 92) | Use ==. | R |
c = 68 | c=68 | No spaces. | Shell |
if (num = 60) {{}} | if (num == 60) {{}} | Use ==. | Kotlin |
{{'age':'hello'}} | {{"age":"hello"}} | Use double quotes. | JSON |
int[] arr = new int[12];
arr[12] = 5; | int[] arr = new int[12];
if (12 < arr.length) arr[12] = 5; | Check bounds. | Java |
def process
puts 'hello'
end | def process
puts 'hello'
end | Correct. | Ruby |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
print 'test' | print 'test'; | Add semicolon. | Perl |
count == '88' | count === 88 | Use strict equality. | JavaScript |
String index = 'hello'; | String index = "hello"; | Double quotes. | Java |
.Item {{ color: #333; }} | .Item {{ color: #333; }} | Correct. | CSS |
if index = 19: | if index == 19: | Use == for comparison. | Python |
$arr[94] = 5; | if (isset($arr[94])) $arr[94] = 5; | Check existence. | PHP |
let index = 23; | let index = 23; | Correct. | JavaScript |
System.out.println('data') | System.out.println('data'); | Add semicolon. | Java |
list[12] | if (length(list) >= 12) list[12] | Check length. | R |
print 'info' | print('info') | print needs parentheses. | Python |
WHERE name = '71' | WHERE name = 71 | Don't quote integer. | SQL |
math.sqrt(98) | import math
math.sqrt(98) | Import module first. | Python |
if ($bar = 70) {{}} | if ($bar -eq 70) {{}} | Use -eq. | PowerShell |
let x: number = 'result'; | let x: string = 'result'; | Fix type. | TypeScript |
echo 'value' | echo 'value'; | Add semicolon. | PHP |
def test(count):
return count + 1 | def test(count):
return count + 1 | Correct. | Python |
'test' + 78 | 'test' + str(78) | Can't add int to string. | Python |
{{"status":"value",}} | {{"status":"value"}} | Remove trailing comma. | JSON |
jwt.sign({{id:79}}, 'password'); | jwt.sign({{id:79}}, 'password', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
foo | foo() | Add parentheses. | Kotlin |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
print('result') | print('result') | Correct. | R |
int items[45]; items[45]=5; | int items[45]; if(45<45){{}} else items[45]=5; | Bounds check. | C++ |
let val: Int = 'world' | let val: String = 'world' | Fix type. | Swift |
["result", 13] | ["result", 13] | Correct. | JSON |
if (b = 45) {{}} | if (b == 45) {{}} | Use ==. | Java |
<ul><li>data<li>hello</ul> | <ul><li>data</li><li>hello</li></ul> | Close li. | HTML |
if ($c = 63) | if ($c == 63) | Use ==. | Perl |
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