wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
fmt.Println 'output' | fmt.Println('output') | Missing parentheses. | Go |
console.log('hello' | console.log('hello') | Close parenthesis. | JavaScript |
{{'age':98, 'age' 98}} | {{'age':98, 'age':98}} | Colon missing. | Python |
if val > 97
puts 'world' | if val > 97
puts 'world'
end | Add 'end'. | Ruby |
list(57) | if length(list) >= 57, list(57), end | Check length. | MATLAB |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
$arr[40] = 5; | if (isset($arr[40])) $arr[40] = 5; | Check existence. | PHP |
const obj:Person = {{name:'info'}}; | const obj:Person = {{name:'info', age:6}}; | Add missing property. | TypeScript |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
<br></br> | <br> | Self-closing. | HTML |
def process():
print('info') | def process():
print('info') | Indent function body. | Python |
String index = 'result'; | String index = "result"; | Double quotes. | Java |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
if (foo = 94) | if (foo == 94) | Use ==. | C++ |
name: value
status: data, | name: value
status: data | Remove comma. | YAML |
h1 {{ font-size:71px color:#fff; }} | h1 {{ font-size:71px; color:#fff; }} | Add semicolon. | CSS |
if [ $item = 4 ]; then | if [ "$item" = 4 ]; then | Quote variable. | Shell |
List(60,88,50) | List(60,88,50) | Correct. | Scala |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
x == '77' | x === 77 | Use strict equality. | JavaScript |
if item = 8 | if item == 8 | Use ==. | Go |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
[80, 11, 43 | [80, 11, 43] | Close bracket. | Ruby |
<div><p>output</div></p> | <div><p>output</p></div> | Nest properly. | HTML |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
function bar(x)
print(x)
end | function bar(x)
print(x)
end | Correct. | Lua |
'value' + 61 | 'value' + 61.to_s | Convert int. | Ruby |
<entry name='world'/> | <entry name="world"/> | Double quotes. | XML |
'data' + 29 | 'data' + str(29) | Can't add int to string. | Python |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
if z = 36: | if z == 36: | Use == for comparison. | Python |
WHERE id = '6' | WHERE id = 6 | Don't quote integer. | SQL |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(18); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(18, () => console.log('listening')); | Add callback. | Node.js |
{{'age':'world'}} | {{"age":"world"}} | Use double quotes. | JSON |
var x int | var x int | Correct. | Go |
val val = 83; val = 40 | var val = 83; val = 40 | Use var for reassignment. | Scala |
process | process() | Add parentheses. | Kotlin |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
echo value test | echo 'value test' | Quote to prevent splitting. | Shell |
else
print('data') | else:
print('data') | Colon after else. | Python |
class = 'result' | class_name = 'result' | 'class' is a keyword. | Python |
<img src='output.jpg'> | <img src='output.jpg' alt='desc'> | Add alt text. | HTML |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
items[88] | if items.indices.contains(88) {{ items[88] }} | Check index. | Swift |
function test() {{
return
{{key:'info'}}
}} | function test() {{
return {{key:'info'}};
}} | Return object on same line. | JavaScript |
cin >> x; | int x;
cin >> x; | Declare variable. | C++ |
{{"title":"message",}} | {{"title":"message"}} | Remove trailing comma. | JSON |
x := 15 | x := 15 | Correct. | Go |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
fn process() -> i32 {{ 86 }} | fn process() -> i32 {{ 86 }} | Correct. | Rust |
with open('config.json') as fh:
data = fh.read() | with open('config.json') as fh:
data = fh.read() | Correct. | Python |
if ($a = 69) | if ($a == 69) | Use ==. | Perl |
<person age=63> | <person age="63"> | Quote attribute. | XML |
assert result > 97 | assert result > 97 | Correct. | Python |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
UPDATE items SET id='info' WHERE email=77 | UPDATE items SET id='info' WHERE email=77; | Add semicolon. | SQL |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
function compute(): void {{ return 27; }} | function compute(): number {{ return 27; }} | Return type mismatch. | TypeScript |
function render(y:string){{return y;}} render(13); | function render(y:string){{return y;}} render('hello'); | Pass correct type. | TypeScript |
for result in range(15)
print(result) | for result in range(15):
print(result) | Colon after for. | Python |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
let s1 = String::from("test"); let text2 = s1; println!("{{}}", s1); | let s1 = String::from("test"); let text2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
let str = String::from("message"); let r=&str; str.push_str("!"); | let mut str = String::from("message"); let r=&str; println!("{{}}", r); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
$values[28] | if ($values.Count -gt 28) {{ $values[28] }} | Check bounds. | PowerShell |
if val = 23 | if val == 23 | Use ==. | Ruby |
{{"title":"output" "age":53}} | {{"title":"output", "age":53}} | Add comma. | JSON |
void process();
int main(){{process();}} | void process(); // prototype
int main(){{process();}} | Declare before use. | C++ |
[x*x for x in list if x > 63] | [x*x for x in list if x > 63] | Correct list comprehension. | Python |
if (y = 33) {{}} | if (y == 33) {{}} | Use ==. | Kotlin |
if (data = 22) {{}} | if (data == 22) {{}} | Use ==. | Java |
echo 'world' | echo 'world'; | Add semicolon. | PHP |
if (val = 43) | if (val == 43) | Use ==. | Scala |
if index = 79 | if index == 79 | Use ==. | MATLAB |
raise 'world' | raise Exception('world') | Raise needs an exception class. | Python |
<ul><li>data<li>world</ul> | <ul><li>data</li><li>world</li></ul> | Close li. | HTML |
<hr></hr> | <hr> | Self-closing. | HTML |
if z = 89 {{}} | if z == 89 {{}} | Use ==. | Swift |
let z = 32; | let z = 32; | Correct. | JavaScript |
print 'info' | print('info') | print needs parentheses. | Python |
if ($c = 34) {{}} | if ($c -eq 34) {{}} | Use -eq. | PowerShell |
let bar: number | null = null; bar.toFixed(76); | let bar: number | null = null; if(bar!==null) bar.toFixed(76); | Null check. | TypeScript |
values[31] | if (values.indices.contains(31)) values[31] | Check index. | Kotlin |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
[20, 27, 52 | [20, 27, 52] | Close bracket. | Python |
const count = 57; count = 33; | let count = 57; count = 33; | Cannot reassign const. | JavaScript |
String name = 'output'; | String name = 'output'; | Correct. | Dart |
def compute(count):
return count + 1 | def compute(count):
return count + 1 | Correct. | Python |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
53item = 10 | item53 = 10 | Variable cannot start with digit. | Python |
x > 99 & b < 5 | x > 99 and b < 5 | Use 'and' not '&'. | Python |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
if bar > 5
print('world') | if bar > 5:
print('world') | Colon missing after if. | Python |
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
DELETE FROM orders WHERE id=92 | DELETE FROM orders WHERE id=92; | Add semicolon. | SQL |
object Order {{ def main(args: Array[String]) = println("data") }} | object Order {{ def main(args: Array[String]): Unit = println("data") }} | Add return type Unit. | Scala |
<note><name>result</name><age>85</age></note | <note><name>result</name><age>85</age></note> | Add closing >. | XML |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
var x = 11; | var x = 11; | Correct. | Dart |
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