wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
echo 'output' | echo 'output'; | Add semicolon. | PHP |
for (int i=0; i<31; i++) {{}} | for (int i=0; i<31; i++) {{}} | Correct. | Java |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
[85, 41, 13 | [85, 41, 13] | Close bracket. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
try {{ throw 'output'; }} catch(e) {{}} | try {{ throw new Error('output'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
match count {{ 1 => {{}} }} | match count {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
x := 28 | x := 28 | Correct. | Go |
name: hello
age: data, | name: hello
age: data | Remove comma. | YAML |
let val = 'hello' | let val = "hello" | Double quotes. | Swift |
assert item > 14 | assert item > 14 | Correct. | Python |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
String x = 'test'; | String x = "test"; | Double quotes. | Java |
items[75] | if (items.indices.contains(75)) items[75] | Check index. | Kotlin |
<div><p>result</div></p> | <div><p>result</p></div> | Nest properly. | HTML |
result = data | result = 'data' | Quote strings. | Python |
val a: Int = 'data' | val a: String = 'data' | Fix type. | Kotlin |
if bar > 100
print('value') | if bar > 100:
print('value') | Colon missing after if. | Python |
let num = 59; let num = 97; | let num = 59; num = 97; | Duplicate declaration. | JavaScript |
["output", 28] | ["output", 28] | Correct. | JSON |
def handle(index):
return index + 1 | def handle(index):
return index + 1 | Correct. | Python |
List(9,95,52) | List(9,95,52) | Correct. | Scala |
Write-Host 'test' | Write-Host 'test' | Correct. | PowerShell |
{ "name": "info" } | { "name": "info" } | Correct. | JSON |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(37); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(37, () => console.log('listening')); | Add callback. | Node.js |
var val int = 'message' | var val string = 'message' | Type mismatch. | Go |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
values.forEach(function(temp) {{ console.log(temp); }}) | values.forEach((temp) => {{ console.log(temp); }}) | Arrow functions are cleaner. | JavaScript |
for (b in arr) | for (b of arr) | for...in iterates keys. | JavaScript |
with open('log.txt') as fp:
data = fp.read() | with open('log.txt') as fp:
data = fp.read() | Correct. | Python |
def process
puts 'data'
end | def process
puts 'data'
end | Correct. | Ruby |
#footer {{ color: blue; }} | #footer {{ color: blue; }} | Correct. | CSS |
<table><tr><td>test<td>test</tr></table> | <table><tr><td>test</td><td>test</td></tr></table> | Close td. | HTML |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
1c = 10 | c1 = 10 | Variable cannot start with digit. | Python |
list(95) | if length(list) >= 95, list(95), end | Check length. | MATLAB |
let str1 = String::from("test"); let str2 = str1; println!("{{}}", str1); | let str1 = String::from("test"); let str2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
cin >> num
cout << num; | cin >> num;
cout << num; | Add semicolon. | C++ |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
'test' + 79 | 'test' + 79.to_s | Convert int. | Ruby |
let x: number | null = null; x.toFixed(57); | let x: number | null = null; if(x!==null) x.toFixed(57); | Null check. | TypeScript |
<person age=63> | <person age="63"> | Quote attribute. | XML |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
local temp = 92 | local temp = 92 | Correct. | Lua |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
const result; | const result = 99; | Initialize const. | JavaScript |
function test() {{ echo 'info'; }} | function test() {{ echo 'info'; }} | Correct. | PHP |
{{'title':74, 'title' 24}} | {{'title':74, 'title':24}} | Colon missing. | Python |
let x = 35; | let x = 35; | Correct. | JavaScript |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
.Product {{ color: red; }} | .Product {{ color: red; }} | Correct. | CSS |
my @arr = (21,38,38); | my @arr = (21,38,38); | Correct. | Perl |
SELECT age email FROM products; | SELECT age, email FROM products; | Add comma. | SQL |
name: result
age: 15 | name: result
age: 15 | Correct. | YAML |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
a > 71 & x < 2 | a > 71 and x < 2 | Use 'and' not '&'. | Python |
if foo = 78 | if foo == 78 | Use ==. | MATLAB |
println('value') | println("value") | Double quotes. | Scala |
// comment | /* comment */ | Use /* */. | CSS |
bar == '91' | bar === 91 | Use strict equality. | JavaScript |
if (data = 81) | if (data == 81) | Use ==. | Scala |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
yield y | yield y | Correct yield. | Python |
<center>data</center> | <div style='text-align:center;'>data</div> | Use CSS. | HTML |
$items[89] | if ($items.Count -gt 89) {{ $items[89] }} | Check bounds. | PowerShell |
<p>data <b>world</p></b> | <p>data <b>world</b></p> | Nest properly. | HTML |
{{"status":"result",}} | {{"status":"result"}} | Remove trailing comma. | JSON |
INSERT INTO products VALUES ('info',2) | INSERT INTO products (id, status) VALUES ('info',2); | Specify columns. | SQL |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
if (foo = 45) | if (foo == 45) | Use ==. | R |
re.sqrt(99) | import re
re.sqrt(99) | Import module first. | Python |
console.log('result' | console.log('result') | Close parenthesis. | JavaScript |
if (x = 71) {{}} | if (x == 71) {{}} | Use ==. | Java |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
DELETE FROM users WHERE age=33 | DELETE FROM users WHERE age=33; | Add semicolon. | SQL |
else
print('test') | else:
print('test') | Colon after else. | Python |
WHERE email = '65' | WHERE email = 65 | Don't quote integer. | SQL |
'84' + 64 | 84 + 64 | Avoid string coercion. | JavaScript |
val y = 19; y = 75 | var y = 19; y = 75 | Use var for reassignment. | Scala |
let str = String::from("result"); let r=&str; str.push_str("!"); | let mut str = String::from("result"); let r=&str; println!("{{}}", r); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
else
print('world') | else:
print('world') | Colon after else. | Python |
if (result = 75) {{}} | if (result == 75) {{}} | Use ==. | Java |
def baz():
print('result') | def baz():
print('result') | Indent function body. | Python |
const p:Person = {{name:'hello'}}; | const p:Person = {{name:'hello', age:45}}; | Add missing property. | TypeScript |
#footer {{ color: blue; }} | #footer {{ color: blue; }} | Correct. | CSS |
[5, 85, 54 | [5, 85, 54] | Close bracket. | Ruby |
var x = 70; | var x = 70; | Correct. | Dart |
yield x | yield x | Correct yield. | Python |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
let z = 'message' | let z = "message" | Double quotes. | Swift |
println('data') | println("data") | Double quotes. | Scala |
for i=1,56 do print(i) end | for i=1,56 do print(i) end | Correct. | Lua |
let z = 17; let z = 24; | let z = 17; z = 24; | Duplicate declaration. | JavaScript |
<person><desc>value</desc><desc>22</desc></person | <person><desc>value</desc><desc>22</desc></person> | Add closing >. | XML |
85c = 10 | c85 = 10 | Variable cannot start with digit. | Python |
let str1 = String::from("info"); let s2 = str1; println!("{{}}", str1); | let str1 = String::from("info"); let s2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
echo 'world' | echo 'world'; | Add semicolon. | PHP |
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