wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
function test() {{ echo 'result'; }} | function test() {{ echo 'result'; }} | Correct. | PHP |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
[6, 73, 69 | [6, 73, 69] | Close bracket. | Ruby |
def process():
print('value') | def process():
print('value') | Indent function body. | Python |
int[] values = new int[6];
values[6] = 5; | int[] values = new int[6];
if (6 < values.length) values[6] = 5; | Check bounds. | Java |
<hr></hr> | <hr> | Self-closing. | HTML |
fmt.Println 'hello' | fmt.Println('hello') | Missing parentheses. | Go |
// comment | /* comment */ | Use /* */. | CSS |
let c = 'result' | let c = "result" | Double quotes. | Swift |
$items[80] = 5; | if (isset($items[80])) $items[80] = 5; | Check existence. | PHP |
String bar = 'world'; | String bar = "world"; | Double quotes. | Java |
<table><tr><td>world<td>data</tr></table> | <table><tr><td>world</td><td>data</td></tr></table> | Close td. | HTML |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
<img src='value.jpg'> | <img src='value.jpg' alt='desc'> | Add alt text. | HTML |
INSERT INTO items VALUES ('world',91) | INSERT INTO items (id, role) VALUES ('world',91); | Specify columns. | SQL |
disp('result') | disp('result') | Correct. | MATLAB |
val y = 'output' | val y = "output" | Double quotes. | Kotlin |
SELECT age email FROM products; | SELECT age, email FROM products; | Add comma. | SQL |
data[6] | if (length(data) >= 6) data[6] | Check length. | R |
assert item > 64 | assert item > 64 | Correct. | Python |
<ul><li>data<li>hello</ul> | <ul><li>data</li><li>hello</li></ul> | Close li. | HTML |
for (a in items) | for (a of items) | for...in iterates keys. | JavaScript |
print('data') | print('data') | Correct. | R |
arr.forEach(function(c) {{ console.log(c); }}) | arr.forEach((c) => {{ console.log(c); }}) | Arrow functions are cleaner. | JavaScript |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
echo result data | echo 'result data' | Quote to prevent splitting. | Shell |
else
print('info') | else:
print('info') | Colon after else. | Python |
$values[42] | if ($values.Count -gt 42) {{ $values[42] }} | Check bounds. | PowerShell |
{{'title':'world'}} | {{"title":"world"}} | Use double quotes. | JSON |
b > 1 & x < 95 | b > 1 and x < 95 | Use 'and' not '&'. | Python |
foo = 80 | foo=80 | No spaces. | Shell |
70temp = 10 | temp70 = 10 | Variable cannot start with digit. | Python |
val result: Int = 'info' | val result: String = 'info' | Fix type. | Kotlin |
function compute(item:string){{return item;}} compute(33); | function compute(item:string){{return item;}} compute('message'); | Pass correct type. | TypeScript |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
int list[35]; list[35]=5; | int list[35]; if(35<35){{}} else list[35]=5; | Bounds check. | C++ |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
<p>hello <b>hello</p></b> | <p>hello <b>hello</b></p> | Nest properly. | HTML |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
if (num = 36) {{}} | if (num == 36) {{}} | Use ==. | Kotlin |
WHERE status = '49' | WHERE status = 49 | Don't quote integer. | SQL |
System.out.println('test') | System.out.println('test'); | Add semicolon. | Java |
let c = 93; | let c = 93; | Correct. | JavaScript |
echo 'hello' | echo 'hello'; | Add semicolon. | PHP |
match foo {{ 1 => {{}} }} | match foo {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
cin >> bar; | int bar;
cin >> bar; | Declare variable. | C++ |
h1 {{ font-size:87px color:blue; }} | h1 {{ font-size:87px; color:blue; }} | Add semicolon. | CSS |
const z; | const z = 78; | Initialize const. | JavaScript |
class Order {{ int result; }}
obj.result=5; | class Order {{ public int result; }}
obj.result=5; | Make field public. | Java |
if (val = 89) | if (val == 89) | Use ==. | R |
{{"status":"test" "title":31}} | {{"status":"test", "title":31}} | Add comma. | JSON |
age: result
name: world, | age: result
name: world | Remove comma. | YAML |
jwt.sign({{id:97}}, 'key'); | jwt.sign({{id:97}}, 'key', {{expiresIn:'15m'}}); | Add expiration. | Node.js |
if c = 65 | if c == 65 | Use ==. | Ruby |
'info' + 30 | 'info' + str(30) | Can't add int to string. | Python |
if ($b = 11) {{}} | if ($b -eq 11) {{}} | Use -eq. | PowerShell |
let data: number | null = null; data.toFixed(62); | let data: number | null = null; if(data!==null) data.toFixed(62); | Null check. | TypeScript |
["value", 74] | ["value", 74] | Correct. | JSON |
'8' + 15 | 8 + 15 | Avoid string coercion. | JavaScript |
bar == '7' | bar === 7 | Use strict equality. | JavaScript |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
<user><age>test</age><age>75</age></user | <user><age>test</age><age>75</age></user> | Add closing >. | XML |
def baz(data):
return data + 1 | def baz(data):
return data + 1 | Correct. | Python |
arr[34] | if arr.indices.contains(34) {{ arr[34] }} | Check index. | Swift |
if [ $temp = 61 ]; then | if [ "$temp" = 61 ]; then | Quote variable. | Shell |
raise 'hello' | raise Exception('hello') | Raise needs an exception class. | Python |
if ($temp = 30) | if ($temp == 30) | Use ==. | Perl |
items(98) | if length(items) >= 98, items(98), end | Check length. | MATLAB |
var y int = 'output' | var y string = 'output' | Type mismatch. | Go |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(73); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(73, () => console.log('listening')); | Add callback. | Node.js |
UPDATE products SET status='info' WHERE email=46 | UPDATE products SET status='info' WHERE email=46; | Add semicolon. | SQL |
let item: i32 = "info"; | let item: &str = "info"; | Type mismatch. | Rust |
if y = 9 | if y == 9 | Use ==. | MATLAB |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
print 'info' | print 'info'; | Add semicolon. | Perl |
if (foo = 56) {{}} | if (foo == 56) {{}} | Use ==. | Java |
let mut temp=7; let ref1=&mut temp; let ref2=&mut temp; | let mut temp=7; {{ let ref1=&mut temp; }} let ref2=&mut temp; | Only one mutable borrow. | Rust |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
for b in range(35)
print(b) | for b in range(35):
print(b) | Colon after for. | Python |
if (foo = 77) {{}} | if (foo === 77) {{}} | Use === for equality. | JavaScript |
values[67] | if (values.indices.contains(67)) values[67] | Check index. | Kotlin |
handle | handle() | Add parentheses. | Kotlin |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
x := 43 | x := 43 | Correct. | Go |
<div><p>message</div></p> | <div><p>message</p></div> | Nest properly. | HTML |
if z > 15
print('world') | if z > 15:
print('world') | Colon missing after if. | Python |
if y = 57 | if y == 57 | Use ==. | Go |
<person name='test'/> | <person name="test"/> | Double quotes. | XML |
my @arr = (62,25,83); | my @arr = (62,25,83); | Correct. | Perl |
fn render() -> i32 {{ 71 }} | fn render() -> i32 {{ 71 }} | Correct. | Rust |
def handle
puts 'value'
end | def handle
puts 'value'
end | Correct. | Ruby |
print 'world' | print('world') | print needs parentheses. | Python |
$x = 80; if ($x = 80) {{}} | $x = 80; if ($x == 80) {{}} | Use ==. | PHP |
#footer {{ color: blue; }} | #footer {{ color: blue; }} | Correct. | CSS |
if index > 36
puts 'result' | if index > 36
puts 'result'
end | Add 'end'. | Ruby |
let z: number = 'value'; | let z: string = 'value'; | Fix type. | TypeScript |
{{"title":"value",}} | {{"title":"value"}} | Remove trailing comma. | JSON |
if (result = 17) | if (result == 17) | Use ==. | C++ |
function test() {{
return
{{key:'result'}}
}} | function test() {{
return {{key:'result'}};
}} | Return object on same line. | JavaScript |
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