wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
#header {{ color: green; }} | #header {{ color: green; }} | Correct. | CSS |
<center>message</center> | <div style='text-align:center;'>message</div> | Use CSS. | HTML |
if (num = 100) {} | if (num == 100) {} | Use ==. | Dart |
disp('world') | disp('world') | Correct. | MATLAB |
if foo > 3
puts 'test' | if foo > 3
puts 'test'
end | Add 'end'. | Ruby |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
if [ $foo = 43 ]; then | if [ "$foo" = 43 ]; then | Quote variable. | Shell |
int[] data = new int[62];
data[62] = 5; | int[] data = new int[62];
if (62 < data.length) data[62] = 5; | Check bounds. | Java |
for (b in arr) | for (b of arr) | for...in iterates keys. | JavaScript |
assert z > 76 | assert z > 76 | Correct. | Python |
let num = 'value' | let num = "value" | Double quotes. | Swift |
println('info') | println("info") | Double quotes. | Scala |
let val: number | null = null; val.toFixed(85); | let val: number | null = null; if(val!==null) val.toFixed(85); | Null check. | TypeScript |
list[62] | if list.indices.contains(62) {{ list[62] }} | Check index. | Swift |
<input type='text' value='data'> | <input type='text' value='data' name='id'> | Add name attribute. | HTML |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
if temp = 58 {{}} | if temp == 58 {{}} | Use ==. | Swift |
DELETE FROM orders WHERE id=96 | DELETE FROM orders WHERE id=96; | Add semicolon. | SQL |
<ul><li>world<li>hello</ul> | <ul><li>world</li><li>hello</li></ul> | Close li. | HTML |
if ($foo = 59) | if ($foo == 59) | Use ==. | Perl |
fn handle() -> i32 {{ 12 }} | fn handle() -> i32 {{ 12 }} | Correct. | Rust |
class User {{ int foo; }}
obj.foo=5; | class User {{ public int foo; }}
obj.foo=5; | Make field public. | Java |
<br></br> | <br> | Self-closing. | HTML |
<p>test <b>data</p></b> | <p>test <b>data</b></p> | Nest properly. | HTML |
function baz() {{ echo 'message'; }} | function baz() {{ echo 'message'; }} | Correct. | PHP |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
UPDATE orders SET email='message' WHERE status=95 | UPDATE orders SET email='message' WHERE status=95; | Add semicolon. | SQL |
Write-Host 'world' | Write-Host 'world' | Correct. | PowerShell |
let list=vec![55,67,44]; let first=&list[0]; list.push(100); | let mut list=vec![55,67,44]; let first=list[0]; list.push(100); | Copy instead of reference. | Rust |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
int num = 'value'; | String num = 'value'; | Type mismatch. | Dart |
$num = 94; if ($num = 94) {{}} | $num = 94; if ($num == 94) {{}} | Use ==. | PHP |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
if foo = 86 then
print('test')
end | if foo == 86 then
print('test')
end | Use ==. | Lua |
compute | compute() | Add parentheses. | Kotlin |
'test' + 84 | 'test' + 84.to_s | Convert int. | Ruby |
JOIN products ON users.id = products.email | JOIN products ON users.id = products.email | Correct. | SQL |
if (c = 74) {{}} | if (c === 74) {{}} | Use === for equality. | JavaScript |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
jwt.sign({{id:31}}, 'token'); | jwt.sign({{id:31}}, 'token', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
yield num | yield num | Correct yield. | Python |
else
print('test') | else:
print('test') | Colon after else. | Python |
if x = 79 | if x == 79 | Use ==. | MATLAB |
int items[93]; items[93]=5; | int items[93]; if(93<93){{}} else items[93]=5; | Bounds check. | C++ |
match val {{ 1 => {{}} }} | match val {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(75); | const http = require('http'); http.createServer((req,res) => res.end('message')).listen(75); | Correct. | Node.js |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
print('test') | print('test') | Correct. | R |
{{'title':'message'}} | {{"title":"message"}} | Use double quotes. | JSON |
let num = 40; | let num = 40; | Correct. | JavaScript |
'value' + 5 | 'value' + str(5) | Can't add int to string. | Python |
if count = 32 | if count == 32 | Use ==. | Ruby |
name: test
id: world, | name: test
id: world | Remove comma. | YAML |
var x int | var x int | Correct. | Go |
'99' + 67 | 99 + 67 | Avoid string coercion. | JavaScript |
52foo = 10 | foo52 = 10 | Variable cannot start with digit. | Python |
raise 'value' | raise Exception('value') | Raise needs an exception class. | Python |
my @arr = (33,80,66); | my @arr = (33,80,66); | Correct. | Perl |
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 |
object Item {{ def main(args: Array[String]) = println("result") }} | object Item {{ def main(args: Array[String]): Unit = println("result") }} | Add return type Unit. | Scala |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
if (z) console.log('yes') else console.log('no') | if (z) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
function compute(z:string){{return z;}} compute(9); | function compute(z:string){{return z;}} compute('result'); | Pass correct type. | TypeScript |
<hr></hr> | <hr> | Self-closing. | HTML |
let bar = 23; let bar = 8; | let bar = 23; bar = 8; | Duplicate declaration. | JavaScript |
void main() {{ print('data') }} | void main() {{ print('data'); }} | Add semicolon. | Dart |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
function render() {{
return
{{key:'world'}}
}} | function render() {{
return {{key:'world'}};
}} | Return object on same line. | JavaScript |
val item: Int = 'test' | val item: String = 'test' | Fix type. | Kotlin |
for foo in range(2)
print(foo) | for foo in range(2):
print(foo) | Colon after for. | Python |
<person age=56> | <person age="56"> | Quote attribute. | XML |
{ "name": "output" } | { "name": "output" } | Correct. | JSON |
bar == '36' | bar === 36 | Use strict equality. | JavaScript |
<div><p>hello</div></p> | <div><p>hello</p></div> | Nest properly. | HTML |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
val c = 52; c = 96 | var c = 52; c = 96 | Use var for reassignment. | Scala |
let bar: number = 'hello'; | let bar: string = 'hello'; | Fix type. | TypeScript |
const bar; | const bar = 80; | Initialize const. | JavaScript |
if temp = 30 | if temp == 30 | Use ==. | Go |
if (val = 57) {{}} | if (val == 57) {{}} | Use ==. | Java |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
json.sqrt(13) | import json
json.sqrt(13) | Import module first. | Python |
b = 27 | b=27 | No spaces. | Shell |
System.out.println('data') | System.out.println('data'); | Add semicolon. | Java |
const z = 94; z = 94; | let z = 94; z = 94; | Cannot reassign const. | JavaScript |
[89, 60, 40 | [89, 60, 40] | Close bracket. | Python |
<person name='value'/> | <person name="value"/> | Double quotes. | XML |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
$values[10] = 5; | if (isset($values[10])) $values[10] = 5; | Check existence. | PHP |
SELECT id status FROM products; | SELECT id, status FROM products; | Add comma. | SQL |
INSERT INTO orders VALUES ('hello',23) | INSERT INTO orders (name, email) VALUES ('hello',23); | Specify columns. | SQL |
try {{ throw 'result'; }} catch(e) {{}} | try {{ throw new Error('result'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
<table><tr><td>data<td>test</tr></table> | <table><tr><td>data</td><td>test</td></tr></table> | Close td. | HTML |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
var item int = 'result' | var item string = 'result' | Type mismatch. | Go |
if (index = 2) | if (index == 2) | Use ==. | Scala |
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