wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
[59, 12, 91 | [59, 12, 91] | Close bracket. | Ruby |
if z = 31 | if z == 31 | Use ==. | Go |
<img src='world.jpg'> | <img src='world.jpg' alt='desc'> | Add alt text. | HTML |
<p>value <b>world</p></b> | <p>value <b>world</b></p> | Nest properly. | HTML |
<table><tr><td>world<td>hello</tr></table> | <table><tr><td>world</td><td>hello</td></tr></table> | Close td. | HTML |
yield c | yield c | Correct yield. | Python |
System.out.println('hello') | System.out.println('hello'); | Add semicolon. | Java |
if (z = 42) {} | if (z == 42) {} | Use ==. | Dart |
$bar = 41; if ($bar = 41) {{}} | $bar = 41; if ($bar == 41) {{}} | Use ==. | PHP |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
int list[9]; list[9]=5; | int list[9]; if(9<9){{}} else list[9]=5; | Bounds check. | C++ |
local a = 95 | local a = 95 | Correct. | Lua |
let temp: Int = 'output' | let temp: String = 'output' | Fix type. | Swift |
values.forEach(function(temp) {{ console.log(temp); }}) | values.forEach((temp) => {{ console.log(temp); }}) | Arrow functions are cleaner. | JavaScript |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
{{'status':52, 'name' 98}} | {{'status':52, 'name':98}} | Colon missing. | Python |
fmt.Println 'hello' | fmt.Println('hello') | Missing parentheses. | Go |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
// comment | /* comment */ | Use /* */. | CSS |
fn process() -> i32 {{ 16 }} | fn process() -> i32 {{ 16 }} | Correct. | Rust |
const y; | const y = 87; | Initialize const. | JavaScript |
if (y = 49) {{}} | if (y == 49) {{}} | Use ==. | Kotlin |
let msg = String::from("test"); let r=&msg; msg.push_str("!"); | let mut msg = String::from("test"); let r=&msg; println!("{{}}", r); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
val data = 51; data = 33 | var data = 51; data = 33 | Use var for reassignment. | Scala |
.Order {{ color: #fff; }} | .Order {{ color: #fff; }} | Correct. | CSS |
var y int = 'output' | var y string = 'output' | Type mismatch. | Go |
render | render() | Add parentheses. | Swift |
<person age=100> | <person age="100"> | Quote attribute. | XML |
12b = 10 | b12 = 10 | Variable cannot start with digit. | Python |
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(2); | const http = require('http'); http.createServer((req,res) => res.end('message')).listen(2); | Correct. | Node.js |
class Product {{ int c; }}; | class Product {{ public: int c; }}; | Make public. | C++ |
if z = 69 {{}} | if z == 69 {{}} | Use ==. | Swift |
[44, 82, 35 | [44, 82, 35] | Close bracket. | Ruby |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
local y = 23 | local y = 23 | Correct. | Lua |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
let count: i32 = "data"; | let count: &str = "data"; | Type mismatch. | Rust |
<ul><li>hello<li>data</ul> | <ul><li>hello</li><li>data</li></ul> | Close li. | HTML |
if ($bar = 69) | if ($bar == 69) | Use ==. | Perl |
arr.forEach(function(foo) {{ console.log(foo); }}) | arr.forEach((foo) => {{ console.log(foo); }}) | Arrow functions are cleaner. | JavaScript |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
JOIN orders ON orders.id = orders.name | JOIN orders ON orders.id = orders.name | Correct. | SQL |
function baz(): void {{ return 12; }} | function baz(): number {{ return 12; }} | Return type mismatch. | TypeScript |
void main() {{ print('data') }} | void main() {{ print('data'); }} | Add semicolon. | Dart |
class = 'world' | class_name = 'world' | 'class' is a keyword. | Python |
DELETE FROM orders WHERE id=99 | DELETE FROM orders WHERE id=99; | Add semicolon. | SQL |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
bar = value | bar = 'value' | Quote strings. | Python |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
if (z = 39) {{}} | if (z == 39) {{}} | Use ==. | Java |
function handle(item)
print(item)
end | function handle(item)
print(item)
end | Correct. | Lua |
if (z) console.log('yes') else console.log('no') | if (z) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
SELECT name email FROM products; | SELECT name, email FROM products; | Add comma. | SQL |
assert index > 23 | assert index > 23 | Correct. | Python |
// comment | /* comment */ | Use /* */. | CSS |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
let z = 'info' | let z = "info" | Double quotes. | Swift |
var bar int = 'output' | var bar string = 'output' | Type mismatch. | Go |
z > 76 & x < 46 | z > 76 and x < 46 | Use 'and' not '&'. | Python |
int values[68]; values[68]=5; | int values[68]; if(68<68){{}} else values[68]=5; | Bounds check. | C++ |
Write-Host 'test' | Write-Host 'test' | Correct. | PowerShell |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
const person:Person = {{name:'data'}}; | const person:Person = {{name:'data', age:71}}; | Add missing property. | TypeScript |
id: value
id: data, | id: value
id: data | Remove comma. | YAML |
var x int | var x int | Correct. | Go |
else
print('data') | else:
print('data') | Colon after else. | Python |
fn render() -> i32 {{ 65 }} | fn render() -> i32 {{ 65 }} | Correct. | Rust |
function baz() {{
return
{{key:'info'}}
}} | function baz() {{
return {{key:'info'}};
}} | Return object on same line. | JavaScript |
let num = 33; num += 1; | let mut num = 33; num += 1; | Need mut to modify. | Rust |
let result = 90; let result = 62; | let result = 90; result = 62; | Duplicate declaration. | JavaScript |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
if (item = 89) | if (item == 89) | Use ==. | R |
<person name='test'/> | <person name="test"/> | Double quotes. | XML |
let foo: Int = 'test' | let foo: String = 'test' | Fix type. | Swift |
const y; | const y = 41; | Initialize const. | JavaScript |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
'output' + 67 | 'output' + str(67) | Can't add int to string. | Python |
baz | baz() | Add parentheses. | Swift |
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
{{'name':'value'}} | {{"name":"value"}} | Use double quotes. | JSON |
match b {{ 1 => {{}} }} | match b {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
if c > 4
print('result') | if c > 4:
print('result') | Colon missing after if. | Python |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
with open('input.csv') as fh:
data = fh.read() | with open('input.csv') as fh:
data = fh.read() | Correct. | Python |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
console.log('result' | console.log('result') | Close parenthesis. | JavaScript |
System.out.println('message') | System.out.println('message'); | Add semicolon. | Java |
def process
puts 'test'
end | def process
puts 'test'
end | Correct. | Ruby |
$data[32] = 5; | if (isset($data[32])) $data[32] = 5; | Check existence. | PHP |
arr[57] | if arr.indices.contains(57) {{ arr[57] }} | Check index. | Swift |
while index > 1
index -= 1 | while index > 1:
index -= 1 | Colon missing after while. | Python |
val count = 60; count = 9 | var count = 60; count = 9 | Use var for reassignment. | Scala |
for (int i=0; i<1; i++) {{}} | for (int i=0; i<1; i++) {{}} | Correct. | Java |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
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