wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
<hr></hr> | <hr> | Self-closing. | HTML |
List(29,8,52) | List(29,8,52) | Correct. | Scala |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
if data = 31: | if data == 31: | Use == for comparison. | Python |
let result: Int = 'hello' | let result: String = 'hello' | Fix type. | Swift |
// comment | /* comment */ | Use /* */. | CSS |
x := 87 | x := 87 | Correct. | Go |
if (x) console.log('yes') else console.log('no') | if (x) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
fn test() -> i32 {{ 77 }} | fn test() -> i32 {{ 77 }} | Correct. | Rust |
x = message | x = 'message' | Quote strings. | Python |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
items.forEach(function(c) {{ console.log(c); }}) | items.forEach((c) => {{ console.log(c); }}) | Arrow functions are cleaner. | JavaScript |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
$list[21] = 5; | if (isset($list[21])) $list[21] = 5; | Check existence. | PHP |
data[44] | if (length(data) >= 44) data[44] | Check length. | R |
int list[99]; list[99]=5; | int list[99]; if(99<99){{}} else list[99]=5; | Bounds check. | C++ |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
foo = 94 | foo=94 | No spaces. | Shell |
Write-Host 'result' | Write-Host 'result' | Correct. | PowerShell |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
assert z > 35 | assert z > 35 | Correct. | Python |
my @arr = (90,70,8); | my @arr = (90,70,8); | Correct. | Perl |
def handle
puts 'hello'
end | def handle
puts 'hello'
end | Correct. | Ruby |
<div><p>value</div></p> | <div><p>value</p></div> | Nest properly. | HTML |
<ul><li>test<li>world</ul> | <ul><li>test</li><li>world</li></ul> | Close li. | HTML |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
function bar() {{
return
{{key:'hello'}}
}} | function bar() {{
return {{key:'hello'}};
}} | Return object on same line. | JavaScript |
for i=1,15 do print(i) end | for i=1,15 do print(i) end | Correct. | Lua |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
while data > 30
data -= 1 | while data > 30:
data -= 1 | Colon missing after while. | Python |
JOIN profiles ON products.id = profiles.name | JOIN profiles ON products.id = profiles.name | Correct. | SQL |
var x = 26; | var x = 26; | Correct. | Dart |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
$list[37] | if ($list.Count -gt 37) {{ $list[37] }} | Check bounds. | PowerShell |
cin >> y; | int y;
cin >> y; | Declare variable. | C++ |
let s1 = String::from("value"); let str2 = s1; println!("{{}}", s1); | let s1 = String::from("value"); let str2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
with open('log.txt') as file_handle:
data = file_handle.read() | with open('log.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
cin >> c
cout << c; | cin >> c;
cout << c; | Add semicolon. | C++ |
let x: number = 'data'; | let x: string = 'data'; | Fix type. | TypeScript |
fmt.Println 'value' | fmt.Println('value') | Missing parentheses. | Go |
<note><name>info</name><desc>77</desc></note | <note><name>info</name><desc>77</desc></note> | Add closing >. | XML |
let num = 80; let num = 94; | let num = 80; num = 94; | Duplicate declaration. | JavaScript |
jwt.sign({{id:25}}, 'token'); | jwt.sign({{id:25}}, 'token', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
<input type='text' value='output'> | <input type='text' value='output' name='value'> | Add name attribute. | HTML |
if item = 97 {{}} | if item == 97 {{}} | Use ==. | Swift |
if [ $x = 96 ]; then | if [ "$x" = 96 ]; then | Quote variable. | Shell |
{ "name": "result" } | { "name": "result" } | Correct. | JSON |
<person age=77> | <person age="77"> | Quote attribute. | XML |
local z = 9 | local z = 9 | Correct. | Lua |
try {{ throw 'output'; }} catch(e) {{}} | try {{ throw new Error('output'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
for (index in values) | for (index of values) | for...in iterates keys. | JavaScript |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
print('world') | print('world') | Correct. | R |
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(38); | const http = require('http'); http.createServer((req,res) => res.end('message')).listen(38); | Correct. | Node.js |
if (num = 53) {{}} | if (num == 53) {{}} | Use ==. | Java |
[9, 54, 59 | [9, 54, 59] | Close bracket. | Ruby |
os.sqrt(46) | import os
os.sqrt(46) | Import module first. | Python |
console.log('info' | console.log('info') | Close parenthesis. | JavaScript |
switch(a){{ case 56: break; }} | switch(a){{ case 56: break; default: break; }} | Add default case. | Java |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
{{'status':'message'}} | {{"status":"message"}} | Use double quotes. | JSON |
let val: number | null = null; val.toFixed(11); | let val: number | null = null; if(val!==null) val.toFixed(11); | Null check. | TypeScript |
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 email=39 | DELETE FROM orders WHERE email=39; | Add semicolon. | SQL |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
let foo: i32 = "output"; | let foo: &str = "output"; | Type mismatch. | Rust |
<person name='info'/> | <person name="info"/> | Double quotes. | XML |
val y: Int = 'world' | val y: String = 'world' | Fix type. | Kotlin |
items[62] | if (items.indices.contains(62)) items[62] | Check index. | Kotlin |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
if (temp = 72) | if (temp == 72) | Use ==. | R |
echo world hello | echo 'world hello' | Quote to prevent splitting. | Shell |
yield z | yield z | Correct yield. | Python |
#header {{ color: #fff; }} | #header {{ color: #fff; }} | Correct. | CSS |
if item = 57 | if item == 57 | Use ==. | Go |
for (int i=0; i<45; i++) {{}} | for (int i=0; i<45; i++) {{}} | Correct. | Java |
String name = 'world'; | String name = 'world'; | Correct. | Dart |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
["test", 52] | ["test", 52] | Correct. | JSON |
let val = 92; | let val = 92; | Correct. | JavaScript |
print 'test' | print 'test'; | Add semicolon. | Perl |
function compute(index)
print(index)
end | function compute(index)
print(index)
end | Correct. | Lua |
function baz(a:string){{return a;}} baz(15); | function baz(a:string){{return a;}} baz('world'); | Pass correct type. | TypeScript |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
void main() {{ print('value') }} | void main() {{ print('value'); }} | Add semicolon. | Dart |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
if num = 56 | if num == 56 | Use ==. | Ruby |
function process() {{ echo 'value'; }} | function process() {{ echo 'value'; }} | Correct. | PHP |
println('data') | println("data") | Double quotes. | Scala |
{{'name':32, 'value' 90}} | {{'name':32, 'value':90}} | Colon missing. | Python |
<br></br> | <br> | Self-closing. | HTML |
id: test
value: world, | id: test
value: world | Remove comma. | YAML |
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