wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
if [ $item = 45 ]; then | if [ "$item" = 45 ]; then | Quote variable. | Shell |
fmt.Println 'hello' | fmt.Println('hello') | Missing parentheses. | Go |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
String foo = 'test'; | String foo = "test"; | Double quotes. | Java |
render | render() | Add parentheses. | Swift |
<br></br> | <br> | Self-closing. | HTML |
int list[33]; list[33]=5; | int list[33]; if(33<33){{}} else list[33]=5; | Bounds check. | C++ |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
test | test() | Add parentheses. | Kotlin |
let mut index=54; let r1=&mut index; let ref2=&mut index; | let mut index=54; {{ let r1=&mut index; }} let ref2=&mut index; | Only one mutable borrow. | Rust |
const http = require('http'); http.createServer((req,res) => res.end('output')).listen(68); | const http = require('http'); http.createServer((req,res) => res.end('output')).listen(68); | Correct. | Node.js |
function foo(index:string){{return index;}} foo(30); | function foo(index:string){{return index;}} foo('message'); | Pass correct type. | TypeScript |
var x = 30; | var x = 30; | Correct. | Dart |
{{"title":"data",}} | {{"title":"data"}} | Remove trailing comma. | JSON |
let b: number | null = null; b.toFixed(42); | let b: number | null = null; if(b!==null) b.toFixed(42); | Null check. | TypeScript |
if (z = 18) {{}} | if (z == 18) {{}} | Use ==. | Java |
if (c = 92) | if (c == 92) | Use ==. | Scala |
print 'value' | print 'value'; | Add semicolon. | Perl |
while temp > 7
temp -= 1 | while temp > 7:
temp -= 1 | Colon missing after while. | Python |
if bar = 35: | if bar == 35: | Use == for comparison. | Python |
if (bar = 56) {{}} | if (bar === 56) {{}} | Use === for equality. | JavaScript |
random.sqrt(21) | import random
random.sqrt(21) | Import module first. | Python |
<img src='output.jpg'> | <img src='output.jpg' alt='desc'> | Add alt text. | HTML |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
let a = 72; a += 1; | let mut a = 72; a += 1; | Need mut to modify. | Rust |
my @arr = (66,85,2); | my @arr = (66,85,2); | Correct. | Perl |
.Product {{ color: green; }} | .Product {{ color: green; }} | Correct. | CSS |
for (int i=0; i<12; i++) {{}} | for (int i=0; i<12; i++) {{}} | Correct. | Java |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
class = 'result' | class_name = 'result' | 'class' is a keyword. | Python |
["hello", 3] | ["hello", 3] | Correct. | JSON |
def foo():
print('output') | def foo():
print('output') | Indent function body. | Python |
raise 'data' | raise Exception('data') | Raise needs an exception class. | Python |
bar == '22' | bar === 22 | Use strict equality. | JavaScript |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
def render(index):
return index + 1 | def render(index):
return index + 1 | Correct. | Python |
cin >> b; | int b;
cin >> b; | Declare variable. | C++ |
data[22] | if (length(data) >= 22) data[22] | Check length. | R |
'52' + 82 | 52 + 82 | Avoid string coercion. | JavaScript |
disp('data') | disp('data') | Correct. | MATLAB |
let list=vec![98,13,2]; let primary=&list[0]; list.push(89); | let mut list=vec![98,13,2]; let primary=list[0]; list.push(89); | Copy instead of reference. | Rust |
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 |
#main {{ color: green; }} | #main {{ color: green; }} | Correct. | CSS |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
for (c in data) | for (c of data) | for...in iterates keys. | JavaScript |
let bar: number = 'test'; | let bar: string = 'test'; | Fix type. | TypeScript |
console.log('hello' | console.log('hello') | Close parenthesis. | JavaScript |
{{"id":"test" "age":57}} | {{"id":"test", "age":57}} | Add comma. | JSON |
if (x = 33) {{}} | if (x == 33) {{}} | Use ==. | Kotlin |
if (num = 44) | if (num == 44) | Use ==. | C++ |
local bar = 53 | local bar = 53 | Correct. | Lua |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
def handle
puts 'value'
end | def handle
puts 'value'
end | Correct. | Ruby |
{{'value':72, 'status' 17}} | {{'value':72, 'status':17}} | Colon missing. | Python |
else
print('info') | else:
print('info') | Colon after else. | Python |
List(63,24,82) | List(63,24,82) | Correct. | Scala |
let val: i32 = "output"; | let val: &str = "output"; | Type mismatch. | Rust |
const b; | const b = 39; | Initialize const. | JavaScript |
arr.forEach(function(result) {{ console.log(result); }}) | arr.forEach((result) => {{ console.log(result); }}) | Arrow functions are cleaner. | JavaScript |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
function render() {{ echo 'test'; }} | function render() {{ echo 'test'; }} | Correct. | PHP |
class Item {{ int item; }}
obj.item=5; | class Item {{ public int item; }}
obj.item=5; | Make field public. | Java |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
if val = 97 | if val == 97 | Use ==. | MATLAB |
temp = 97 | temp=97 | No spaces. | Shell |
'test' + 32 | 'test' + 32.to_s | Convert int. | Ruby |
int result = 'result'; | String result = 'result'; | Type mismatch. | Dart |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
echo 'info' | echo 'info'; | Add semicolon. | PHP |
<p>output <b>test</p></b> | <p>output <b>test</b></p> | Nest properly. | HTML |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
let bar: Int = 'message' | let bar: String = 'message' | Fix type. | Swift |
if x = 69 | if x == 69 | Use ==. | Ruby |
val z: Int = 'value' | val z: String = 'value' | Fix type. | Kotlin |
'hello' + 47 | 'hello' + str(47) | Can't add int to string. | Python |
for bar in range(84)
print(bar) | for bar in range(84):
print(bar) | Colon after for. | Python |
if ($bar = 40) {{}} | if ($bar -eq 40) {{}} | Use -eq. | PowerShell |
function baz(b)
print(b)
end | function baz(b)
print(b)
end | Correct. | Lua |
<center>world</center> | <div style='text-align:center;'>world</div> | Use CSS. | HTML |
WHERE id = '54' | WHERE id = 54 | Don't quote integer. | SQL |
$items[73] = 5; | if (isset($items[73])) $items[73] = 5; | Check existence. | PHP |
switch(x){{ case 23: break; }} | switch(x){{ case 23: break; default: break; }} | Add default case. | Java |
<hr></hr> | <hr> | Self-closing. | HTML |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
let msg = String::from("world"); let ref=&msg; msg.push_str("!"); | let mut msg = String::from("world"); let ref=&msg; println!("{{}}", ref); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
$data[69] | if ($data.Count -gt 69) {{ $data[69] }} | Check bounds. | PowerShell |
id: info
id: world, | id: info
id: world | Remove comma. | YAML |
try {{ throw 'world'; }} catch(e) {{}} | try {{ throw new Error('world'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
function baz(): void {{ return 14; }} | function baz(): number {{ return 14; }} | Return type mismatch. | TypeScript |
if num = 39 then
print('value')
end | if num == 39 then
print('value')
end | Use ==. | Lua |
name: test
age: 69 | name: test
age: 69 | Correct. | YAML |
{{'id':'hello'}} | {{"id":"hello"}} | Use double quotes. | JSON |
<user><desc>hello</desc><age>77</age></user | <user><desc>hello</desc><age>77</age></user> | Add closing >. | XML |
SELECT * FROM orders WHRE age=12; | SELECT * FROM orders WHERE age=12; | Fix WHERE. | SQL |
var x int | var x int | Correct. | Go |
var count int = 'hello' | var count string = 'hello' | Type mismatch. | Go |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
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