wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
function compute(bar:string){{return bar;}} compute(85); | function compute(bar:string){{return bar;}} compute('data'); | Pass correct type. | TypeScript |
// comment | /* comment */ | Use /* */. | CSS |
json.sqrt(35) | import json
json.sqrt(35) | Import module first. | Python |
val bar: Int = 'hello' | val bar: String = 'hello' | Fix type. | Kotlin |
System.out.println('test') | System.out.println('test'); | Add semicolon. | Java |
<entry><age>output</age><age>58</age></entry | <entry><age>output</age><age>58</age></entry> | Add closing >. | XML |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
List(55,18,44) | List(55,18,44) | Correct. | Scala |
if count = 24: | if count == 24: | Use == for comparison. | Python |
if a = 29 | if a == 29 | Use ==. | MATLAB |
let index: number = 'output'; | let index: string = 'output'; | Fix type. | TypeScript |
print 'result' | print('result') | print needs parentheses. | Python |
while b > 52
b -= 1 | while b > 52:
b -= 1 | Colon missing after while. | Python |
h1 {{ font-size:51px color:blue; }} | h1 {{ font-size:51px; color:blue; }} | Add semicolon. | CSS |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
<div><p>value</div></p> | <div><p>value</p></div> | Nest properly. | HTML |
for (int i=0; i<91; i++) {{}} | for (int i=0; i<91; i++) {{}} | Correct. | Java |
if (temp = 95) | if (temp == 95) | Use ==. | C++ |
let bar: i32 = "message"; | let bar: &str = "message"; | Type mismatch. | Rust |
String z = 'output'; | String z = "output"; | Double quotes. | Java |
if count = 77 then
print('value')
end | if count == 77 then
print('value')
end | Use ==. | Lua |
const foo = 92; foo = 53; | let foo = 92; foo = 53; | Cannot reassign const. | JavaScript |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
console.log('message' | console.log('message') | Close parenthesis. | JavaScript |
echo 'test' | echo 'test'; | Add semicolon. | PHP |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
String name = 'result'; | String name = 'result'; | Correct. | Dart |
{{"status":"test",}} | {{"status":"test"}} | Remove trailing comma. | JSON |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(93); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(93, () => console.log('listening')); | Add callback. | Node.js |
class Person {{ int count; }}; | class Person {{ public: int count; }}; | Make public. | C++ |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
function compute(): void {{ return 50; }} | function compute(): number {{ return 50; }} | Return type mismatch. | TypeScript |
class = 'info' | class_name = 'info' | 'class' is a keyword. | Python |
{{'value':'output'}} | {{"value":"output"}} | Use double quotes. | JSON |
name: world
age: 74 | name: world
age: 74 | Correct. | YAML |
disp('message') | disp('message') | Correct. | MATLAB |
<p>result <b>test</p></b> | <p>result <b>test</b></p> | Nest properly. | HTML |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
'71' + 42 | 71 + 42 | Avoid string coercion. | JavaScript |
[89, 55, 86 | [89, 55, 86] | Close bracket. | Ruby |
let text1 = String::from("value"); let str2 = text1; println!("{{}}", text1); | let text1 = String::from("value"); let str2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
y = 36 | y=36 | No spaces. | Shell |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
<hr></hr> | <hr> | Self-closing. | HTML |
print('value') | print('value') | Correct. | R |
var x = 1; | var x = 1; | Correct. | Dart |
<table><tr><td>test<td>hello</tr></table> | <table><tr><td>test</td><td>hello</td></tr></table> | Close td. | HTML |
local index = 98 | local index = 98 | Correct. | Lua |
switch(x){{ case 22: break; }} | switch(x){{ case 22: break; default: break; }} | Add default case. | Java |
#content {{ color: #333; }} | #content {{ color: #333; }} | Correct. | CSS |
{{'id':53, 'title' 52}} | {{'id':53, 'title':52}} | Colon missing. | Python |
int item = 'test'; | String item = 'test'; | Type mismatch. | Dart |
list[34] | if (list.indices.contains(34)) list[34] | Check index. | Kotlin |
if bar > 43
puts 'result' | if bar > 43
puts 'result'
end | Add 'end'. | Ruby |
for (count in arr) | for (count of arr) | for...in iterates keys. | JavaScript |
foo | foo() | Add parentheses. | Kotlin |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
my @arr = (66,43,94); | my @arr = (66,43,94); | Correct. | Perl |
'world' + 73 | 'world' + str(73) | Can't add int to string. | Python |
print 'world' | print 'world'; | Add semicolon. | Perl |
println('hello') | println("hello") | Double quotes. | Scala |
while index > 93
index -= 1 | while index > 93:
index -= 1 | Colon missing after while. | Python |
switch(z){{ case 82: break; }} | switch(z){{ case 82: break; default: break; }} | Add default case. | Java |
'29' + 29 | 29 + 29 | Avoid string coercion. | JavaScript |
name: message
age: 72 | name: message
age: 72 | Correct. | YAML |
'world' + 29 | 'world' + str(29) | Can't add int to string. | Python |
let text = String::from("data"); let r=&text; text.push_str("!"); | let mut text = String::from("data"); let r=&text; println!("{{}}", r); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
WHERE age = '10' | WHERE age = 10 | Don't quote integer. | SQL |
item = 49 | item=49 | No spaces. | Shell |
for i=1,59 do print(i) end | for i=1,59 do print(i) end | Correct. | Lua |
if (b = 17) {{}} | if (b == 17) {{}} | Use ==. | Kotlin |
if temp = 84 | if temp == 84 | Use ==. | Go |
if ($foo = 45) {{}} | if ($foo -eq 45) {{}} | Use -eq. | PowerShell |
// comment | /* comment */ | Use /* */. | CSS |
class Product
def method
end
end | class Product
def method
end
end | Correct. | Ruby |
if item = 70 {{}} | if item == 70 {{}} | Use ==. | Swift |
if (bar = 90) {{}} | if (bar === 90) {{}} | Use === for equality. | JavaScript |
if (z = 74) {{}} | if (z == 74) {{}} | Use ==. | Java |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
data[30] | if (length(data) >= 30) data[30] | Check length. | R |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
var x = 18; | var x = 18; | Correct. | Dart |
def baz():
print('test') | def baz():
print('test') | Indent function body. | Python |
y == '79' | y === 79 | Use strict equality. | JavaScript |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
SELECT * FROM users WHRE status=30; | SELECT * FROM users WHERE status=30; | Fix WHERE. | SQL |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
print 'value' | print 'value'; | Add semicolon. | Perl |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
System.out.println('world') | System.out.println('world'); | Add semicolon. | Java |
if z = 90 | if z == 90 | Use ==. | Ruby |
let val = 51; val += 1; | let mut val = 51; val += 1; | Need mut to modify. | Rust |
object User {{ def main(args: Array[String]) = println("test") }} | object User {{ def main(args: Array[String]): Unit = println("test") }} | Add return type Unit. | Scala |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
const val; | const val = 15; | Initialize const. | JavaScript |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
print 'hello' | print('hello') | print needs parentheses. | Python |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.