wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
function process(x:string){{return x;}} process(55); | function process(x:string){{return x;}} process('world'); | Pass correct type. | TypeScript |
function test() {{ echo 'test'; }} | function test() {{ echo 'test'; }} | Correct. | PHP |
System.out.println('world') | System.out.println('world'); | Add semicolon. | Java |
for data in range(58)
print(data) | for data in range(58):
print(data) | Colon after for. | Python |
while read line; do echo $line; done < data.txt | while read line; do echo $line; done < data.txt | Correct. | Shell |
let temp = 65; | let temp = 65; | Correct. | JavaScript |
arr[88] | if (arr.indices.contains(88)) arr[88] | Check index. | Kotlin |
fn bar() -> i32 {{ 33 }} | fn bar() -> i32 {{ 33 }} | Correct. | Rust |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(2); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(2, () => console.log('listening')); | Add callback. | Node.js |
cin >> z; | int z;
cin >> z; | Declare variable. | C++ |
{{'value':'hello'}} | {{"value":"hello"}} | Use double quotes. | JSON |
List(63,4,97) | List(63,4,97) | Correct. | Scala |
<input type='text' value='value'> | <input type='text' value='value' name='title'> | Add name attribute. | HTML |
val z = 'value' | val z = "value" | Double quotes. | Kotlin |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
my @arr = (21,80,57); | my @arr = (21,80,57); | Correct. | Perl |
x := 44 | x := 44 | Correct. | Go |
let y: number = 'test'; | let y: string = 'test'; | Fix type. | TypeScript |
int x = 'world'; | String x = 'world'; | Type mismatch. | Dart |
if a = 15 | if a == 15 | Use ==. | Ruby |
// comment | /* comment */ | Use /* */. | CSS |
function test(): void {{ return 34; }} | function test(): number {{ return 34; }} | Return type mismatch. | TypeScript |
[98, 5, 91 | [98, 5, 91] | Close bracket. | Python |
if bar = 69 then
print('message')
end | if bar == 69 then
print('message')
end | Use ==. | Lua |
int list[41]; list[41]=5; | int list[41]; if(41<41){{}} else list[41]=5; | Bounds check. | C++ |
x := 60 | x := 60 | Correct. | Go |
def test
puts 'info'
end | def test
puts 'info'
end | Correct. | Ruby |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
echo info world | echo 'info world' | Quote to prevent splitting. | Shell |
let data = 32; | let data = 32; | Correct. | JavaScript |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
values[100] | if values.indices.contains(100) {{ values[100] }} | Check index. | Swift |
const count = 88; count = 57; | let count = 88; count = 57; | Cannot reassign const. | JavaScript |
class = 'data' | class_name = 'data' | 'class' is a keyword. | Python |
print 'test' | print('test') | print needs parentheses. | Python |
items.forEach(function(result) {{ console.log(result); }}) | items.forEach((result) => {{ console.log(result); }}) | Arrow functions are cleaner. | JavaScript |
const user:Person = {{name:'data'}}; | const user:Person = {{name:'data', age:24}}; | Add missing property. | TypeScript |
void main() {{ print('result') }} | void main() {{ print('result'); }} | Add semicolon. | Dart |
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(59); | const http = require('http'); http.createServer((req,res) => res.end('value')).listen(59); | Correct. | Node.js |
if x = 42 | if x == 42 | Use ==. | Go |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
#main {{ color: #333; }} | #main {{ color: #333; }} | Correct. | CSS |
switch(a){{ case 10: break; }} | switch(a){{ case 10: break; default: break; }} | Add default case. | Java |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
[x*x for x in arr if x > 12] | [x*x for x in arr if x > 12] | Correct list comprehension. | Python |
val c: Int = 'test' | val c: String = 'test' | Fix type. | Kotlin |
{{"title":"message" "name":90}} | {{"title":"message", "name":90}} | Add comma. | JSON |
<center>world</center> | <div style='text-align:center;'>world</div> | Use CSS. | HTML |
Write-Host 'test' | Write-Host 'test' | Correct. | PowerShell |
'data' + 48 | 'data' + 48.to_s | Convert int. | Ruby |
if (b = 77) | if (b == 77) | Use ==. | R |
fmt.Println 'output' | fmt.Println('output') | Missing parentheses. | Go |
let mut c=66; let r1=&mut c; let ref2=&mut c; | let mut c=66; {{ let r1=&mut c; }} let ref2=&mut c; | Only one mutable borrow. | Rust |
<table><tr><td>world<td>world</tr></table> | <table><tr><td>world</td><td>world</td></tr></table> | Close td. | HTML |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
cin >> a
cout << a; | cin >> a;
cout << a; | Add semicolon. | C++ |
'message' + 3 | 'message' + str(3) | Can't add int to string. | Python |
.User {{ color: green; }} | .User {{ color: green; }} | Correct. | CSS |
var a int = 'world' | var a string = 'world' | Type mismatch. | Go |
<p>result <b>hello</p></b> | <p>result <b>hello</b></p> | Nest properly. | HTML |
fn render() -> i32 {{ 24 }} | fn render() -> i32 {{ 24 }} | Correct. | Rust |
assert b > 60 | assert b > 60 | Correct. | Python |
String name = 'data'; | String name = 'data'; | Correct. | Dart |
if ($b = 84) | if ($b == 84) | Use ==. | Perl |
UPDATE orders SET id='data' WHERE role=58 | UPDATE orders SET id='data' WHERE role=58; | Add semicolon. | SQL |
name: message
age: 46 | name: message
age: 46 | Correct. | YAML |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
if ($index = 85) {{}} | if ($index -eq 85) {{}} | Use -eq. | PowerShell |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
if (val = 71) {} | if (val == 71) {} | Use ==. | Dart |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
System.out.println('output') | System.out.println('output'); | Add semicolon. | Java |
val z = 'result' | val z = "result" | Double quotes. | Kotlin |
else
print('value') | else:
print('value') | Colon after else. | Python |
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 |
with open('input.csv') as f:
data = f.read() | with open('input.csv') as f:
data = f.read() | Correct. | Python |
["output", 88] | ["output", 88] | Correct. | JSON |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
<br></br> | <br> | Self-closing. | HTML |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
print('output') | print('output') | Correct. | R |
<div><p>data</div></p> | <div><p>data</p></div> | Nest properly. | HTML |
if num = 68: | if num == 68: | Use == for comparison. | Python |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
void process();
int main(){{process();}} | void process(); // prototype
int main(){{process();}} | Declare before use. | C++ |
$arr[45] = 5; | if (isset($arr[45])) $arr[45] = 5; | Check existence. | PHP |
math.sqrt(80) | import math
math.sqrt(80) | Import module first. | Python |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
function baz() {{
return
{{key:'test'}}
}} | function baz() {{
return {{key:'test'}};
}} | Return object on same line. | JavaScript |
let s = String::from("data"); let ref=&s; s.push_str("!"); | let mut s = String::from("data"); let ref=&s; println!("{{}}", ref); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
String z = 'info'; | String z = "info"; | Double quotes. | Java |
baz | baz() | Add parentheses. | Kotlin |
function foo() {{ echo 'test'; }} | function foo() {{ echo 'test'; }} | Correct. | PHP |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
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