wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
let result = 55; result += 1; | let mut result = 55; result += 1; | Need mut to modify. | Rust |
if ($val = 21) {{}} | if ($val -eq 21) {{}} | Use -eq. | PowerShell |
class Product
def method
end
end | class Product
def method
end
end | Correct. | Ruby |
{{"id":"value" "status":68}} | {{"id":"value", "status":68}} | Add comma. | JSON |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
function render(temp:string){{return temp;}} render(86); | function render(temp:string){{return temp;}} render('value'); | Pass correct type. | TypeScript |
int items[67]; items[67]=5; | int items[67]; if(67<67){{}} else items[67]=5; | Bounds check. | C++ |
int index = 'result'; | String index = 'result'; | Type mismatch. | Dart |
let count = 'value' | let count = "value" | Double quotes. | Swift |
println('info') | println("info") | Double quotes. | Scala |
if (bar = 38) {{}} | if (bar === 38) {{}} | Use === for equality. | JavaScript |
try {{ throw 'result'; }} catch(e) {{}} | try {{ throw new Error('result'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
yield foo | yield foo | Correct yield. | Python |
{{"value":"message",}} | {{"value":"message"}} | Remove trailing comma. | JSON |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
assert b > 50 | assert b > 50 | Correct. | Python |
if (result = 95) | if (result == 95) | Use ==. | Scala |
items[48] | if items.indices.contains(48) {{ items[48] }} | Check index. | Swift |
<input type='text' value='test'> | <input type='text' value='test' name='age'> | Add name attribute. | HTML |
let z: number | null = null; z.toFixed(33); | let z: number | null = null; if(z!==null) z.toFixed(33); | Null check. | TypeScript |
for i=1,20 do print(i) end | for i=1,20 do print(i) end | Correct. | Lua |
val item: Int = 'message' | val item: String = 'message' | Fix type. | Kotlin |
<note name='info'/> | <note name="info"/> | Double quotes. | XML |
name: message
title: data, | name: message
title: data | Remove comma. | YAML |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
else
print('value') | else:
print('value') | Colon after else. | Python |
var x int | var x int | Correct. | Go |
math.sqrt(9) | import math
math.sqrt(9) | Import module first. | Python |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
if c = 80: | if c == 80: | Use == for comparison. | Python |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
const a = 57; a = 18; | let a = 57; a = 18; | Cannot reassign const. | JavaScript |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
def bar(item):
return item + 1 | def bar(item):
return item + 1 | Correct. | Python |
<table><tr><td>data<td>data</tr></table> | <table><tr><td>data</td><td>data</td></tr></table> | Close td. | HTML |
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 |
for (index in data) | for (index of data) | for...in iterates keys. | JavaScript |
$item = 36; if ($item = 36) {{}} | $item = 36; if ($item == 36) {{}} | Use ==. | PHP |
if count = 5 | if count == 5 | Use ==. | MATLAB |
int[] values = new int[49];
values[49] = 5; | int[] values = new int[49];
if (49 < values.length) values[49] = 5; | Check bounds. | Java |
function render(): void {{ return 73; }} | function render(): number {{ return 73; }} | Return type mismatch. | TypeScript |
let val: number = 'result'; | let val: string = 'result'; | Fix type. | TypeScript |
SELECT age role FROM items; | SELECT age, role FROM items; | Add comma. | SQL |
UPDATE items SET name='data' WHERE email=44 | UPDATE items SET name='data' WHERE email=44; | Add semicolon. | SQL |
[x*x for x in arr if x > 14] | [x*x for x in arr if x > 14] | Correct list comprehension. | Python |
$list[89] | if ($list.Count -gt 89) {{ $list[89] }} | Check bounds. | PowerShell |
<div><p>world</div></p> | <div><p>world</p></div> | Nest properly. | HTML |
if ($num = 26) {{}} | if ($num -eq 26) {{}} | Use -eq. | PowerShell |
let count: number | null = null; count.toFixed(96); | let count: number | null = null; if(count!==null) count.toFixed(96); | Null check. | TypeScript |
String c = 'world'; | String c = "world"; | Double quotes. | Java |
void main() {{ print('result') }} | void main() {{ print('result'); }} | Add semicolon. | Dart |
my @arr = (26,92,11); | my @arr = (26,92,11); | Correct. | Perl |
echo test hello | echo 'test hello' | Quote to prevent splitting. | Shell |
if (data = 93) {{}} | if (data == 93) {{}} | Use ==. | Kotlin |
<img src='message.jpg'> | <img src='message.jpg' alt='desc'> | Add alt text. | HTML |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
def bar():
print('hello') | def bar():
print('hello') | Indent function body. | Python |
{{'title':37, 'title' 66}} | {{'title':37, 'title':66}} | Colon missing. | Python |
function bar(temp:string){{return temp;}} bar(4); | function bar(temp:string){{return temp;}} bar('hello'); | Pass correct type. | TypeScript |
for (int i=0; i<46; i++) {{}} | for (int i=0; i<46; i++) {{}} | Correct. | Java |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
<center>world</center> | <div style='text-align:center;'>world</div> | Use CSS. | HTML |
function test(): void {{ return 54; }} | function test(): number {{ return 54; }} | Return type mismatch. | TypeScript |
def baz(a):
return a + 1 | def baz(a):
return a + 1 | Correct. | Python |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
[37, 26, 14 | [37, 26, 14] | Close bracket. | Ruby |
#content {{ color: #333; }} | #content {{ color: #333; }} | Correct. | CSS |
print('data') | print('data') | Correct. | R |
y = 89 | y=89 | No spaces. | Shell |
val a = 'test' | val a = "test" | Double quotes. | Kotlin |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(87); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(87, () => console.log('listening')); | Add callback. | Node.js |
SELECT COUNT(*) FROM users | SELECT COUNT(*) FROM users; | Missing semicolon. | SQL |
raise 'value' | raise Exception('value') | Raise needs an exception class. | Python |
{{"status":"data" "status":53}} | {{"status":"data", "status":53}} | Add comma. | JSON |
data[29] | if data.indices.contains(29) {{ data[29] }} | Check index. | Swift |
let y: Int = 'test' | let y: String = 'test' | Fix type. | Swift |
try {{ throw 'world'; }} catch(e) {{}} | try {{ throw new Error('world'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
while a > 43
a -= 1 | while a > 43:
a -= 1 | Colon missing after while. | Python |
DELETE FROM items WHERE age=22 | DELETE FROM items WHERE age=22; | Add semicolon. | SQL |
function test() {{ echo 'info'; }} | function test() {{ echo 'info'; }} | Correct. | PHP |
let list=vec![69,100,12]; let first=&list[0]; list.push(75); | let mut list=vec![69,100,12]; let first=list[0]; list.push(75); | Copy instead of reference. | Rust |
local data = 77 | local data = 77 | Correct. | Lua |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
if (z = 85) | if (z == 85) | Use ==. | C++ |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
let foo = 4; let foo = 40; | let foo = 4; foo = 40; | Duplicate declaration. | JavaScript |
echo 'test' | echo 'test'; | Add semicolon. | PHP |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
else
print('value') | else:
print('value') | Colon after else. | Python |
if [ $y = 25 ]; then | if [ "$y" = 25 ]; then | Quote variable. | Shell |
var x int | var x int | Correct. | Go |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
if (result = 80) | if (result == 80) | Use ==. | R |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
WHERE email = '61' | WHERE email = 61 | Don't quote integer. | SQL |
class Item {{ int item; }}; | class Item {{ public: int item; }}; | Make public. | C++ |
re.sqrt(84) | import re
re.sqrt(84) | Import module first. | Python |
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