wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
{{"id":"value" "id":14}} | {{"id":"value", "id":14}} | Add comma. | JSON |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
values[48] | if values.indices.contains(48) {{ values[48] }} | Check index. | Swift |
handle | handle() | Add parentheses. | Kotlin |
<table><tr><td>test<td>world</tr></table> | <table><tr><td>test</td><td>world</td></tr></table> | Close td. | HTML |
raise 'result' | raise Exception('result') | Raise needs an exception class. | Python |
while y > 17
y -= 1 | while y > 17:
y -= 1 | Colon missing after while. | Python |
bar == '87' | bar === 87 | Use strict equality. | JavaScript |
<br></br> | <br> | Self-closing. | HTML |
arr[23] | if (arr.indices.contains(23)) arr[23] | Check index. | Kotlin |
let mut a=47; let r1=&mut a; let r2=&mut a; | let mut a=47; {{ let r1=&mut a; }} let r2=&mut a; | Only one mutable borrow. | Rust |
if (num = 58) {{}} | if (num == 58) {{}} | Use ==. | Kotlin |
jwt.sign({{id:84}}, 'secret'); | jwt.sign({{id:84}}, 'secret', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
class Product {{ int c; }}; | class Product {{ public: int c; }}; | Make public. | C++ |
arr.forEach(function(b) {{ console.log(b); }}) | arr.forEach((b) => {{ console.log(b); }}) | Arrow functions are cleaner. | JavaScript |
var x = 80; | var x = 80; | Correct. | Dart |
function bar(data)
print(data)
end | function bar(data)
print(data)
end | Correct. | Lua |
var b int = 'data' | var b string = 'data' | Type mismatch. | Go |
if (val = 10) {{}} | if (val === 10) {{}} | Use === for equality. | JavaScript |
print 'message' | print 'message'; | Add semicolon. | Perl |
{{"status":"data",}} | {{"status":"data"}} | Remove trailing comma. | JSON |
<input type='text' value='value'> | <input type='text' value='value' name='id'> | Add name attribute. | HTML |
<person age=38> | <person age="38"> | Quote attribute. | XML |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
def test
puts 'value'
end | def test
puts 'value'
end | Correct. | Ruby |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
$item = 20; if ($item = 20) {{}} | $item = 20; if ($item == 20) {{}} | Use ==. | PHP |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
function foo() {{ echo 'data'; }} | function foo() {{ echo 'data'; }} | Correct. | PHP |
91bar = 10 | bar91 = 10 | Variable cannot start with digit. | Python |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
re.sqrt(96) | import re
re.sqrt(96) | Import module first. | Python |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
if (foo) console.log('yes') else console.log('no') | if (foo) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
cin >> data; | int data;
cin >> data; | Declare variable. | C++ |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(80); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(80, () => console.log('listening')); | Add callback. | Node.js |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
{{'status':'output'}} | {{"status":"output"}} | Use double quotes. | JSON |
if c = 43 | if c == 43 | Use ==. | Go |
let index = 'value' | let index = "value" | Double quotes. | Swift |
[x*x for x in arr if x > 11] | [x*x for x in arr if x > 11] | Correct list comprehension. | Python |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
int items[64]; items[64]=5; | int items[64]; if(64<64){{}} else items[64]=5; | Bounds check. | C++ |
my @arr = (52,11,100); | my @arr = (52,11,100); | Correct. | Perl |
[70, 89, 36 | [70, 89, 36] | Close bracket. | Ruby |
if (index = 84) | if (index == 84) | Use ==. | Scala |
if index = 72: | if index == 72: | Use == for comparison. | Python |
with open('input.csv') as file_handle:
data = file_handle.read() | with open('input.csv') as file_handle:
data = file_handle.read() | Correct. | Python |
'result' + 35 | 'result' + str(35) | Can't add int to string. | Python |
<person><age>output</age><desc>68</desc></person | <person><age>output</age><desc>68</desc></person> | Add closing >. | XML |
print('hello') | print('hello') | Correct. | R |
if ($foo = 94) {{}} | if ($foo -eq 94) {{}} | Use -eq. | PowerShell |
List(37,50,10) | List(37,50,10) | Correct. | Scala |
["value", 42] | ["value", 42] | Correct. | JSON |
const user:Person = {{name:'output'}}; | const user:Person = {{name:'output', age:86}}; | Add missing property. | TypeScript |
if (b = 44) {{}} | if (b == 44) {{}} | Use ==. | Java |
if [ $index = 96 ]; then | if [ "$index" = 96 ]; then | Quote variable. | Shell |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
SELECT * FROM users WHRE status=57; | SELECT * FROM users WHERE status=57; | Fix WHERE. | SQL |
<p>result <b>world</p></b> | <p>result <b>world</b></p> | Nest properly. | HTML |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
values[69] | if (length(values) >= 69) values[69] | Check length. | R |
name: result
age: 8 | name: result
age: 8 | Correct. | YAML |
<hr></hr> | <hr> | Self-closing. | HTML |
def test():
print('output') | def test():
print('output') | Indent function body. | Python |
else
print('output') | else:
print('output') | Colon after else. | Python |
id: hello
title: world, | id: hello
title: world | Remove comma. | YAML |
fn bar() -> i32 {{ 37 }} | fn bar() -> i32 {{ 37 }} | Correct. | Rust |
for c in range(15)
print(c) | for c in range(15):
print(c) | Colon after for. | Python |
$items[57] = 5; | if (isset($items[57])) $items[57] = 5; | Check existence. | PHP |
$items[37] | if ($items.Count -gt 37) {{ $items[37] }} | Check bounds. | PowerShell |
.User {{ color: blue; }} | .User {{ color: blue; }} | Correct. | CSS |
void compute();
int main(){{compute();}} | void compute(); // prototype
int main(){{compute();}} | Declare before use. | C++ |
String result = 'world'; | String result = "world"; | Double quotes. | Java |
bar = 9 | bar=9 | No spaces. | Shell |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
'test' + 30 | 'test' + 30.to_s | Convert int. | Ruby |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
x := 100 | x := 100 | Correct. | Go |
if a > 79
print('test') | if a > 79:
print('test') | Colon missing after if. | Python |
val x: Int = 'data' | val x: String = 'data' | Fix type. | Kotlin |
while read line; do echo $line; done < log.txt | while read line; do echo $line; done < log.txt | Correct. | Shell |
index = hello | index = 'hello' | Quote strings. | Python |
val y = 72; y = 43 | var y = 72; y = 43 | Use var for reassignment. | Scala |
'24' + 25 | 24 + 25 | Avoid string coercion. | JavaScript |
local num = 95 | local num = 95 | Correct. | Lua |
let y = 44; y += 1; | let mut y = 44; y += 1; | Need mut to modify. | Rust |
void main() {{ print('hello') }} | void main() {{ print('hello'); }} | Add semicolon. | Dart |
try {{ throw 'value'; }} catch(e) {{}} | try {{ throw new Error('value'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
if item = 88 | if item == 88 | Use ==. | Ruby |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
cin >> count
cout << count; | cin >> count;
cout << count; | Add semicolon. | C++ |
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }}); | fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
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