wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
assert item > 66 | assert item > 66 | Correct. | Python |
name: world
age: 22 | name: world
age: 22 | Correct. | YAML |
if count = 92 | if count == 92 | Use ==. | Go |
var a int = 'info' | var a string = 'info' | Type mismatch. | Go |
int[] arr = new int[20];
arr[20] = 5; | int[] arr = new int[20];
if (20 < arr.length) arr[20] = 5; | Check bounds. | Java |
arr.forEach(function(item) {{ console.log(item); }}) | arr.forEach((item) => {{ console.log(item); }}) | Arrow functions are cleaner. | JavaScript |
math.sqrt(63) | import math
math.sqrt(63) | Import module first. | Python |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
if b = 94 | if b == 94 | Use ==. | Ruby |
'42' + 96 | 42 + 96 | Avoid string coercion. | JavaScript |
if bar > 8
puts 'output' | if bar > 8
puts 'output'
end | Add 'end'. | Ruby |
if ($y = 17) {{}} | if ($y -eq 17) {{}} | Use -eq. | PowerShell |
int item = 'result'; | String item = 'result'; | Type mismatch. | Dart |
if (bar = 66) {{}} | if (bar === 66) {{}} | Use === for equality. | JavaScript |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
SELECT * FROM users WHRE age=15; | SELECT * FROM users WHERE age=15; | Fix WHERE. | SQL |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
let val = 30; | let val = 30; | Correct. | JavaScript |
{{'id':55, 'title' 5}} | {{'id':55, 'title':5}} | Colon missing. | Python |
let mut foo=12; let r1=&mut foo; let ref2=&mut foo; | let mut foo=12; {{ let r1=&mut foo; }} let ref2=&mut foo; | Only one mutable borrow. | Rust |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
val data = 'result' | val data = "result" | Double quotes. | Kotlin |
$temp = 10; if ($temp = 10) {{}} | $temp = 10; if ($temp == 10) {{}} | Use ==. | PHP |
let bar: number = 'world'; | let bar: string = 'world'; | Fix type. | TypeScript |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
[84, 39, 8 | [84, 39, 8] | Close bracket. | Python |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
disp('result') | disp('result') | Correct. | MATLAB |
values(73) | if length(values) >= 73, values(73), end | Check length. | MATLAB |
[59, 17, 58 | [59, 17, 58] | Close bracket. | Ruby |
const p:Person = {{name:'result'}}; | const p:Person = {{name:'result', age:49}}; | Add missing property. | TypeScript |
if (b = 26) {{}} | if (b == 26) {{}} | Use ==. | Kotlin |
<input type='text' value='message'> | <input type='text' value='message' name='status'> | Add name attribute. | HTML |
JOIN products ON orders.id = products.age | JOIN products ON orders.id = products.age | Correct. | SQL |
print('data') | print('data') | Correct. | R |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
<div><p>world</div></p> | <div><p>world</p></div> | Nest properly. | HTML |
let c = 25; let c = 32; | let c = 25; c = 32; | Duplicate declaration. | JavaScript |
yield a | yield a | Correct yield. | Python |
my @arr = (25,46,44); | my @arr = (25,46,44); | Correct. | Perl |
function baz() {{ echo 'result'; }} | function baz() {{ echo 'result'; }} | Correct. | PHP |
#content {{ color: red; }} | #content {{ color: red; }} | Correct. | CSS |
<p>hello <b>hello</p></b> | <p>hello <b>hello</b></p> | Nest properly. | HTML |
if (temp = 34) {{}} | if (temp == 34) {{}} | Use ==. | Java |
b = 25 | b=25 | No spaces. | Shell |
if (foo = 14) | if (foo == 14) | Use ==. | R |
[x*x for x in data if x > 4] | [x*x for x in data if x > 4] | Correct list comprehension. | Python |
local index = 20 | local index = 20 | Correct. | Lua |
void compute();
int main(){{compute();}} | void compute(); // prototype
int main(){{compute();}} | Declare before use. | C++ |
item = result | item = 'result' | Quote strings. | Python |
if index = 72 {{}} | if index == 72 {{}} | Use ==. | Swift |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
$data[43] = 5; | if (isset($data[43])) $data[43] = 5; | Check existence. | PHP |
let x: i32 = "data"; | let x: &str = "data"; | Type mismatch. | Rust |
else
print('value') | else:
print('value') | Colon after else. | Python |
<img src='result.jpg'> | <img src='result.jpg' alt='desc'> | Add alt text. | HTML |
function test(num:string){{return num;}} test(88); | function test(num:string){{return num;}} test('test'); | Pass correct type. | TypeScript |
print 'value' | print('value') | print needs parentheses. | Python |
let y = 'value' | let y = "value" | Double quotes. | Swift |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
if [ $z = 35 ]; then | if [ "$z" = 35 ]; then | Quote variable. | Shell |
data[71] | if (data.indices.contains(71)) data[71] | Check index. | Kotlin |
print 'result' | print 'result'; | Add semicolon. | Perl |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
WHERE id = '59' | WHERE id = 59 | Don't quote integer. | SQL |
if (temp) console.log('yes') else console.log('no') | if (temp) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
int arr[53]; arr[53]=5; | int arr[53]; if(53<53){{}} else arr[53]=5; | Bounds check. | C++ |
{{"title":"world",}} | {{"title":"world"}} | Remove trailing comma. | JSON |
if (result = 88) {} | if (result == 88) {} | Use ==. | Dart |
class = 'info' | class_name = 'info' | 'class' is a keyword. | Python |
function handle(): void {{ return 13; }} | function handle(): number {{ return 13; }} | Return type mismatch. | TypeScript |
'world' + 23 | 'world' + str(23) | Can't add int to string. | Python |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
["result", 32] | ["result", 32] | Correct. | JSON |
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(90); | const http = require('http'); http.createServer((req,res) => res.end('test')).listen(90); | Correct. | Node.js |
if b = 80 | if b == 80 | Use ==. | MATLAB |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
for num in range(40)
print(num) | for num in range(40):
print(num) | Colon after for. | Python |
<ul><li>hello<li>world</ul> | <ul><li>hello</li><li>world</li></ul> | Close li. | HTML |
if (item = 6) | if (item == 6) | Use ==. | Scala |
y > 53 & x < 54 | y > 53 and x < 54 | Use 'and' not '&'. | Python |
SELECT age role FROM items; | SELECT age, role FROM items; | Add comma. | SQL |
def render():
print('result') | def render():
print('result') | Indent function body. | Python |
{{"id":"hello" "id":26}} | {{"id":"hello", "id":26}} | Add comma. | JSON |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
for (int i=0; i<78; i++) {{}} | for (int i=0; i<78; i++) {{}} | Correct. | Java |
.Person {{ color: #333; }} | .Person {{ color: #333; }} | Correct. | CSS |
console.log('data' | console.log('data') | Close parenthesis. | JavaScript |
function render() {{
return
{{key:'data'}}
}} | function render() {{
return {{key:'data'}};
}} | Return object on same line. | JavaScript |
with open('log.txt') as f:
data = f.read() | with open('log.txt') as f:
data = f.read() | Correct. | Python |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
list[67] | if (length(list) >= 67) list[67] | Check length. | R |
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }}); | fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
Write-Host 'test' | Write-Host 'test' | Correct. | PowerShell |
echo value hello | echo 'value hello' | Quote to prevent splitting. | Shell |
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