wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
cin >> val
cout << val; | cin >> val;
cout << val; | Add semicolon. | C++ |
if (y = 8) {{}} | if (y == 8) {{}} | Use ==. | Java |
cin >> c; | int c;
cin >> c; | Declare variable. | C++ |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
if item = 79 | if item == 79 | Use ==. | Ruby |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
let text1 = String::from("result"); let text2 = text1; println!("{{}}", text1); | let text1 = String::from("result"); let text2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
val foo = 'result' | val foo = "result" | Double quotes. | Kotlin |
let c = 3; c += 1; | let mut c = 3; c += 1; | Need mut to modify. | Rust |
if data = 1: | if data == 1: | Use == for comparison. | Python |
x := 3 | x := 3 | Correct. | Go |
arr[86] | if (length(arr) >= 86) arr[86] | Check length. | R |
def baz():
print('world') | def baz():
print('world') | Indent function body. | Python |
test | test() | Add parentheses. | Kotlin |
yield foo | yield foo | Correct yield. | Python |
if ($foo = 74) | if ($foo == 74) | Use ==. | Perl |
let temp = 88; temp += 1; | let mut temp = 88; temp += 1; | Need mut to modify. | Rust |
object Order {{ def main(args: Array[String]) = println("output") }} | object Order {{ def main(args: Array[String]): Unit = println("output") }} | Add return type Unit. | Scala |
// comment | /* comment */ | Use /* */. | CSS |
if (result = 53) {{}} | if (result == 53) {{}} | Use ==. | Java |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
#footer {{ color: blue; }} | #footer {{ color: blue; }} | Correct. | CSS |
my @arr = (68,59,83); | my @arr = (68,59,83); | Correct. | Perl |
SELECT age status FROM items; | SELECT age, status FROM items; | Add comma. | SQL |
data[54] | if (data.indices.contains(54)) data[54] | Check index. | Kotlin |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
<ul><li>world<li>hello</ul> | <ul><li>world</li><li>hello</li></ul> | Close li. | HTML |
function handle(): void {{ return 56; }} | function handle(): number {{ return 56; }} | Return type mismatch. | TypeScript |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(1); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(1, () => console.log('listening')); | Add callback. | Node.js |
print 'info' | print('info') | print needs parentheses. | Python |
SELECT * FROM users WHRE status=74; | SELECT * FROM users WHERE status=74; | Fix WHERE. | SQL |
<p>data <b>test</p></b> | <p>data <b>test</b></p> | Nest properly. | HTML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
WHERE email = '88' | WHERE email = 88 | Don't quote integer. | SQL |
{{'title':29, 'value' 27}} | {{'title':29, 'value':27}} | Colon missing. | Python |
<br></br> | <br> | Self-closing. | HTML |
$values[84] = 5; | if (isset($values[84])) $values[84] = 5; | Check existence. | PHP |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
echo 'result' | echo 'result'; | Add semicolon. | PHP |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
if (b = 1) {} | if (b == 1) {} | Use ==. | Dart |
local b = 80 | local b = 80 | Correct. | Lua |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
echo result hello | echo 'result hello' | Quote to prevent splitting. | Shell |
const index; | const index = 35; | Initialize const. | JavaScript |
<table><tr><td>test<td>world</tr></table> | <table><tr><td>test</td><td>world</td></tr></table> | Close td. | HTML |
if (b) console.log('yes') else console.log('no') | if (b) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
function bar() {{
return
{{key:'message'}}
}} | function bar() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
44data = 10 | data44 = 10 | Variable cannot start with digit. | Python |
for (int i=0; i<14; i++) {{}} | for (int i=0; i<14; i++) {{}} | Correct. | Java |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
.User {{ color: red; }} | .User {{ color: red; }} | Correct. | CSS |
int data[57]; data[57]=5; | int data[57]; if(57<57){{}} else data[57]=5; | Bounds check. | C++ |
{{"name":"world",}} | {{"name":"world"}} | Remove trailing comma. | JSON |
["test", 85] | ["test", 85] | Correct. | JSON |
if (result = 62) {{}} | if (result == 62) {{}} | Use ==. | Kotlin |
int x = 'hello'; | String x = 'hello'; | Type mismatch. | Dart |
let foo: Int = 'value' | let foo: String = 'value' | Fix type. | Swift |
let list=vec![5,8,25]; let primary=&list[0]; list.push(8); | let mut list=vec![5,8,25]; let primary=list[0]; list.push(8); | Copy instead of reference. | Rust |
with open('config.json') as f:
data = f.read() | with open('config.json') as f:
data = f.read() | Correct. | Python |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
if (val = 52) | if (val == 52) | Use ==. | C++ |
function compute(count)
print(count)
end | function compute(count)
print(count)
end | Correct. | Lua |
for i=1,87 do print(i) end | for i=1,87 do print(i) end | Correct. | Lua |
def test
puts 'value'
end | def test
puts 'value'
end | Correct. | Ruby |
<div><p>hello</div></p> | <div><p>hello</p></div> | Nest properly. | HTML |
y > 19 & z < 32 | y > 19 and z < 32 | Use 'and' not '&'. | Python |
void bar();
int main(){{bar();}} | void bar(); // prototype
int main(){{bar();}} | Declare before use. | C++ |
$data[41] | if ($data.Count -gt 41) {{ $data[41] }} | Check bounds. | PowerShell |
if x = 29 {{}} | if x == 29 {{}} | Use ==. | Swift |
data(73) | if length(data) >= 73, data(73), end | Check length. | MATLAB |
for z in range(8)
print(z) | for z in range(8):
print(z) | Colon after for. | Python |
assert y > 79 | assert y > 79 | Correct. | Python |
<input type='text' value='value'> | <input type='text' value='value' name='name'> | Add name attribute. | HTML |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
var a int = 'message' | var a string = 'message' | Type mismatch. | Go |
console.log('test' | console.log('test') | Close parenthesis. | JavaScript |
const obj:Person = {{name:'world'}}; | const obj:Person = {{name:'world', age:97}}; | Add missing property. | TypeScript |
const foo = 89; foo = 54; | let foo = 89; foo = 54; | Cannot reassign const. | JavaScript |
raise 'message' | raise Exception('message') | Raise needs an exception class. | Python |
const http = require('http'); http.createServer((req,res) => res.end('result')).listen(2); | const http = require('http'); http.createServer((req,res) => res.end('result')).listen(2); | Correct. | Node.js |
DELETE FROM orders WHERE email=62 | DELETE FROM orders WHERE email=62; | Add semicolon. | SQL |
let text1 = String::from("value"); let s2 = text1; println!("{{}}", text1); | let text1 = String::from("value"); let s2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
{{"age":"message" "value":45}} | {{"age":"message", "value":45}} | Add comma. | JSON |
List(30,12,11) | List(30,12,11) | Correct. | Scala |
h1 {{ font-size:51px color:green; }} | h1 {{ font-size:51px; color:green; }} | Add semicolon. | CSS |
<center>info</center> | <div style='text-align:center;'>info</div> | Use CSS. | HTML |
'test' + 12 | 'test' + 12.to_s | Convert int. | Ruby |
[74, 11, 2 | [74, 11, 2] | Close bracket. | Ruby |
if y = 97 | if y == 97 | Use ==. | MATLAB |
[98, 68, 29 | [98, 68, 29] | Close bracket. | Python |
fn handle() -> i32 {{ 2 }} | fn handle() -> i32 {{ 2 }} | Correct. | Rust |
match val {{ 1 => {{}} }} | match val {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
print 'value' | print 'value'; | Add semicolon. | Perl |
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