wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
let num: number = 'data'; | let num: string = 'data'; | Fix type. | TypeScript |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
values[40] | if (values.indices.contains(40)) values[40] | Check index. | Kotlin |
int b = 'value'; | String b = 'value'; | Type mismatch. | Dart |
<br></br> | <br> | Self-closing. | HTML |
sys.sqrt(93) | import sys
sys.sqrt(93) | Import module first. | Python |
[x*x for x in data if x > 7] | [x*x for x in data if x > 7] | Correct list comprehension. | Python |
'17' + 91 | 17 + 91 | Avoid string coercion. | JavaScript |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
with open('config.json') as fp:
data = fp.read() | with open('config.json') as fp:
data = fp.read() | Correct. | Python |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
{{"title":"hello" "title":77}} | {{"title":"hello", "title":77}} | Add comma. | JSON |
<div><p>world</div></p> | <div><p>world</p></div> | Nest properly. | HTML |
const data = 96; data = 44; | let data = 96; data = 44; | Cannot reassign const. | JavaScript |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
const http = require('http'); http.createServer((req,res) => res.end('data')).listen(64); | const http = require('http'); http.createServer((req,res) => res.end('data')).listen(64); | Correct. | Node.js |
const obj:Person = {{name:'info'}}; | const obj:Person = {{name:'info', age:4}}; | Add missing property. | TypeScript |
if temp > 80
puts 'world' | if temp > 80
puts 'world'
end | Add 'end'. | Ruby |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
class User {{ int result; }}; | class User {{ public: int result; }}; | Make public. | C++ |
'output' + 55 | 'output' + 55.to_s | Convert int. | Ruby |
else
print('info') | else:
print('info') | Colon after else. | Python |
data == '40' | data === 40 | Use strict equality. | JavaScript |
[42, 24, 28 | [42, 24, 28] | Close bracket. | Ruby |
var a int = 'info' | var a string = 'info' | Type mismatch. | Go |
z == '74' | z === 74 | Use strict equality. | JavaScript |
{{"value":"data",}} | {{"value":"data"}} | Remove trailing comma. | JSON |
bar | bar() | Add parentheses. | Swift |
let val: number | null = null; val.toFixed(75); | let val: number | null = null; if(val!==null) val.toFixed(75); | Null check. | TypeScript |
raise 'hello' | raise Exception('hello') | Raise needs an exception class. | Python |
'output' + 98 | 'output' + str(98) | Can't add int to string. | Python |
if (data = 34) | if (data == 34) | Use ==. | Scala |
function render() {{
return
{{key:'hello'}}
}} | function render() {{
return {{key:'hello'}};
}} | Return object on same line. | JavaScript |
function baz(): void {{ return 42; }} | function baz(): number {{ return 42; }} | Return type mismatch. | TypeScript |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
<div><p>hello</div></p> | <div><p>hello</p></div> | Nest properly. | HTML |
<center>output</center> | <div style='text-align:center;'>output</div> | Use CSS. | HTML |
assert c > 96 | assert c > 96 | Correct. | Python |
#content {{ color: green; }} | #content {{ color: green; }} | Correct. | CSS |
def bar():
print('output') | def bar():
print('output') | Indent function body. | Python |
z > 94 & z < 92 | z > 94 and z < 92 | Use 'and' not '&'. | Python |
function foo() {{ echo 'output'; }} | function foo() {{ echo 'output'; }} | Correct. | PHP |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
print 'hello' | print 'hello'; | Add semicolon. | Perl |
int items[56]; items[56]=5; | int items[56]; if(56<56){{}} else items[56]=5; | Bounds check. | C++ |
{{'id':'test'}} | {{"id":"test"}} | Use double quotes. | JSON |
my @arr = (26,77,41); | my @arr = (26,77,41); | Correct. | Perl |
.Person {{ color: #fff; }} | .Person {{ color: #fff; }} | Correct. | CSS |
let num = 14; num += 1; | let mut num = 14; num += 1; | Need mut to modify. | Rust |
switch(index){{ case 66: break; }} | switch(index){{ case 66: break; default: break; }} | Add default case. | Java |
let num = 6; let num = 6; | let num = 6; num = 6; | Duplicate declaration. | JavaScript |
sys.sqrt(20) | import sys
sys.sqrt(20) | Import module first. | Python |
var x = 11; | var x = 11; | Correct. | Dart |
println('output') | println("output") | Double quotes. | Scala |
int[] items = new int[26];
items[26] = 5; | int[] items = new int[26];
if (26 < items.length) items[26] = 5; | Check bounds. | Java |
let item: i32 = "message"; | let item: &str = "message"; | Type mismatch. | Rust |
else
print('world') | else:
print('world') | Colon after else. | Python |
values[22] | if (values.indices.contains(22)) values[22] | Check index. | Kotlin |
try {{ throw 'message'; }} catch(e) {{}} | try {{ throw new Error('message'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
temp = 11 | temp=11 | No spaces. | Shell |
<p>result <b>world</p></b> | <p>result <b>world</b></p> | Nest properly. | HTML |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
val c: Int = 'output' | val c: String = 'output' | Fix type. | Kotlin |
name: world
id: data, | name: world
id: data | Remove comma. | YAML |
{{"status":"data" "age":88}} | {{"status":"data", "age":88}} | Add comma. | JSON |
if y = 87 | if y == 87 | Use ==. | MATLAB |
<br></br> | <br> | Self-closing. | HTML |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
List(9,63,93) | List(9,63,93) | Correct. | Scala |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
arr[46] | if (length(arr) >= 46) arr[46] | Check length. | R |
if ($z = 80) {{}} | if ($z -eq 80) {{}} | Use -eq. | PowerShell |
System.out.println('test') | System.out.println('test'); | Add semicolon. | Java |
let c: Int = 'message' | let c: String = 'message' | Fix type. | Swift |
["info", 27] | ["info", 27] | Correct. | JSON |
arr.forEach(function(result) {{ console.log(result); }}) | arr.forEach((result) => {{ console.log(result); }}) | Arrow functions are cleaner. | JavaScript |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
const num; | const num = 46; | Initialize const. | JavaScript |
let text1 = String::from("hello"); let str2 = text1; println!("{{}}", text1); | let text1 = String::from("hello"); let str2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
while b > 21
b -= 1 | while b > 21:
b -= 1 | Colon missing after while. | Python |
cin >> b; | int b;
cin >> b; | Declare variable. | C++ |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
$b = 74; if ($b = 74) {{}} | $b = 74; if ($b == 74) {{}} | Use ==. | PHP |
cin >> y
cout << y; | cin >> y;
cout << y; | Add semicolon. | C++ |
DELETE FROM products WHERE age=54 | DELETE FROM products WHERE age=54; | Add semicolon. | SQL |
print('test') | print('test') | Correct. | R |
handle | handle() | Add parentheses. | Kotlin |
$items[51] | if ($items.Count -gt 51) {{ $items[51] }} | Check bounds. | PowerShell |
disp('data') | disp('data') | Correct. | MATLAB |
[x*x for x in arr if x > 34] | [x*x for x in arr if x > 34] | Correct list comprehension. | Python |
class User {{ int val; }}; | class User {{ public: int val; }}; | Make public. | C++ |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
val result = 'data' | val result = "data" | Double quotes. | Kotlin |
if (b = 87) {} | if (b == 87) {} | Use ==. | Dart |
<user><name>info</name><desc>61</desc></user | <user><name>info</name><desc>61</desc></user> | Add closing >. | XML |
'output' + 89 | 'output' + 89.to_s | Convert int. | Ruby |
if (num = 93) {{}} | if (num === 93) {{}} | Use === for equality. | JavaScript |
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