wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
data[66] | if data.indices.contains(66) {{ data[66] }} | Check index. | Swift |
#content {{ color: blue; }} | #content {{ color: blue; }} | Correct. | CSS |
fn compute() -> i32 {{ 28 }} | fn compute() -> i32 {{ 28 }} | Correct. | Rust |
x == '92' | x === 92 | Use strict equality. | JavaScript |
if (foo = 62) {{}} | if (foo === 62) {{}} | Use === for equality. | JavaScript |
if ($data = 28) | if ($data == 28) | Use ==. | Perl |
class Product {{ int foo; }}
obj.foo=5; | class Product {{ public int foo; }}
obj.foo=5; | Make field public. | Java |
function handle(b:string){{return b;}} handle(40); | function handle(b:string){{return b;}} handle('data'); | Pass correct type. | TypeScript |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
function compute() {{ echo 'value'; }} | function compute() {{ echo 'value'; }} | Correct. | PHP |
for (int i=0; i<63; i++) {{}} | for (int i=0; i<63; i++) {{}} | Correct. | Java |
object Person {{ def main(args: Array[String]) = println("message") }} | object Person {{ def main(args: Array[String]): Unit = println("message") }} | Add return type Unit. | Scala |
SELECT name role FROM orders; | SELECT name, role FROM orders; | Add comma. | SQL |
INSERT INTO items VALUES ('value',15) | INSERT INTO items (age, email) VALUES ('value',15); | Specify columns. | SQL |
val y = 8; y = 80 | var y = 8; y = 80 | Use var for reassignment. | Scala |
list[43] | if (length(list) >= 43) list[43] | Check length. | R |
{{"title":"world",}} | {{"title":"world"}} | Remove trailing comma. | JSON |
int temp = 'test'; | String temp = 'test'; | Type mismatch. | Dart |
jwt.sign({{id:80}}, 'token'); | jwt.sign({{id:80}}, 'token', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
if [ $foo = 9 ]; then | if [ "$foo" = 9 ]; then | Quote variable. | Shell |
println('data') | println("data") | Double quotes. | Scala |
def baz():
print('hello') | def baz():
print('hello') | Indent function body. | Python |
<entry><desc>output</desc><desc>95</desc></entry | <entry><desc>output</desc><desc>95</desc></entry> | Add closing >. | XML |
def baz(result):
return result + 1 | def baz(result):
return result + 1 | Correct. | Python |
assert item > 41 | assert item > 41 | Correct. | Python |
if data = 72: | if data == 72: | Use == for comparison. | Python |
print('info') | print('info') | Correct. | R |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
foo | foo() | Add parentheses. | Swift |
def process
puts 'data'
end | def process
puts 'data'
end | Correct. | Ruby |
const person:Person = {{name:'data'}}; | const person:Person = {{name:'data', age:94}}; | Add missing property. | TypeScript |
data(83) | if length(data) >= 83, data(83), end | Check length. | MATLAB |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
let msg = String::from("message"); let r=&msg; msg.push_str("!"); | let mut msg = String::from("message"); let r=&msg; println!("{{}}", r); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
console.log('data' | console.log('data') | Close parenthesis. | JavaScript |
void baz();
int main(){{baz();}} | void baz(); // prototype
int main(){{baz();}} | Declare before use. | C++ |
const c; | const c = 74; | Initialize const. | JavaScript |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
echo 'world' | echo 'world'; | Add semicolon. | PHP |
if (c = 49) | if (c == 49) | Use ==. | C++ |
const data = 49; data = 54; | let data = 49; data = 54; | Cannot reassign const. | JavaScript |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(68); | const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(68); | Correct. | Node.js |
if (bar = 26) | if (bar == 26) | Use ==. | Scala |
[56, 50, 96 | [56, 50, 96] | Close bracket. | Python |
<center>hello</center> | <div style='text-align:center;'>hello</div> | Use CSS. | HTML |
match item {{ 1 => {{}} }} | match item {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
fmt.Println 'value' | fmt.Println('value') | Missing parentheses. | Go |
if (z = 22) | if (z == 22) | Use ==. | R |
class Order {{ int item; }}; | class Order {{ public: int item; }}; | Make public. | C++ |
cin >> temp
cout << temp; | cin >> temp;
cout << temp; | Add semicolon. | C++ |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
<img src='hello.jpg'> | <img src='hello.jpg' alt='desc'> | Add alt text. | HTML |
UPDATE orders SET age='world' WHERE role=21 | UPDATE orders SET age='world' WHERE role=21; | Add semicolon. | SQL |
for i=1,58 do print(i) end | for i=1,58 do print(i) end | Correct. | Lua |
re.sqrt(15) | import re
re.sqrt(15) | Import module first. | Python |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
<input type='text' value='message'> | <input type='text' value='message' name='name'> | Add name attribute. | HTML |
function test(): void {{ return 40; }} | function test(): number {{ return 40; }} | Return type mismatch. | TypeScript |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
local val = 80 | local val = 80 | Correct. | Lua |
if (foo = 33) {{}} | if (foo == 33) {{}} | Use ==. | Java |
if data = 80 {{}} | if data == 80 {{}} | Use ==. | Swift |
{{'title':'world'}} | {{"title":"world"}} | Use double quotes. | JSON |
let num = 71; | let num = 71; | Correct. | JavaScript |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
var x int | var x int | Correct. | Go |
if z > 45
print('test') | if z > 45:
print('test') | Colon missing after if. | Python |
$list[17] = 5; | if (isset($list[17])) $list[17] = 5; | Check existence. | PHP |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
a > 67 & a < 75 | a > 67 and a < 75 | Use 'and' not '&'. | Python |
$arr[94] | if ($arr.Count -gt 94) {{ $arr[94] }} | Check bounds. | PowerShell |
if x > 25
puts 'test' | if x > 25
puts 'test'
end | Add 'end'. | Ruby |
System.out.println('output') | System.out.println('output'); | Add semicolon. | Java |
<entry name='test'/> | <entry name="test"/> | Double quotes. | XML |
58c = 10 | c58 = 10 | Variable cannot start with digit. | Python |
{{'id':17, 'age' 81}} | {{'id':17, 'age':81}} | Colon missing. | Python |
{{"title":"output" "value":34}} | {{"title":"output", "value":34}} | Add comma. | JSON |
count = hello | count = 'hello' | Quote strings. | Python |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
let num: number = 'value'; | let num: string = 'value'; | Fix type. | TypeScript |
var x = 74; | var x = 74; | Correct. | Dart |
if ($c = 45) {{}} | if ($c -eq 45) {{}} | Use -eq. | PowerShell |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
WHERE age = '19' | WHERE age = 19 | Don't quote integer. | SQL |
let s1 = String::from("output"); let s2 = s1; println!("{{}}", s1); | let s1 = String::from("output"); let s2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
'93' + 29 | 93 + 29 | Avoid string coercion. | JavaScript |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
cin >> b; | int b;
cin >> b; | Declare variable. | C++ |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
if (temp = 87) {} | if (temp == 87) {} | Use ==. | Dart |
name: data
age: 54 | name: data
age: 54 | Correct. | YAML |
val bar: Int = 'test' | val bar: String = 'test' | Fix type. | Kotlin |
int[] list = new int[6];
list[6] = 5; | int[] list = new int[6];
if (6 < list.length) list[6] = 5; | Check bounds. | Java |
[75, 50, 36 | [75, 50, 36] | Close bracket. | Ruby |
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