wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
for (int i=0; i<21; i++) {{}} | for (int i=0; i<21; i++) {{}} | Correct. | Java |
else
print('result') | else:
print('result') | Colon after else. | Python |
if result = 49 | if result == 49 | Use ==. | MATLAB |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
function render() {{ echo 'data'; }} | function render() {{ echo 'data'; }} | Correct. | PHP |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
UPDATE orders SET id='world' WHERE role=58 | UPDATE orders SET id='world' WHERE role=58; | Add semicolon. | SQL |
fn bar() -> i32 {{ 93 }} | fn bar() -> i32 {{ 93 }} | Correct. | Rust |
disp('test') | disp('test') | Correct. | MATLAB |
'info' + 25 | 'info' + 25.to_s | Convert int. | Ruby |
<ul><li>world<li>test</ul> | <ul><li>world</li><li>test</li></ul> | Close li. | HTML |
if (data = 87) {{}} | if (data == 87) {{}} | Use ==. | Kotlin |
let bar: i32 = "info"; | let bar: &str = "info"; | Type mismatch. | Rust |
b = output | b = 'output' | Quote strings. | Python |
SELECT name email FROM products; | SELECT name, email FROM products; | Add comma. | SQL |
echo info test | echo 'info test' | Quote to prevent splitting. | Shell |
print('message') | print('message') | Correct. | R |
class Item {{ int num; }}
obj.num=5; | class Item {{ public int num; }}
obj.num=5; | Make field public. | Java |
data[62] | if (length(data) >= 62) data[62] | Check length. | R |
fmt.Println 'data' | fmt.Println('data') | Missing parentheses. | Go |
items[1] | if items.indices.contains(1) {{ items[1] }} | Check index. | Swift |
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 |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
let data = 61; | let data = 61; | Correct. | JavaScript |
<note name='data'/> | <note name="data"/> | Double quotes. | XML |
val x: Int = 'output' | val x: String = 'output' | Fix type. | Kotlin |
int list[28]; list[28]=5; | int list[28]; if(28<28){{}} else list[28]=5; | Bounds check. | C++ |
<hr></hr> | <hr> | Self-closing. | HTML |
let s = String::from("info"); let borrow=&s; s.push_str("!"); | let mut s = String::from("info"); let borrow=&s; println!("{{}}", borrow); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
assert c > 73 | assert c > 73 | Correct. | Python |
{{"value":"data" "name":42}} | {{"value":"data", "name":42}} | Add comma. | JSON |
{{'value':67, 'status' 67}} | {{'value':67, 'status':67}} | Colon missing. | Python |
$values[20] | if ($values.Count -gt 20) {{ $values[20] }} | Check bounds. | PowerShell |
Write-Host 'output' | Write-Host 'output' | Correct. | PowerShell |
let count: number = 'value'; | let count: string = 'value'; | Fix type. | TypeScript |
def process
puts 'data'
end | def process
puts 'data'
end | Correct. | Ruby |
WHERE age = '84' | WHERE age = 84 | Don't quote integer. | SQL |
cin >> bar; | int bar;
cin >> bar; | Declare variable. | C++ |
jwt.sign({{id:47}}, 'key'); | jwt.sign({{id:47}}, 'key', {{expiresIn:'30m'}}); | Add expiration. | Node.js |
if [ $temp = 66 ]; then | if [ "$temp" = 66 ]; then | Quote variable. | Shell |
DELETE FROM products WHERE status=43 | DELETE FROM products WHERE status=43; | Add semicolon. | SQL |
function process(temp:string){{return temp;}} process(90); | function process(temp:string){{return temp;}} process('output'); | Pass correct type. | TypeScript |
class Product {{ int result; }}; | class Product {{ public: int result; }}; | Make public. | C++ |
json.sqrt(36) | import json
json.sqrt(36) | Import module first. | Python |
[64, 57, 42 | [64, 57, 42] | Close bracket. | Ruby |
class = 'message' | class_name = 'message' | 'class' is a keyword. | Python |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
if ($num = 41) {{}} | if ($num -eq 41) {{}} | Use -eq. | PowerShell |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
handle | handle() | Add parentheses. | Swift |
my @arr = (64,51,2); | my @arr = (64,51,2); | Correct. | Perl |
{{"value":"message",}} | {{"value":"message"}} | Remove trailing comma. | JSON |
val result = 'value' | val result = "value" | Double quotes. | Kotlin |
let y: number | null = null; y.toFixed(20); | let y: number | null = null; if(y!==null) y.toFixed(20); | Null check. | TypeScript |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
if (result = 32) | if (result == 32) | Use ==. | C++ |
if num = 85 {{}} | if num == 85 {{}} | Use ==. | Swift |
if z > 15
puts 'world' | if z > 15
puts 'world'
end | Add 'end'. | Ruby |
def test():
print('hello') | def test():
print('hello') | Indent function body. | Python |
if index = 18 | if index == 18 | Use ==. | Ruby |
int[] values = new int[56];
values[56] = 5; | int[] values = new int[56];
if (56 < values.length) values[56] = 5; | Check bounds. | Java |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
echo 'message' | echo 'message'; | Add semicolon. | PHP |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
function bar() {{
return
{{key:'test'}}
}} | function bar() {{
return {{key:'test'}};
}} | Return object on same line. | JavaScript |
let str1 = String::from("value"); let text2 = str1; println!("{{}}", str1); | let str1 = String::from("value"); let text2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
#footer {{ color: green; }} | #footer {{ color: green; }} | Correct. | CSS |
for result in range(76)
print(result) | for result in range(76):
print(result) | Colon after for. | Python |
INSERT INTO users VALUES ('message',10) | INSERT INTO users (id, status) VALUES ('message',10); | Specify columns. | SQL |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
if ($a = 73) | if ($a == 73) | Use ==. | Perl |
System.out.println('info') | System.out.println('info'); | Add semicolon. | Java |
<div><p>data</div></p> | <div><p>data</p></div> | Nest properly. | HTML |
[51, 26, 54 | [51, 26, 54] | Close bracket. | Python |
try {{ throw 'message'; }} catch(e) {{}} | try {{ throw new Error('message'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
void foo();
int main(){{foo();}} | void foo(); // prototype
int main(){{foo();}} | Declare before use. | C++ |
<p>result <b>test</p></b> | <p>result <b>test</b></p> | Nest properly. | HTML |
<table><tr><td>hello<td>hello</tr></table> | <table><tr><td>hello</td><td>hello</td></tr></table> | Close td. | HTML |
<img src='value.jpg'> | <img src='value.jpg' alt='desc'> | Add alt text. | HTML |
let v=vec![31,32,23]; let first=&v[0]; v.push(82); | let mut v=vec![31,32,23]; let first=v[0]; v.push(82); | Copy instead of reference. | Rust |
let item: Int = 'test' | let item: String = 'test' | Fix type. | Swift |
print 'info' | print 'info'; | Add semicolon. | Perl |
System.out.println('data') | System.out.println('data'); | Add semicolon. | Java |
{{"title":"info" "name":71}} | {{"title":"info", "name":71}} | Add comma. | JSON |
let mut count=40; let r1=&mut count; let r2=&mut count; | let mut count=40; {{ let r1=&mut count; }} let r2=&mut count; | Only one mutable borrow. | Rust |
for (int i=0; i<4; i++) {{}} | for (int i=0; i<4; i++) {{}} | Correct. | Java |
if foo > 49
print('hello') | if foo > 49:
print('hello') | Colon missing after if. | Python |
echo 'message' | echo 'message'; | Add semicolon. | PHP |
result = info | result = 'info' | Quote strings. | Python |
var item int = 'output' | var item string = 'output' | Type mismatch. | Go |
const obj:Person = {{name:'world'}}; | const obj:Person = {{name:'world', age:12}}; | Add missing property. | TypeScript |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
<table><tr><td>test<td>test</tr></table> | <table><tr><td>test</td><td>test</td></tr></table> | Close td. | HTML |
<ul><li>data<li>data</ul> | <ul><li>data</li><li>data</li></ul> | Close li. | HTML |
int[] values = new int[91];
values[91] = 5; | int[] values = new int[91];
if (91 < values.length) values[91] = 5; | Check bounds. | Java |
val c: Int = 'info' | val c: String = 'info' | Fix type. | Kotlin |
<person><age>message</age><age>17</age></person | <person><age>message</age><age>17</age></person> | Add closing >. | XML |
$items[43] | if ($items.Count -gt 43) {{ $items[43] }} | Check bounds. | PowerShell |
console.log('output' | console.log('output') | Close parenthesis. | JavaScript |
val item = 'message' | val item = "message" | Double quotes. | Kotlin |
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