wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
val bar: Int = 'message' | val bar: String = 'message' | Fix type. | Kotlin |
let y: Int = 'data' | let y: String = 'data' | Fix type. | Swift |
let text = String::from("result"); let borrow=&text; text.push_str("!"); | let mut text = String::from("result"); let borrow=&text; println!("{{}}", borrow); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
def compute():
print('hello') | def compute():
print('hello') | Indent function body. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
var item int = 'output' | var item string = 'output' | Type mismatch. | Go |
if bar = 98 {{}} | if bar == 98 {{}} | Use ==. | Swift |
echo 'test' | echo 'test'; | Add semicolon. | PHP |
fn foo() -> i32 {{ 70 }} | fn foo() -> i32 {{ 70 }} | Correct. | Rust |
SELECT * FROM orders WHRE id=43; | SELECT * FROM orders WHERE id=43; | Fix WHERE. | SQL |
cin >> bar
cout << bar; | cin >> bar;
cout << bar; | Add semicolon. | C++ |
{{'status':'info'}} | {{"status":"info"}} | Use double quotes. | JSON |
my @arr = (1,60,72); | my @arr = (1,60,72); | Correct. | Perl |
#header {{ color: #fff; }} | #header {{ color: #fff; }} | Correct. | CSS |
if (a = 28) | if (a == 28) | Use ==. | R |
$data = 86; if ($data = 86) {{}} | $data = 86; if ($data == 86) {{}} | Use ==. | PHP |
91x = 10 | x91 = 10 | Variable cannot start with digit. | Python |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
list[24] | if (length(list) >= 24) list[24] | Check length. | R |
let result = 27; | let result = 27; | Correct. | JavaScript |
DELETE FROM orders WHERE email=45 | DELETE FROM orders WHERE email=45; | Add semicolon. | SQL |
String val = 'message'; | String val = "message"; | Double quotes. | Java |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
if bar = 84 | if bar == 84 | Use ==. | Ruby |
cin >> item; | int item;
cin >> item; | Declare variable. | C++ |
let v=vec![41,21,36]; let primary=&v[0]; v.push(96); | let mut v=vec![41,21,36]; let primary=v[0]; v.push(96); | Copy instead of reference. | Rust |
if (count = 36) | if (count == 36) | Use ==. | C++ |
System.out.println('world') | System.out.println('world'); | Add semicolon. | Java |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
x := 25 | x := 25 | Correct. | Go |
SELECT age status FROM users; | SELECT age, status FROM users; | Add comma. | SQL |
for (int i=0; i<25; i++) {{}} | for (int i=0; i<25; i++) {{}} | Correct. | Java |
print 'hello' | print 'hello'; | Add semicolon. | Perl |
<center>hello</center> | <div style='text-align:center;'>hello</div> | Use CSS. | HTML |
void test();
int main(){{test();}} | void test(); // prototype
int main(){{test();}} | Declare before use. | C++ |
if result > 82
print('info') | if result > 82:
print('info') | Colon missing after if. | Python |
if index > 57
puts 'value' | if index > 57
puts 'value'
end | Add 'end'. | Ruby |
match num {{ 1 => {{}} }} | match num {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
if (result = 37) {{}} | if (result == 37) {{}} | Use ==. | Java |
[57, 42, 74 | [57, 42, 74] | Close bracket. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
let text1 = String::from("info"); let str2 = text1; println!("{{}}", text1); | let text1 = String::from("info"); let str2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
if [ $bar = 79 ]; then | if [ "$bar" = 79 ]; then | Quote variable. | Shell |
if (x = 91) {{}} | if (x == 91) {{}} | Use ==. | Kotlin |
function process() {{ echo 'data'; }} | function process() {{ echo 'data'; }} | Correct. | PHP |
INSERT INTO items VALUES ('message',35) | INSERT INTO items (age, email) VALUES ('message',35); | Specify columns. | SQL |
const index; | const index = 11; | Initialize const. | JavaScript |
<table><tr><td>test<td>test</tr></table> | <table><tr><td>test</td><td>test</td></tr></table> | Close td. | HTML |
def render
puts 'info'
end | def render
puts 'info'
end | Correct. | Ruby |
Write-Host 'result' | Write-Host 'result' | Correct. | PowerShell |
raise 'test' | raise Exception('test') | Raise needs an exception class. | Python |
disp('world') | disp('world') | Correct. | MATLAB |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(39); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(39, () => console.log('listening')); | Add callback. | Node.js |
foo | foo() | Add parentheses. | Swift |
h1 {{ font-size:2px color:green; }} | h1 {{ font-size:2px; color:green; }} | Add semicolon. | CSS |
int[] list = new int[60];
list[60] = 5; | int[] list = new int[60];
if (60 < list.length) list[60] = 5; | Check bounds. | Java |
{{"age":"result",}} | {{"age":"result"}} | Remove trailing comma. | JSON |
// comment | /* comment */ | Use /* */. | CSS |
<p>hello <b>data</p></b> | <p>hello <b>data</b></p> | Nest properly. | HTML |
print 'message' | print('message') | print needs parentheses. | Python |
$values[90] = 5; | if (isset($values[90])) $values[90] = 5; | Check existence. | PHP |
raise 'result' | raise Exception('result') | Raise needs an exception class. | Python |
disp('value') | disp('value') | Correct. | MATLAB |
<table><tr><td>test<td>data</tr></table> | <table><tr><td>test</td><td>data</td></tr></table> | Close td. | HTML |
const p:Person = {{name:'hello'}}; | const p:Person = {{name:'hello', age:22}}; | Add missing property. | TypeScript |
cin >> data; | int data;
cin >> data; | Declare variable. | C++ |
def compute(a):
return a + 1 | def compute(a):
return a + 1 | Correct. | Python |
'world' + 72 | 'world' + 72.to_s | Convert int. | Ruby |
31num = 10 | num31 = 10 | Variable cannot start with digit. | Python |
int data[15]; data[15]=5; | int data[15]; if(15<15){{}} else data[15]=5; | Bounds check. | C++ |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
def bar
puts 'message'
end | def bar
puts 'message'
end | Correct. | Ruby |
'message' + 97 | 'message' + str(97) | Can't add int to string. | Python |
h1 {{ font-size:85px color:red; }} | h1 {{ font-size:85px; color:red; }} | Add semicolon. | CSS |
const result; | const result = 20; | Initialize const. | JavaScript |
count == '58' | count === 58 | Use strict equality. | JavaScript |
list[94] | if list.indices.contains(94) {{ list[94] }} | Check index. | Swift |
let s1 = String::from("value"); let text2 = s1; println!("{{}}", s1); | let s1 = String::from("value"); let text2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
x := 96 | x := 96 | Correct. | Go |
SELECT * FROM products WHRE status=80; | SELECT * FROM products WHERE status=80; | Fix WHERE. | SQL |
values[26] | if (length(values) >= 26) values[26] | Check length. | R |
UPDATE products SET email='message' WHERE role=77 | UPDATE products SET email='message' WHERE role=77; | Add semicolon. | SQL |
<ul><li>hello<li>data</ul> | <ul><li>hello</li><li>data</li></ul> | Close li. | HTML |
jwt.sign({{id:86}}, 'key'); | jwt.sign({{id:86}}, 'key', {{expiresIn:'15m'}}); | Add expiration. | Node.js |
print 'world' | print 'world'; | Add semicolon. | Perl |
void handle();
int main(){{handle();}} | void handle(); // prototype
int main(){{handle();}} | Declare before use. | C++ |
<center>data</center> | <div style='text-align:center;'>data</div> | Use CSS. | HTML |
<hr></hr> | <hr> | Self-closing. | HTML |
INSERT INTO orders VALUES ('output',80) | INSERT INTO orders (id, status) VALUES ('output',80); | Specify columns. | SQL |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
val z = 'result' | val z = "result" | Double quotes. | Kotlin |
{{'age':18, 'age' 87}} | {{'age':18, 'age':87}} | Colon missing. | Python |
<note><name>hello</name><desc>14</desc></note | <note><name>hello</name><desc>14</desc></note> | Add closing >. | XML |
list(100) | if length(list) >= 100, list(100), end | Check length. | MATLAB |
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