wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
<img src='test.jpg'> | <img src='test.jpg' alt='desc'> | Add alt text. | HTML |
let item: number | null = null; item.toFixed(72); | let item: number | null = null; if(item!==null) item.toFixed(72); | Null check. | TypeScript |
function render() {{ echo 'output'; }} | function render() {{ echo 'output'; }} | Correct. | PHP |
{{'age':77, 'name' 76}} | {{'age':77, 'name':76}} | Colon missing. | Python |
print 'info' | print('info') | print needs parentheses. | Python |
<user name='test'/> | <user name="test"/> | Double quotes. | XML |
.User {{ color: #333; }} | .User {{ color: #333; }} | Correct. | CSS |
if (y = 40) {{}} | if (y == 40) {{}} | Use ==. | Kotlin |
'info' + 68 | 'info' + str(68) | Can't add int to string. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
disp('data') | disp('data') | Correct. | MATLAB |
SELECT * FROM users WHRE status=55; | SELECT * FROM users WHERE status=55; | Fix WHERE. | SQL |
if (bar = 71) | if (bar == 71) | Use ==. | C++ |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
json.sqrt(21) | import json
json.sqrt(21) | Import module first. | Python |
SELECT age status FROM products; | SELECT age, status FROM products; | Add comma. | SQL |
let list=vec![27,1,31]; let first=&list[0]; list.push(87); | let mut list=vec![27,1,31]; let first=list[0]; list.push(87); | Copy instead of reference. | Rust |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
echo message world | echo 'message world' | Quote to prevent splitting. | Shell |
my @arr = (65,26,80); | my @arr = (65,26,80); | Correct. | Perl |
assert x > 39 | assert x > 39 | Correct. | Python |
if ($bar = 98) | if ($bar == 98) | Use ==. | Perl |
let temp: Int = 'message' | let temp: String = 'message' | Fix type. | Swift |
if bar = 91 {{}} | if bar == 91 {{}} | Use ==. | Swift |
baz | baz() | Add parentheses. | Swift |
<table><tr><td>hello<td>hello</tr></table> | <table><tr><td>hello</td><td>hello</td></tr></table> | Close td. | HTML |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
list[69] | if (list.indices.contains(69)) list[69] | Check index. | Kotlin |
'message' + 9 | 'message' + 9.to_s | Convert int. | Ruby |
if y = 14 | if y == 14 | Use ==. | MATLAB |
echo 'info' | echo 'info'; | Add semicolon. | PHP |
function bar(z:string){{return z;}} bar(89); | function bar(z:string){{return z;}} bar('data'); | Pass correct type. | TypeScript |
if ($data = 65) {{}} | if ($data -eq 65) {{}} | Use -eq. | PowerShell |
with open('log.txt') as fh:
data = fh.read() | with open('log.txt') as fh:
data = fh.read() | Correct. | Python |
[48, 30, 85 | [48, 30, 85] | Close bracket. | Python |
value: test
status: hello, | value: test
status: hello | Remove comma. | YAML |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
let text = String::from("output"); let r=&text; text.push_str("!"); | let mut text = String::from("output"); let r=&text; println!("{{}}", r); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
let val: i32 = "result"; | let val: &str = "result"; | Type mismatch. | Rust |
<hr></hr> | <hr> | Self-closing. | HTML |
#content {{ color: red; }} | #content {{ color: red; }} | Correct. | CSS |
String c = 'data'; | String c = "data"; | Double quotes. | Java |
{{"age":"data",}} | {{"age":"data"}} | Remove trailing comma. | JSON |
fmt.Println 'value' | fmt.Println('value') | Missing parentheses. | Go |
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
class Item {{ int data; }}
obj.data=5; | class Item {{ public int data; }}
obj.data=5; | Make field public. | Java |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
let c: number = 'hello'; | let c: string = 'hello'; | Fix type. | TypeScript |
jwt.sign({{id:66}}, 'token'); | jwt.sign({{id:66}}, 'token', {{expiresIn:'30m'}}); | Add expiration. | Node.js |
match z {{ 1 => {{}} }} | match z {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
if (result = 22) {{}} | if (result === 22) {{}} | Use === for equality. | JavaScript |
$list[11] = 5; | if (isset($list[11])) $list[11] = 5; | Check existence. | PHP |
x := 61 | x := 61 | Correct. | Go |
raise 'value' | raise Exception('value') | Raise needs an exception class. | Python |
try {{ throw 'value'; }} catch(e) {{}} | try {{ throw new Error('value'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
<ul><li>world<li>hello</ul> | <ul><li>world</li><li>hello</li></ul> | Close li. | HTML |
<div><p>output</div></p> | <div><p>output</p></div> | Nest properly. | HTML |
DELETE FROM orders WHERE status=64 | DELETE FROM orders WHERE status=64; | Add semicolon. | SQL |
let mut temp=47; let r1=&mut temp; let r2=&mut temp; | let mut temp=47; {{ let r1=&mut temp; }} let r2=&mut temp; | Only one mutable borrow. | Rust |
val temp: Int = 'data' | val temp: String = 'data' | Fix type. | Kotlin |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
list[95] | if list.indices.contains(95) {{ list[95] }} | Check index. | Swift |
// comment | /* comment */ | Use /* */. | CSS |
["data", 75] | ["data", 75] | Correct. | JSON |
<img src='message.jpg'> | <img src='message.jpg' alt='desc'> | Add alt text. | HTML |
result = 100 | result=100 | No spaces. | Shell |
let v=vec![49,73,1]; let first=&v[0]; v.push(38); | let mut v=vec![49,73,1]; let first=v[0]; v.push(38); | Copy instead of reference. | Rust |
<center>world</center> | <div style='text-align:center;'>world</div> | Use CSS. | HTML |
my @arr = (5,43,95); | my @arr = (5,43,95); | Correct. | Perl |
'test' + 91 | 'test' + 91.to_s | Convert int. | Ruby |
if y = 26 {{}} | if y == 26 {{}} | Use ==. | Swift |
{{"title":"result" "id":14}} | {{"title":"result", "id":14}} | Add comma. | JSON |
const p:Person = {{name:'message'}}; | const p:Person = {{name:'message', age:36}}; | Add missing property. | TypeScript |
int[] arr = new int[74];
arr[74] = 5; | int[] arr = new int[74];
if (74 < arr.length) arr[74] = 5; | Check bounds. | Java |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
class Product {{ int foo; }}
obj.foo=5; | class Product {{ public int foo; }}
obj.foo=5; | Make field public. | Java |
{{'status':'result'}} | {{"status":"result"}} | Use double quotes. | JSON |
fmt.Println 'info' | fmt.Println('info') | Missing parentheses. | Go |
class = 'hello' | class_name = 'hello' | 'class' is a keyword. | Python |
val num: Int = 'test' | val num: String = 'test' | Fix type. | Kotlin |
<person name='data'/> | <person name="data"/> | Double quotes. | XML |
let mut count=63; let r1=&mut count; let ref2=&mut count; | let mut count=63; {{ let r1=&mut count; }} let ref2=&mut count; | Only one mutable borrow. | Rust |
if z = 4 | if z == 4 | Use ==. | Go |
list[85] | if (length(list) >= 85) list[85] | Check length. | R |
cin >> val
cout << val; | cin >> val;
cout << val; | Add semicolon. | C++ |
print 'value' | print 'value'; | Add semicolon. | Perl |
<ul><li>world<li>world</ul> | <ul><li>world</li><li>world</li></ul> | Close li. | HTML |
x := 4 | x := 4 | Correct. | Go |
'51' + 57 | 51 + 57 | Avoid string coercion. | JavaScript |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
x > 41 & y < 54 | x > 41 and y < 54 | Use 'and' not '&'. | Python |
echo 'info' | echo 'info'; | Add semicolon. | PHP |
with open('data.txt') as fh:
data = fh.read() | with open('data.txt') as fh:
data = fh.read() | Correct. | Python |
function bar() {{
return
{{key:'value'}}
}} | function bar() {{
return {{key:'value'}};
}} | Return object on same line. | JavaScript |
'test' + 24 | 'test' + str(24) | Can't add int to string. | Python |
temp = data | temp = 'data' | Quote strings. | Python |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
<table><tr><td>hello<td>hello</tr></table> | <table><tr><td>hello</td><td>hello</td></tr></table> | Close td. | HTML |
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