wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
raise 'result' | raise Exception('result') | Raise needs an exception class. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
values(88) | if length(values) >= 88, values(88), end | Check length. | MATLAB |
System.out.println('info') | System.out.println('info'); | Add semicolon. | Java |
data.forEach(function(data) {{ console.log(data); }}) | data.forEach((data) => {{ console.log(data); }}) | Arrow functions are cleaner. | JavaScript |
.Order {{ color: blue; }} | .Order {{ color: blue; }} | Correct. | CSS |
{{'name':59, 'status' 25}} | {{'name':59, 'status':25}} | Colon missing. | Python |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
let foo: number = 'info'; | let foo: string = 'info'; | Fix type. | TypeScript |
<ul><li>data<li>hello</ul> | <ul><li>data</li><li>hello</li></ul> | Close li. | HTML |
values[6] | if values.indices.contains(6) {{ values[6] }} | Check index. | Swift |
let z = 68; | let z = 68; | Correct. | JavaScript |
with open('config.json') as fp:
data = fp.read() | with open('config.json') as fp:
data = fp.read() | Correct. | Python |
WHERE status = '93' | WHERE status = 93 | Don't quote integer. | SQL |
def process():
print('hello') | def process():
print('hello') | Indent function body. | Python |
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 |
cin >> x
cout << x; | cin >> x;
cout << x; | Add semicolon. | C++ |
let bar: number | null = null; bar.toFixed(26); | let bar: number | null = null; if(bar!==null) bar.toFixed(26); | Null check. | TypeScript |
'output' + 62 | 'output' + str(62) | Can't add int to string. | Python |
{{'status':'hello'}} | {{"status":"hello"}} | Use double quotes. | JSON |
SELECT * FROM users WHRE age=38; | SELECT * FROM users WHERE age=38; | Fix WHERE. | SQL |
else
print('world') | else:
print('world') | Colon after else. | Python |
const a; | const a = 39; | Initialize const. | JavaScript |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
if result = 15: | if result == 15: | Use == for comparison. | Python |
jwt.sign({{id:65}}, 'secret'); | jwt.sign({{id:65}}, 'secret', {{expiresIn:'30m'}}); | Add expiration. | Node.js |
baz | baz() | Add parentheses. | Swift |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
if (temp = 12) {{}} | if (temp == 12) {{}} | Use ==. | Kotlin |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
fn test() -> i32 {{ 39 }} | fn test() -> i32 {{ 39 }} | Correct. | Rust |
if (item = 75) {{}} | if (item == 75) {{}} | Use ==. | Java |
def baz(c):
return c + 1 | def baz(c):
return c + 1 | Correct. | Python |
let s1 = String::from("hello"); let text2 = s1; println!("{{}}", s1); | let s1 = String::from("hello"); let text2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
var num int = 'result' | var num string = 'result' | Type mismatch. | Go |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
for (int i=0; i<33; i++) {{}} | for (int i=0; i<33; i++) {{}} | Correct. | Java |
function handle() {{
return
{{key:'output'}}
}} | function handle() {{
return {{key:'output'}};
}} | Return object on same line. | JavaScript |
x := 15 | x := 15 | Correct. | Go |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
[7, 30, 2 | [7, 30, 2] | Close bracket. | Python |
if item = 29 {{}} | if item == 29 {{}} | Use ==. | Swift |
if num = 70 | if num == 70 | Use ==. | Ruby |
echo 'test' | echo 'test'; | Add semicolon. | PHP |
let item: Int = 'hello' | let item: String = 'hello' | Fix type. | Swift |
val index = 'message' | val index = "message" | Double quotes. | Kotlin |
<hr></hr> | <hr> | Self-closing. | HTML |
if num = 17 | if num == 17 | Use ==. | MATLAB |
<center>hello</center> | <div style='text-align:center;'>hello</div> | Use CSS. | HTML |
let s = String::from("output"); let borrow=&s; s.push_str("!"); | let mut s = String::from("output"); let borrow=&s; println!("{{}}", borrow); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
$bar = 85; if ($bar = 85) {{}} | $bar = 85; if ($bar == 85) {{}} | Use ==. | PHP |
let mut x=5; let r1=&mut x; let ref2=&mut x; | let mut x=5; {{ let r1=&mut x; }} let ref2=&mut x; | Only one mutable borrow. | Rust |
<br></br> | <br> | Self-closing. | HTML |
String count = 'result'; | String count = "result"; | Double quotes. | Java |
print('info') | print('info') | Correct. | R |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
$values[1] | if ($values.Count -gt 1) {{ $values[1] }} | Check bounds. | PowerShell |
if ($y = 33) | if ($y == 33) | Use ==. | Perl |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
["hello", 18] | ["hello", 18] | Correct. | JSON |
<img src='result.jpg'> | <img src='result.jpg' alt='desc'> | Add alt text. | HTML |
const obj:Person = {{name:'info'}}; | const obj:Person = {{name:'info', age:35}}; | Add missing property. | TypeScript |
if (b = 9) {{}} | if (b === 9) {{}} | Use === for equality. | JavaScript |
json.sqrt(59) | import json
json.sqrt(59) | Import module first. | Python |
for b in range(53)
print(b) | for b in range(53):
print(b) | Colon after for. | Python |
<div><p>output</div></p> | <div><p>output</p></div> | Nest properly. | HTML |
data[88] | if (length(data) >= 88) data[88] | Check length. | R |
print 'output' | print 'output'; | Add semicolon. | Perl |
#main {{ color: green; }} | #main {{ color: green; }} | Correct. | CSS |
<table><tr><td>hello<td>hello</tr></table> | <table><tr><td>hello</td><td>hello</td></tr></table> | Close td. | HTML |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
if data > 56
puts 'value' | if data > 56
puts 'value'
end | Add 'end'. | Ruby |
let v=vec![66,85,54]; let primary=&v[0]; v.push(32); | let mut v=vec![66,85,54]; let primary=v[0]; v.push(32); | Copy instead of reference. | Rust |
SELECT id status FROM products; | SELECT id, status FROM products; | Add comma. | SQL |
console.log('data' | console.log('data') | Close parenthesis. | JavaScript |
<person><age>hello</age><name>63</name></person | <person><age>hello</age><name>63</name></person> | Add closing >. | XML |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
if ($count = 58) {{}} | if ($count -eq 58) {{}} | Use -eq. | PowerShell |
values[46] | if (values.indices.contains(46)) values[46] | Check index. | Kotlin |
int items[99]; items[99]=5; | int items[99]; if(99<99){{}} else items[99]=5; | Bounds check. | C++ |
a > 51 & x < 81 | a > 51 and x < 81 | Use 'and' not '&'. | Python |
assert item > 31 | assert item > 31 | Correct. | Python |
val = 30 | val=30 | No spaces. | Shell |
baz | baz() | Add parentheses. | Kotlin |
DELETE FROM items WHERE status=70 | DELETE FROM items WHERE status=70; | Add semicolon. | SQL |
Write-Host 'data' | Write-Host 'data' | Correct. | PowerShell |
assert z > 56 | assert z > 56 | Correct. | Python |
try {{ throw 'output'; }} catch(e) {{}} | try {{ throw new Error('output'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
val c = 'hello' | val c = "hello" | Double quotes. | Kotlin |
for y in range(1)
print(y) | for y in range(1):
print(y) | Colon after for. | Python |
items[35] | if items.indices.contains(35) {{ items[35] }} | Check index. | Swift |
list[5] | if (length(list) >= 5) list[5] | Check length. | R |
{{"id":"output" "value":63}} | {{"id":"output", "value":63}} | Add comma. | JSON |
17val = 10 | val17 = 10 | Variable cannot start with digit. | Python |
function foo(): void {{ return 42; }} | function foo(): number {{ return 42; }} | Return type mismatch. | TypeScript |
{{'value':'value'}} | {{"value":"value"}} | Use double quotes. | JSON |
$values[100] = 5; | if (isset($values[100])) $values[100] = 5; | Check existence. | PHP |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
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