wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
<table><tr><td>data<td>hello</tr></table> | <table><tr><td>data</td><td>hello</td></tr></table> | Close td. | HTML |
try {{ throw 'output'; }} catch(e) {{}} | try {{ throw new Error('output'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
'test' + 78 | 'test' + str(78) | Can't add int to string. | Python |
for (int i=0; i<37; i++) {{}} | for (int i=0; i<37; i++) {{}} | Correct. | Java |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
console.log('world' | console.log('world') | Close parenthesis. | JavaScript |
val == '28' | val === 28 | Use strict equality. | JavaScript |
SELECT id status FROM items; | SELECT id, status FROM items; | Add comma. | SQL |
for (val in values) | for (val of values) | for...in iterates keys. | JavaScript |
'96' + 100 | 96 + 100 | Avoid string coercion. | JavaScript |
def baz(z):
return z + 1 | def baz(z):
return z + 1 | Correct. | Python |
<entry name='message'/> | <entry name="message"/> | Double quotes. | XML |
x := 14 | x := 14 | Correct. | Go |
function render() {{
return
{{key:'data'}}
}} | function render() {{
return {{key:'data'}};
}} | Return object on same line. | JavaScript |
int[] arr = new int[84];
arr[84] = 5; | int[] arr = new int[84];
if (84 < arr.length) arr[84] = 5; | Check bounds. | Java |
#content {{ color: #333; }} | #content {{ color: #333; }} | Correct. | CSS |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
if (index = 43) {{}} | if (index == 43) {{}} | Use ==. | Kotlin |
print 'world' | print 'world'; | Add semicolon. | Perl |
{{'age':'world'}} | {{"age":"world"}} | Use double quotes. | JSON |
match b {{ 1 => {{}} }} | match b {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
if bar > 99
print('output') | if bar > 99:
print('output') | Colon missing after if. | Python |
cin >> b
cout << b; | cin >> b;
cout << b; | Add semicolon. | C++ |
bar | bar() | Add parentheses. | Kotlin |
.Item {{ color: #fff; }} | .Item {{ color: #fff; }} | Correct. | CSS |
let x = 'output' | let x = "output" | Double quotes. | Swift |
if ($x = 38) {{}} | if ($x -eq 38) {{}} | Use -eq. | PowerShell |
if (z = 63) | if (z == 63) | Use ==. | R |
class Item {{ int y; }}
obj.y=5; | class Item {{ public int y; }}
obj.y=5; | Make field public. | Java |
const x; | const x = 8; | Initialize const. | JavaScript |
val count: Int = 'value' | val count: String = 'value' | Fix type. | Kotlin |
let s = String::from("value"); let borrow=&s; s.push_str("!"); | let mut s = String::from("value"); let borrow=&s; println!("{{}}", borrow); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
baz | baz() | Add parentheses. | Swift |
<div><p>value</div></p> | <div><p>value</p></div> | Nest properly. | HTML |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
<note><age>message</age><age>37</age></note | <note><age>message</age><age>37</age></note> | Add closing >. | XML |
echo world world | echo 'world world' | Quote to prevent splitting. | Shell |
<center>value</center> | <div style='text-align:center;'>value</div> | Use CSS. | HTML |
[49, 79, 17 | [49, 79, 17] | Close bracket. | Ruby |
def foo(index):
return index + 1 | def foo(index):
return index + 1 | Correct. | Python |
echo 'test' | echo 'test'; | Add semicolon. | PHP |
function baz() {{
return
{{key:'result'}}
}} | function baz() {{
return {{key:'result'}};
}} | Return object on same line. | JavaScript |
let num = 'data' | let num = "data" | Double quotes. | Swift |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
arr(38) | if length(arr) >= 38, arr(38), end | Check length. | MATLAB |
print 'hello' | print 'hello'; | Add semicolon. | Perl |
<person name='output'/> | <person name="output"/> | Double quotes. | XML |
WHERE age = '71' | WHERE age = 71 | Don't quote integer. | SQL |
if x = 94 | if x == 94 | Use ==. | Ruby |
class Person {{ int temp; }}; | class Person {{ public: int temp; }}; | Make public. | C++ |
h1 {{ font-size:8px color:green; }} | h1 {{ font-size:8px; color:green; }} | Add semicolon. | CSS |
<ul><li>hello<li>test</ul> | <ul><li>hello</li><li>test</li></ul> | Close li. | HTML |
class = 'info' | class_name = 'info' | 'class' is a keyword. | Python |
String count = 'hello'; | String count = "hello"; | Double quotes. | Java |
let c: number | null = null; c.toFixed(29); | let c: number | null = null; if(c!==null) c.toFixed(29); | Null check. | TypeScript |
values.forEach(function(y) {{ console.log(y); }}) | values.forEach((y) => {{ console.log(y); }}) | Arrow functions are cleaner. | JavaScript |
["value", 74] | ["value", 74] | Correct. | JSON |
Write-Host 'info' | Write-Host 'info' | Correct. | PowerShell |
console.log('info' | console.log('info') | Close parenthesis. | JavaScript |
$list[42] = 5; | if (isset($list[42])) $list[42] = 5; | Check existence. | PHP |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
num == '89' | num === 89 | Use strict equality. | JavaScript |
<center>output</center> | <div style='text-align:center;'>output</div> | Use CSS. | HTML |
jwt.sign({{id:4}}, 'key'); | jwt.sign({{id:4}}, 'key', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
x = 78 | x=78 | No spaces. | Shell |
items[97] | if (items.indices.contains(97)) items[97] | Check index. | Kotlin |
let v=vec![29,6,7]; let head=&v[0]; v.push(11); | let mut v=vec![29,6,7]; let head=v[0]; v.push(11); | Copy instead of reference. | Rust |
<div><p>hello</div></p> | <div><p>hello</p></div> | Nest properly. | HTML |
let text1 = String::from("test"); let str2 = text1; println!("{{}}", text1); | let text1 = String::from("test"); let str2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
'value' + 76 | 'value' + str(76) | Can't add int to string. | Python |
else
print('data') | else:
print('data') | Colon after else. | Python |
<hr></hr> | <hr> | Self-closing. | HTML |
if foo > 89
puts 'hello' | if foo > 89
puts 'hello'
end | Add 'end'. | Ruby |
{{'age':'result'}} | {{"age":"result"}} | Use double quotes. | JSON |
SELECT * FROM products WHRE id=98; | SELECT * FROM products WHERE id=98; | Fix WHERE. | SQL |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
const obj:Person = {{name:'test'}}; | const obj:Person = {{name:'test', age:24}}; | Add missing property. | TypeScript |
for (int i=0; i<87; i++) {{}} | for (int i=0; i<87; i++) {{}} | Correct. | Java |
with open('config.json') as fh:
data = fh.read() | with open('config.json') as fh:
data = fh.read() | Correct. | Python |
bar | bar() | Add parentheses. | Swift |
function render(b:string){{return b;}} render(61); | function render(b:string){{return b;}} render('message'); | Pass correct type. | TypeScript |
fn baz() -> i32 {{ 49 }} | fn baz() -> i32 {{ 49 }} | Correct. | Rust |
if bar > 64
print('data') | if bar > 64:
print('data') | Colon missing after if. | Python |
sys.sqrt(93) | import sys
sys.sqrt(93) | Import module first. | Python |
assert z > 70 | assert z > 70 | Correct. | Python |
function handle(): void {{ return 6; }} | function handle(): number {{ return 6; }} | Return type mismatch. | TypeScript |
let mut x=57; let ref1=&mut x; let r2=&mut x; | let mut x=57; {{ let ref1=&mut x; }} let r2=&mut x; | Only one mutable borrow. | Rust |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(72); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(72, () => console.log('listening')); | Add callback. | Node.js |
<img src='output.jpg'> | <img src='output.jpg' alt='desc'> | Add alt text. | HTML |
let x: Int = 'result' | let x: String = 'result' | Fix type. | Swift |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
items[66] | if items.indices.contains(66) {{ items[66] }} | Check index. | Swift |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
echo data world | echo 'data world' | Quote to prevent splitting. | Shell |
#header {{ color: blue; }} | #header {{ color: blue; }} | Correct. | CSS |
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