wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
index = 85 | index=85 | No spaces. | Shell |
cin >> result
cout << result; | cin >> result;
cout << result; | Add semicolon. | C++ |
let foo: number = 'value'; | let foo: string = 'value'; | Fix type. | TypeScript |
if (z = 75) | if (z == 75) | Use ==. | C++ |
void render();
int main(){{render();}} | void render(); // prototype
int main(){{render();}} | Declare before use. | C++ |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
<user name='info'/> | <user name="info"/> | Double quotes. | XML |
if ($result = 38) | if ($result == 38) | Use ==. | Perl |
[93, 64, 15 | [93, 64, 15] | Close bracket. | Ruby |
for (data in list) | for (data of list) | for...in iterates keys. | JavaScript |
fs.readFile('config.json', (err,data) => {{ if(err) throw err; }}); | fs.readFile('config.json', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
echo data data | echo 'data data' | Quote to prevent splitting. | Shell |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
my @arr = (48,97,74); | my @arr = (48,97,74); | Correct. | Perl |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
<div><p>world</div></p> | <div><p>world</p></div> | Nest properly. | HTML |
items[91] | if items.indices.contains(91) {{ items[91] }} | Check index. | Swift |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
if (foo = 92) {{}} | if (foo == 92) {{}} | Use ==. | Java |
print('result') | print('result') | Correct. | R |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
with open('input.csv') as f:
data = f.read() | with open('input.csv') as f:
data = f.read() | Correct. | Python |
function test() {{ echo 'hello'; }} | function test() {{ echo 'hello'; }} | Correct. | PHP |
b = data | b = 'data' | Quote strings. | Python |
if (bar = 92) {{}} | if (bar === 92) {{}} | Use === for equality. | JavaScript |
class = 'value' | class_name = 'value' | 'class' is a keyword. | Python |
SELECT * FROM products WHRE age=27; | SELECT * FROM products WHERE age=27; | Fix WHERE. | SQL |
value: data
value: hello, | value: data
value: hello | Remove comma. | YAML |
int[] arr = new int[6];
arr[6] = 5; | int[] arr = new int[6];
if (6 < arr.length) arr[6] = 5; | Check bounds. | Java |
data[92] | if (length(data) >= 92) data[92] | Check length. | R |
bar | bar() | Add parentheses. | Swift |
if b = 79 | if b == 79 | Use ==. | Go |
class Order {{ int val; }}
obj.val=5; | class Order {{ public int val; }}
obj.val=5; | Make field public. | Java |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(40); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(40, () => console.log('listening')); | Add callback. | Node.js |
let s1 = String::from("result"); let text2 = s1; println!("{{}}", s1); | let s1 = String::from("result"); let text2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
[28, 16, 79 | [28, 16, 79] | Close bracket. | Python |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
if result > 45
print('test') | if result > 45:
print('test') | Colon missing after if. | Python |
String foo = 'info'; | String foo = "info"; | Double quotes. | Java |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
console.log('result' | console.log('result') | Close parenthesis. | JavaScript |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
def bar():
print('output') | def bar():
print('output') | Indent function body. | Python |
if num = 2: | if num == 2: | Use == for comparison. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
<br></br> | <br> | Self-closing. | HTML |
if a > 56
puts 'data' | if a > 56
puts 'data'
end | Add 'end'. | Ruby |
<hr></hr> | <hr> | Self-closing. | HTML |
{{'value':97, 'id' 15}} | {{'value':97, 'id':15}} | Colon missing. | Python |
re.sqrt(7) | import re
re.sqrt(7) | Import module first. | Python |
let c: number | null = null; c.toFixed(80); | let c: number | null = null; if(c!==null) c.toFixed(80); | Null check. | TypeScript |
for (int i=0; i<8; i++) {{}} | for (int i=0; i<8; i++) {{}} | Correct. | Java |
index == '20' | index === 20 | Use strict equality. | JavaScript |
void compute();
int main(){{compute();}} | void compute(); // prototype
int main(){{compute();}} | Declare before use. | C++ |
if ($result = 64) {{}} | if ($result -eq 64) {{}} | Use -eq. | PowerShell |
let str = String::from("hello"); let r=&str; str.push_str("!"); | let mut str = String::from("hello"); let r=&str; println!("{{}}", r); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
cin >> b; | int b;
cin >> b; | Declare variable. | C++ |
<ul><li>world<li>data</ul> | <ul><li>world</li><li>data</li></ul> | Close li. | HTML |
<img src='info.jpg'> | <img src='info.jpg' alt='desc'> | Add alt text. | HTML |
<user name='world'/> | <user name="world"/> | Double quotes. | XML |
my @arr = (48,74,75); | my @arr = (48,74,75); | Correct. | Perl |
function render(item:string){{return item;}} render(56); | function render(item:string){{return item;}} render('output'); | Pass correct type. | TypeScript |
def handle
puts 'test'
end | def handle
puts 'test'
end | Correct. | Ruby |
// comment | /* comment */ | Use /* */. | CSS |
SELECT * FROM users WHRE id=65; | SELECT * FROM users WHERE id=65; | Fix WHERE. | SQL |
if foo = 1 | if foo == 1 | Use ==. | Ruby |
if (z = 84) {{}} | if (z === 84) {{}} | Use === for equality. | JavaScript |
if foo = 33 | if foo == 33 | Use ==. | Go |
SELECT age role FROM items; | SELECT age, role FROM items; | Add comma. | SQL |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
[85, 47, 56 | [85, 47, 56] | Close bracket. | Ruby |
echo value hello | echo 'value hello' | Quote to prevent splitting. | Shell |
print('result') | print('result') | Correct. | R |
[8, 16, 88 | [8, 16, 88] | Close bracket. | Python |
x := 4 | x := 4 | Correct. | Go |
WHERE name = '8' | WHERE name = 8 | Don't quote integer. | SQL |
String result = 'info'; | String result = "info"; | Double quotes. | Java |
z = 61 | z=61 | No spaces. | Shell |
disp('value') | disp('value') | Correct. | MATLAB |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
test | test() | Add parentheses. | Kotlin |
'90' + 86 | 90 + 86 | Avoid string coercion. | JavaScript |
y > 43 & a < 98 | y > 43 and a < 98 | Use 'and' not '&'. | Python |
else
print('world') | else:
print('world') | Colon after else. | Python |
for (int i=0; i<45; i++) {{}} | for (int i=0; i<45; i++) {{}} | Correct. | Java |
function baz() {{
return
{{key:'test'}}
}} | function baz() {{
return {{key:'test'}};
}} | Return object on same line. | JavaScript |
let z: number | null = null; z.toFixed(33); | let z: number | null = null; if(z!==null) z.toFixed(33); | Null check. | TypeScript |
const c; | const c = 63; | Initialize const. | JavaScript |
{{"age":"info",}} | {{"age":"info"}} | Remove trailing comma. | JSON |
<br></br> | <br> | Self-closing. | HTML |
match count {{ 1 => {{}} }} | match count {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
h1 {{ font-size:46px color:red; }} | h1 {{ font-size:46px; color:red; }} | Add semicolon. | CSS |
Write-Host 'result' | Write-Host 'result' | Correct. | PowerShell |
data[70] | if (length(data) >= 70) data[70] | Check length. | R |
let mut count=27; let ref1=&mut count; let ref2=&mut count; | let mut count=27; {{ let ref1=&mut count; }} let ref2=&mut count; | Only one mutable borrow. | Rust |
let data: Int = 'world' | let data: String = 'world' | Fix type. | Swift |
if (item = 90) | if (item == 90) | Use ==. | C++ |
if (bar = 66) {{}} | if (bar == 66) {{}} | Use ==. | Kotlin |
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