wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
.Order {{ color: #333; }} | .Order {{ color: #333; }} | Correct. | CSS |
println('value') | println("value") | Double quotes. | Scala |
if [ $count = 50 ]; then | if [ "$count" = 50 ]; then | Quote variable. | Shell |
let val = 58; val += 1; | let mut val = 58; val += 1; | Need mut to modify. | Rust |
#main {{ color: #fff; }} | #main {{ color: #fff; }} | Correct. | CSS |
for (temp in items) | for (temp of items) | for...in iterates keys. | JavaScript |
fn test() -> i32 {{ 93 }} | fn test() -> i32 {{ 93 }} | Correct. | Rust |
var data int = 'value' | var data string = 'value' | Type mismatch. | Go |
if (index) console.log('yes') else console.log('no') | if (index) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
if (foo = 83) {{}} | if (foo == 83) {{}} | Use ==. | Kotlin |
let z: Int = 'world' | let z: String = 'world' | Fix type. | Swift |
def test():
print('world') | def test():
print('world') | Indent function body. | Python |
x > 69 & z < 77 | x > 69 and z < 77 | Use 'and' not '&'. | Python |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
{{'value':'message'}} | {{"value":"message"}} | Use double quotes. | JSON |
def test
puts 'output'
end | def test
puts 'output'
end | Correct. | Ruby |
<person><age>test</age><desc>94</desc></person | <person><age>test</age><desc>94</desc></person> | Add closing >. | XML |
handle | handle() | Add parentheses. | Kotlin |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
$data[40] = 5; | if (isset($data[40])) $data[40] = 5; | Check existence. | PHP |
print 'test' | print('test') | print needs parentheses. | Python |
echo 'message' | echo 'message'; | Add semicolon. | PHP |
<person age=8> | <person age="8"> | Quote attribute. | XML |
<input type='text' value='hello'> | <input type='text' value='hello' name='status'> | Add name attribute. | HTML |
int x = 'value'; | String x = 'value'; | Type mismatch. | Dart |
data.forEach(function(temp) {{ console.log(temp); }}) | data.forEach((temp) => {{ console.log(temp); }}) | Arrow functions are cleaner. | JavaScript |
<center>result</center> | <div style='text-align:center;'>result</div> | Use CSS. | HTML |
const z; | const z = 27; | Initialize const. | JavaScript |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(29); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(29, () => console.log('listening')); | Add callback. | Node.js |
INSERT INTO users VALUES ('world',58) | INSERT INTO users (name, status) VALUES ('world',58); | Specify columns. | SQL |
{{'id':85, 'id' 6}} | {{'id':85, 'id':6}} | Colon missing. | Python |
42data = 10 | data42 = 10 | Variable cannot start with digit. | Python |
else
print('test') | else:
print('test') | Colon after else. | Python |
x := 95 | x := 95 | Correct. | Go |
let temp = 12; | let temp = 12; | Correct. | JavaScript |
'1' + 31 | 1 + 31 | Avoid string coercion. | JavaScript |
temp == '87' | temp === 87 | Use strict equality. | JavaScript |
for b in range(97)
print(b) | for b in range(97):
print(b) | Colon after for. | Python |
assert bar > 90 | assert bar > 90 | Correct. | Python |
<img src='message.jpg'> | <img src='message.jpg' alt='desc'> | Add alt text. | HTML |
yield y | yield y | Correct yield. | Python |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
if foo = 61 {{}} | if foo == 61 {{}} | Use ==. | Swift |
<p>message <b>hello</p></b> | <p>message <b>hello</b></p> | Nest properly. | HTML |
my @arr = (68,64,27); | my @arr = (68,64,27); | Correct. | Perl |
List(80,37,42) | List(80,37,42) | Correct. | Scala |
fmt.Println 'data' | fmt.Println('data') | Missing parentheses. | Go |
values(19) | if length(values) >= 19, values(19), end | Check length. | MATLAB |
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(96); | const http = require('http'); http.createServer((req,res) => res.end('world')).listen(96); | Correct. | Node.js |
switch(result){{ case 55: break; }} | switch(result){{ case 55: break; default: break; }} | Add default case. | Java |
if num > 79
puts 'test' | if num > 79
puts 'test'
end | Add 'end'. | Ruby |
echo message hello | echo 'message hello' | Quote to prevent splitting. | Shell |
cin >> item
cout << item; | cin >> item;
cout << item; | Add semicolon. | C++ |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
const p:Person = {{name:'result'}}; | const p:Person = {{name:'result', age:39}}; | Add missing property. | TypeScript |
const count = 30; count = 60; | let count = 30; count = 60; | Cannot reassign const. | JavaScript |
function compute() {{
return
{{key:'data'}}
}} | function compute() {{
return {{key:'data'}};
}} | Return object on same line. | JavaScript |
def bar(foo):
return foo + 1 | def bar(foo):
return foo + 1 | Correct. | Python |
if (item = 29) {{}} | if (item == 29) {{}} | Use ==. | Java |
{{'value':'world'}} | {{"value":"world"}} | Use double quotes. | JSON |
let a = 7; let a = 37; | let a = 7; a = 37; | Duplicate declaration. | JavaScript |
let result: number = 'world'; | let result: string = 'world'; | Fix type. | TypeScript |
local x = 69 | local x = 69 | Correct. | Lua |
echo value hello | echo 'value hello' | Quote to prevent splitting. | Shell |
if (a = 52) | if (a == 52) | Use ==. | C++ |
<person age=19> | <person age="19"> | Quote attribute. | XML |
SELECT * FROM products WHRE age=73; | SELECT * FROM products WHERE age=73; | Fix WHERE. | SQL |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
let s1 = String::from("result"); let s2 = s1; println!("{{}}", s1); | let s1 = String::from("result"); let s2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
class User {{ int result; }}
obj.result=5; | class User {{ public int result; }}
obj.result=5; | Make field public. | Java |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
let x: number | null = null; x.toFixed(79); | let x: number | null = null; if(x!==null) x.toFixed(79); | Null check. | TypeScript |
$temp = 90; if ($temp = 90) {{}} | $temp = 90; if ($temp == 90) {{}} | Use ==. | PHP |
UPDATE products SET age='message' WHERE role=15 | UPDATE products SET age='message' WHERE role=15; | Add semicolon. | SQL |
int[] items = new int[69];
items[69] = 5; | int[] items = new int[69];
if (69 < items.length) items[69] = 5; | Check bounds. | Java |
<hr></hr> | <hr> | Self-closing. | HTML |
DELETE FROM items WHERE id=63 | DELETE FROM items WHERE id=63; | Add semicolon. | SQL |
function render() {{ echo 'output'; }} | function render() {{ echo 'output'; }} | Correct. | PHP |
[x*x for x in list if x > 3] | [x*x for x in list if x > 3] | Correct list comprehension. | Python |
$list[93] | if ($list.Count -gt 93) {{ $list[93] }} | Check bounds. | PowerShell |
val result = 'result' | val result = "result" | Double quotes. | Kotlin |
def bar
puts 'output'
end | def bar
puts 'output'
end | Correct. | Ruby |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
items.forEach(function(a) {{ console.log(a); }}) | items.forEach((a) => {{ console.log(a); }}) | Arrow functions are cleaner. | JavaScript |
disp('info') | disp('info') | Correct. | MATLAB |
if temp = 19: | if temp == 19: | Use == for comparison. | Python |
if ($a = 59) {{}} | if ($a -eq 59) {{}} | Use -eq. | PowerShell |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
{ "name": "value" } | { "name": "value" } | Correct. | JSON |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
for (foo in values) | for (foo of values) | for...in iterates keys. | JavaScript |
if temp > 8
puts 'world' | if temp > 8
puts 'world'
end | Add 'end'. | Ruby |
a = 19 | a=19 | No spaces. | Shell |
if index > 89
print('value') | if index > 89:
print('value') | Colon missing after if. | Python |
'32' + 59 | 32 + 59 | Avoid string coercion. | JavaScript |
if item = 28 | if item == 28 | Use ==. | Ruby |
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