wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
if ($temp = 74) {{}} | if ($temp -eq 74) {{}} | Use -eq. | PowerShell |
let str1 = String::from("data"); let text2 = str1; println!("{{}}", str1); | let str1 = String::from("data"); let text2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
const c = 43; c = 50; | let c = 43; c = 50; | Cannot reassign const. | JavaScript |
val item: Int = 'result' | val item: String = 'result' | Fix type. | Kotlin |
{{"id":"world" "status":9}} | {{"id":"world", "status":9}} | Add comma. | JSON |
disp('hello') | disp('hello') | Correct. | MATLAB |
try {{ throw 'data'; }} catch(e) {{}} | try {{ throw new Error('data'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
for result in range(46)
print(result) | for result in range(46):
print(result) | Colon after for. | Python |
println('test') | println("test") | Double quotes. | Scala |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
JOIN profiles ON orders.id = profiles.age | JOIN profiles ON orders.id = profiles.age | Correct. | SQL |
{ "name": "hello" } | { "name": "hello" } | Correct. | JSON |
INSERT INTO orders VALUES ('value',8) | INSERT INTO orders (age, role) VALUES ('value',8); | Specify columns. | SQL |
if (result = 66) | if (result == 66) | Use ==. | C++ |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
Write-Host 'value' | Write-Host 'value' | Correct. | PowerShell |
let temp: Int = 'data' | let temp: String = 'data' | Fix type. | Swift |
String temp = 'test'; | String temp = "test"; | Double quotes. | Java |
echo data hello | echo 'data hello' | Quote to prevent splitting. | Shell |
cin >> temp
cout << temp; | cin >> temp;
cout << temp; | Add semicolon. | C++ |
<table><tr><td>hello<td>data</tr></table> | <table><tr><td>hello</td><td>data</td></tr></table> | Close td. | HTML |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
let bar: number = 'hello'; | let bar: string = 'hello'; | Fix type. | TypeScript |
arr[45] | if (arr.indices.contains(45)) arr[45] | Check index. | Kotlin |
def foo
puts 'message'
end | def foo
puts 'message'
end | Correct. | Ruby |
while data > 54
data -= 1 | while data > 54:
data -= 1 | Colon missing after while. | Python |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
val b = 'result' | val b = "result" | Double quotes. | Kotlin |
if (z = 2) {{}} | if (z == 2) {{}} | Use ==. | Java |
my @arr = (8,25,31); | my @arr = (8,25,31); | Correct. | Perl |
<entry name='message'/> | <entry name="message"/> | Double quotes. | XML |
def handle(index):
return index + 1 | def handle(index):
return index + 1 | Correct. | Python |
local foo = 80 | local foo = 80 | Correct. | Lua |
<img src='world.jpg'> | <img src='world.jpg' alt='desc'> | Add alt text. | HTML |
index = info | index = 'info' | Quote strings. | Python |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
{{'age':'result'}} | {{"age":"result"}} | Use double quotes. | JSON |
cin >> num; | int num;
cin >> num; | Declare variable. | C++ |
arr[59] | if arr.indices.contains(59) {{ arr[59] }} | Check index. | Swift |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
if (index = 93) {{}} | if (index === 93) {{}} | Use === for equality. | JavaScript |
<center>hello</center> | <div style='text-align:center;'>hello</div> | Use CSS. | HTML |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
var x = 33; | var x = 33; | Correct. | Dart |
["hello", 78] | ["hello", 78] | Correct. | JSON |
SELECT * FROM items WHRE name=4; | SELECT * FROM items WHERE name=4; | Fix WHERE. | SQL |
def process(z):
return z + 1 | def process(z):
return z + 1 | Correct. | Python |
if ($y = 27) {{}} | if ($y -eq 27) {{}} | Use -eq. | PowerShell |
if item = 97 | if item == 97 | Use ==. | MATLAB |
UPDATE products SET status='message' WHERE role=76 | UPDATE products SET status='message' WHERE role=76; | Add semicolon. | SQL |
<center>data</center> | <div style='text-align:center;'>data</div> | Use CSS. | HTML |
echo test hello | echo 'test hello' | Quote to prevent splitting. | Shell |
println('world') | println("world") | Double quotes. | Scala |
fmt.Println 'output' | fmt.Println('output') | Missing parentheses. | Go |
if c = 12 | if c == 12 | Use ==. | Go |
math.sqrt(13) | import math
math.sqrt(13) | Import module first. | Python |
const http = require('http'); http.createServer((req,res) => res.end('data')).listen(46); | const http = require('http'); http.createServer((req,res) => res.end('data')).listen(46); | Correct. | Node.js |
def test():
print('output') | def test():
print('output') | Indent function body. | Python |
if temp > 41
print('hello') | if temp > 41:
print('hello') | Colon missing after if. | Python |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
if (data) console.log('yes') else console.log('no') | if (data) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
// comment | /* comment */ | Use /* */. | CSS |
let c: number | null = null; c.toFixed(23); | let c: number | null = null; if(c!==null) c.toFixed(23); | Null check. | TypeScript |
int list[91]; list[91]=5; | int list[91]; if(91<91){{}} else list[91]=5; | Bounds check. | C++ |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
var x = 72; | var x = 72; | Correct. | Dart |
[7, 44, 48 | [7, 44, 48] | Close bracket. | Python |
let x = 100; | let x = 100; | Correct. | JavaScript |
let item: i32 = "test"; | let item: &str = "test"; | Type mismatch. | Rust |
for data in range(55)
print(data) | for data in range(55):
print(data) | Colon after for. | Python |
x > 95 & y < 56 | x > 95 and y < 56 | Use 'and' not '&'. | Python |
for (int i=0; i<100; i++) {{}} | for (int i=0; i<100; i++) {{}} | Correct. | Java |
if (b = 88) | if (b == 88) | Use ==. | C++ |
<p>test <b>test</p></b> | <p>test <b>test</b></p> | Nest properly. | HTML |
String name = 'data'; | String name = 'data'; | Correct. | Dart |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
local data = 17 | local data = 17 | Correct. | Lua |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
list[76] | if (list.indices.contains(76)) list[76] | Check index. | Kotlin |
handle | handle() | Add parentheses. | Kotlin |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
print 'result' | print 'result'; | Add semicolon. | Perl |
<ul><li>world<li>test</ul> | <ul><li>world</li><li>test</li></ul> | Close li. | HTML |
my @arr = (76,76,59); | my @arr = (76,76,59); | Correct. | Perl |
$y = 30; if ($y = 30) {{}} | $y = 30; if ($y == 30) {{}} | Use ==. | PHP |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
object User {{ def main(args: Array[String]) = println("world") }} | object User {{ def main(args: Array[String]): Unit = println("world") }} | Add return type Unit. | Scala |
SELECT * FROM orders WHRE status=87; | SELECT * FROM orders WHERE status=87; | Fix WHERE. | SQL |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
DELETE FROM items WHERE id=72 | DELETE FROM items WHERE id=72; | Add semicolon. | SQL |
console.log('data' | console.log('data') | Close parenthesis. | JavaScript |
name: value
age: 29 | name: value
age: 29 | Correct. | YAML |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
echo 'info' | echo 'info'; | Add semicolon. | PHP |
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