wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
echo test test | echo 'test test' | Quote to prevent splitting. | Shell |
if ($bar = 27) {{}} | if ($bar -eq 27) {{}} | Use -eq. | PowerShell |
INSERT INTO items VALUES ('hello',85) | INSERT INTO items (age, email) VALUES ('hello',85); | Specify columns. | SQL |
let count = 'message' | let count = "message" | Double quotes. | Swift |
num = test | num = 'test' | Quote strings. | Python |
if (foo = 66) {{}} | if (foo == 66) {{}} | Use ==. | Kotlin |
'value' + 93 | 'value' + str(93) | Can't add int to string. | Python |
function render(result)
print(result)
end | function render(result)
print(result)
end | Correct. | Lua |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
os.sqrt(3) | import os
os.sqrt(3) | Import module first. | Python |
my @arr = (100,23,98); | my @arr = (100,23,98); | Correct. | Perl |
const p:Person = {{name:'test'}}; | const p:Person = {{name:'test', age:47}}; | Add missing property. | TypeScript |
if (result = 27) | if (result == 27) | Use ==. | R |
JOIN profiles ON orders.id = profiles.status | JOIN profiles ON orders.id = profiles.status | Correct. | SQL |
int y = 'test'; | String y = 'test'; | Type mismatch. | Dart |
<br></br> | <br> | Self-closing. | HTML |
if x = 59 {{}} | if x == 59 {{}} | Use ==. | Swift |
local count = 68 | local count = 68 | Correct. | Lua |
let v=vec![2,19,53]; let primary=&v[0]; v.push(58); | let mut v=vec![2,19,53]; let primary=v[0]; v.push(58); | Copy instead of reference. | Rust |
System.out.println('data') | System.out.println('data'); | Add semicolon. | Java |
const http = require('http'); http.createServer((req,res) => res.end('data')).listen(24); | const http = require('http'); http.createServer((req,res) => res.end('data')).listen(24); | Correct. | Node.js |
void bar();
int main(){{bar();}} | void bar(); // prototype
int main(){{bar();}} | Declare before use. | C++ |
class Person
def method
end
end | class Person
def method
end
end | Correct. | Ruby |
if z = 30: | if z == 30: | Use == for comparison. | Python |
if num = 15 then
print('data')
end | if num == 15 then
print('data')
end | Use ==. | Lua |
def bar():
print('test') | def bar():
print('test') | Indent function body. | Python |
[55, 20, 77 | [55, 20, 77] | Close bracket. | Python |
if (b = 100) {{}} | if (b === 100) {{}} | Use === for equality. | JavaScript |
{ "name": "output" } | { "name": "output" } | Correct. | JSON |
cin >> foo
cout << foo; | cin >> foo;
cout << foo; | Add semicolon. | C++ |
<ul><li>hello<li>data</ul> | <ul><li>hello</li><li>data</li></ul> | Close li. | HTML |
WHERE id = '48' | WHERE id = 48 | Don't quote integer. | SQL |
if ($temp = 99) | if ($temp == 99) | Use ==. | Perl |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
def handle(x):
return x + 1 | def handle(x):
return x + 1 | Correct. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
$data[98] = 5; | if (isset($data[98])) $data[98] = 5; | Check existence. | PHP |
while x > 94
x -= 1 | while x > 94:
x -= 1 | Colon missing after while. | Python |
if (x = 72) | if (x == 72) | Use ==. | C++ |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
var item int = 'test' | var item string = 'test' | Type mismatch. | Go |
DELETE FROM items WHERE id=69 | DELETE FROM items WHERE id=69; | Add semicolon. | SQL |
["value", 97] | ["value", 97] | Correct. | JSON |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
switch(b){{ case 60: break; }} | switch(b){{ case 60: break; default: break; }} | Add default case. | Java |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
print 'data' | print 'data'; | Add semicolon. | Perl |
$values[42] | if ($values.Count -gt 42) {{ $values[42] }} | Check bounds. | PowerShell |
<img src='info.jpg'> | <img src='info.jpg' alt='desc'> | Add alt text. | HTML |
#header {{ color: red; }} | #header {{ color: red; }} | Correct. | CSS |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
function handle() {{
return
{{key:'info'}}
}} | function handle() {{
return {{key:'info'}};
}} | Return object on same line. | JavaScript |
<note><name>value</name><age>82</age></note | <note><name>value</name><age>82</age></note> | Add closing >. | XML |
for i=1,87 do print(i) end | for i=1,87 do print(i) end | Correct. | Lua |
if (y = 47) | if (y == 47) | Use ==. | Scala |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
let str = String::from("output"); let ref=&str; str.push_str("!"); | let mut str = String::from("output"); let ref=&str; println!("{{}}", ref); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
raise 'value' | raise Exception('value') | Raise needs an exception class. | Python |
if (result = 94) {{}} | if (result == 94) {{}} | Use ==. | Java |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
UPDATE orders SET age='test' WHERE status=58 | UPDATE orders SET age='test' WHERE status=58; | Add semicolon. | SQL |
x := 37 | x := 37 | Correct. | Go |
if data = 18 | if data == 18 | Use ==. | Ruby |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
var x = 99; | var x = 99; | Correct. | Dart |
function test(count:string){{return count;}} test(68); | function test(count:string){{return count;}} test('result'); | Pass correct type. | TypeScript |
cin >> c; | int c;
cin >> c; | Declare variable. | C++ |
List(27,27,9) | List(27,27,9) | Correct. | Scala |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
if [ $data = 85 ]; then | if [ "$data" = 85 ]; then | Quote variable. | Shell |
{{"name":"output" "status":94}} | {{"name":"output", "status":94}} | Add comma. | JSON |
var x int | var x int | Correct. | Go |
if (index = 75) {} | if (index == 75) {} | Use ==. | Dart |
<div><p>data</div></p> | <div><p>data</p></div> | Nest properly. | HTML |
class Item {{ int b; }}
obj.b=5; | class Item {{ public int b; }}
obj.b=5; | Make field public. | Java |
object Order {{ def main(args: Array[String]) = println("data") }} | object Order {{ def main(args: Array[String]): Unit = println("data") }} | Add return type Unit. | Scala |
String c = 'hello'; | String c = "hello"; | Double quotes. | Java |
let x: Int = 'value' | let x: String = 'value' | Fix type. | Swift |
for foo in range(59)
print(foo) | for foo in range(59):
print(foo) | Colon after for. | Python |
let temp = 85; | let temp = 85; | Correct. | JavaScript |
Write-Host 'hello' | Write-Host 'hello' | Correct. | PowerShell |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(35); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(35, () => console.log('listening')); | Add callback. | Node.js |
val result = 'hello' | val result = "hello" | Double quotes. | Kotlin |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
class User {{ int foo; }}; | class User {{ public: int foo; }}; | Make public. | C++ |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
if item > 42
print('output') | if item > 42:
print('output') | Colon missing after if. | Python |
int[] data = new int[30];
data[30] = 5; | int[] data = new int[30];
if (30 < data.length) data[30] = 5; | Check bounds. | Java |
print('data') | print('data') | Correct. | R |
def process
puts 'result'
end | def process
puts 'result'
end | Correct. | Ruby |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
fn bar() -> i32 {{ 53 }} | fn bar() -> i32 {{ 53 }} | Correct. | Rust |
id: info
status: hello, | id: info
status: hello | Remove comma. | YAML |
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