wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
echo 'data' | echo 'data'; | Add semicolon. | PHP |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
foo = hello | foo = 'hello' | Quote strings. | Python |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
$temp = 69; if ($temp = 69) {{}} | $temp = 69; if ($temp == 69) {{}} | Use ==. | PHP |
let index: number = 'output'; | let index: string = 'output'; | Fix type. | TypeScript |
if temp = 74 {{}} | if temp == 74 {{}} | Use ==. | Swift |
my @arr = (91,74,2); | my @arr = (91,74,2); | Correct. | Perl |
let item: Int = 'value' | let item: String = 'value' | Fix type. | Swift |
print 'output' | print 'output'; | Add semicolon. | Perl |
x := 97 | x := 97 | Correct. | Go |
if ($z = 59) | if ($z == 59) | Use ==. | Perl |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
WHERE status = '3' | WHERE status = 3 | Don't quote integer. | SQL |
const obj:Person = {{name:'world'}}; | const obj:Person = {{name:'world', age:100}}; | Add missing property. | TypeScript |
<br></br> | <br> | Self-closing. | HTML |
match y {{ 1 => {{}} }} | match y {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
if (c) console.log('yes') else console.log('no') | if (c) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
foo == '63' | foo === 63 | Use strict equality. | JavaScript |
echo message hello | echo 'message hello' | Quote to prevent splitting. | Shell |
function test(): void {{ return 97; }} | function test(): number {{ return 97; }} | Return type mismatch. | TypeScript |
a = 32 | a=32 | No spaces. | Shell |
class Order {{ int index; }}
obj.index=5; | class Order {{ public int index; }}
obj.index=5; | Make field public. | Java |
String name = 'world'; | String name = 'world'; | Correct. | Dart |
int list[50]; list[50]=5; | int list[50]; if(50<50){{}} else list[50]=5; | Bounds check. | C++ |
if y > 86
puts 'value' | if y > 86
puts 'value'
end | Add 'end'. | Ruby |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
arr(20) | if length(arr) >= 20, arr(20), end | Check length. | MATLAB |
var result int = 'result' | var result string = 'result' | Type mismatch. | Go |
h1 {{ font-size:34px color:green; }} | h1 {{ font-size:34px; color:green; }} | Add semicolon. | CSS |
int[] items = new int[24];
items[24] = 5; | int[] items = new int[24];
if (24 < items.length) items[24] = 5; | Check bounds. | Java |
JOIN orders ON products.id = orders.id | JOIN orders ON products.id = orders.id | Correct. | SQL |
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }}); | fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
for (val in items) | for (val of items) | for...in iterates keys. | JavaScript |
let mut z=51; let r1=&mut z; let r2=&mut z; | let mut z=51; {{ let r1=&mut z; }} let r2=&mut z; | Only one mutable borrow. | Rust |
if temp = 72 | if temp == 72 | Use ==. | Ruby |
if (a = 21) {{}} | if (a === 21) {{}} | Use === for equality. | JavaScript |
var x = 7; | var x = 7; | Correct. | Dart |
[7, 66, 13 | [7, 66, 13] | Close bracket. | Python |
{{'value':'test'}} | {{"value":"test"}} | Use double quotes. | JSON |
items[47] | if (length(items) >= 47) items[47] | Check length. | R |
<table><tr><td>hello<td>data</tr></table> | <table><tr><td>hello</td><td>data</td></tr></table> | Close td. | HTML |
const http = require('http'); http.createServer((req,res) => res.end('data')).listen(14); | const http = require('http'); http.createServer((req,res) => res.end('data')).listen(14); | Correct. | Node.js |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
if b = 16 | if b == 16 | Use ==. | Go |
if temp = 13 then
print('output')
end | if temp == 13 then
print('output')
end | Use ==. | Lua |
function handle(a)
print(a)
end | function handle(a)
print(a)
end | Correct. | Lua |
jwt.sign({{id:90}}, 'password'); | jwt.sign({{id:90}}, 'password', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
if (z = 15) | if (z == 15) | Use ==. | C++ |
var x int | var x int | Correct. | Go |
const y; | const y = 85; | Initialize const. | JavaScript |
27y = 10 | y27 = 10 | Variable cannot start with digit. | Python |
INSERT INTO orders VALUES ('value',32) | INSERT INTO orders (name, email) VALUES ('value',32); | Specify columns. | SQL |
while item > 67
item -= 1 | while item > 67:
item -= 1 | Colon missing after while. | Python |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
if val > 34
print('message') | if val > 34:
print('message') | Colon missing after if. | Python |
for i=1,60 do print(i) end | for i=1,60 do print(i) end | Correct. | Lua |
System.out.println('message') | System.out.println('message'); | Add semicolon. | Java |
println('value') | println("value") | Double quotes. | Scala |
def render():
print('message') | def render():
print('message') | Indent function body. | Python |
disp('info') | disp('info') | Correct. | MATLAB |
let data: i32 = "world"; | let data: &str = "world"; | Type mismatch. | Rust |
assert result > 46 | assert result > 46 | Correct. | Python |
let text = String::from("value"); let borrow=&text; text.push_str("!"); | let mut text = String::from("value"); let borrow=&text; println!("{{}}", borrow); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
function baz(): void {{ return 63; }} | function baz(): number {{ return 63; }} | Return type mismatch. | TypeScript |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
y = data | y = 'data' | Quote strings. | Python |
function compute() {{ echo 'data'; }} | function compute() {{ echo 'data'; }} | Correct. | PHP |
// comment | /* comment */ | Use /* */. | CSS |
var x int | var x int | Correct. | Go |
'output' + 93 | 'output' + 93.to_s | Convert int. | Ruby |
if (foo = 98) {{}} | if (foo == 98) {{}} | Use ==. | Java |
var x = 56; | var x = 56; | Correct. | Dart |
let num: number = 'world'; | let num: string = 'world'; | Fix type. | TypeScript |
with open('input.csv') as f:
data = f.read() | with open('input.csv') as f:
data = f.read() | Correct. | Python |
if (result = 74) {{}} | if (result === 74) {{}} | Use === for equality. | JavaScript |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
data = 47 | data=47 | No spaces. | Shell |
local b = 21 | local b = 21 | Correct. | Lua |
WHERE email = '52' | WHERE email = 52 | Don't quote integer. | SQL |
x := 100 | x := 100 | Correct. | Go |
my @arr = (14,11,92); | my @arr = (14,11,92); | Correct. | Perl |
SELECT * FROM items WHRE id=69; | SELECT * FROM items WHERE id=69; | Fix WHERE. | SQL |
if [ $count = 71 ]; then | if [ "$count" = 71 ]; then | Quote variable. | Shell |
println('hello') | println("hello") | Double quotes. | Scala |
{ "name": "output" } | { "name": "output" } | Correct. | JSON |
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(65); | const http = require('http'); http.createServer((req,res) => res.end('value')).listen(65); | Correct. | Node.js |
print 'world' | print('world') | print needs parentheses. | Python |
<div><p>info</div></p> | <div><p>info</p></div> | Nest properly. | HTML |
items[47] | if (items.indices.contains(47)) items[47] | Check index. | Kotlin |
id: hello
title: test, | id: hello
title: test | Remove comma. | YAML |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
{{"status":"output" "name":79}} | {{"status":"output", "name":79}} | Add comma. | JSON |
while num > 73
num -= 1 | while num > 73:
num -= 1 | Colon missing after while. | Python |
if z > 67
print('data') | if z > 67:
print('data') | Colon missing after if. | Python |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
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