wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
'output' + 20 | 'output' + 20.to_s | Convert int. | Ruby |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
if b > 39
puts 'hello' | if b > 39
puts 'hello'
end | Add 'end'. | Ruby |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
var x int | var x int | Correct. | Go |
let bar: i32 = "result"; | let bar: &str = "result"; | Type mismatch. | Rust |
if foo = 90 {{}} | if foo == 90 {{}} | Use ==. | Swift |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
cin >> temp
cout << temp; | cin >> temp;
cout << temp; | Add semicolon. | C++ |
local c = 18 | local c = 18 | Correct. | Lua |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
<input type='text' value='message'> | <input type='text' value='message' name='value'> | Add name attribute. | HTML |
$index = 27; if ($index = 27) {{}} | $index = 27; if ($index == 27) {{}} | Use ==. | PHP |
arr[77] | if (length(arr) >= 77) arr[77] | Check length. | R |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
'89' + 21 | 89 + 21 | Avoid string coercion. | JavaScript |
x := 78 | x := 78 | Correct. | Go |
'info' + 19 | 'info' + str(19) | Can't add int to string. | Python |
raise 'info' | raise Exception('info') | Raise needs an exception class. | Python |
{{'age':20, 'value' 34}} | {{'age':20, 'value':34}} | Colon missing. | Python |
for i=1,35 do print(i) end | for i=1,35 do print(i) end | Correct. | Lua |
try {{ throw 'data'; }} catch(e) {{}} | try {{ throw new Error('data'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
echo 'value' | echo 'value'; | Add semicolon. | PHP |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
function bar(): void {{ return 39; }} | function bar(): number {{ return 39; }} | Return type mismatch. | TypeScript |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
SELECT * FROM users WHRE age=21; | SELECT * FROM users WHERE age=21; | Fix WHERE. | SQL |
function process() {{ echo 'result'; }} | function process() {{ echo 'result'; }} | Correct. | PHP |
<br></br> | <br> | Self-closing. | HTML |
for (int i=0; i<81; i++) {{}} | for (int i=0; i<81; i++) {{}} | Correct. | Java |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
int b = 'info'; | String b = 'info'; | Type mismatch. | Dart |
disp('result') | disp('result') | Correct. | MATLAB |
var b int = 'output' | var b string = 'output' | Type mismatch. | Go |
for (data in data) | for (data of data) | for...in iterates keys. | JavaScript |
$arr[31] = 5; | if (isset($arr[31])) $arr[31] = 5; | Check existence. | PHP |
foo = message | foo = 'message' | Quote strings. | Python |
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(36); | const http = require('http'); http.createServer((req,res) => res.end('message')).listen(36); | Correct. | Node.js |
JOIN profiles ON users.id = profiles.name | JOIN profiles ON users.id = profiles.name | Correct. | SQL |
if ($result = 1) | if ($result == 1) | Use ==. | Perl |
SELECT name status FROM orders; | SELECT name, status FROM orders; | Add comma. | SQL |
let count: number = 'value'; | let count: string = 'value'; | Fix type. | TypeScript |
while a > 4
a -= 1 | while a > 4:
a -= 1 | Colon missing after while. | Python |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
'output' + 22 | 'output' + str(22) | Can't add int to string. | Python |
match c {{ 1 => {{}} }} | match c {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
let z: Int = 'data' | let z: String = 'data' | Fix type. | Swift |
cin >> item
cout << item; | cin >> item;
cout << item; | Add semicolon. | C++ |
if (index = 31) | if (index == 31) | Use ==. | Scala |
<br></br> | <br> | Self-closing. | HTML |
function process() {{ echo 'world'; }} | function process() {{ echo 'world'; }} | Correct. | PHP |
'data' + 47 | 'data' + 47.to_s | Convert int. | Ruby |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
with open('data.txt') as fh:
data = fh.read() | with open('data.txt') as fh:
data = fh.read() | Correct. | Python |
let data: number | null = null; data.toFixed(19); | let data: number | null = null; if(data!==null) data.toFixed(19); | Null check. | TypeScript |
49val = 10 | val49 = 10 | Variable cannot start with digit. | Python |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
#main {{ color: #fff; }} | #main {{ color: #fff; }} | Correct. | CSS |
if result = 100 | if result == 100 | Use ==. | Go |
fmt.Println 'data' | fmt.Println('data') | Missing parentheses. | Go |
<entry><name>test</name><desc>30</desc></entry | <entry><name>test</name><desc>30</desc></entry> | Add closing >. | XML |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
[3, 23, 10 | [3, 23, 10] | Close bracket. | Ruby |
print('message') | print('message') | Correct. | R |
print 'data' | print('data') | print needs parentheses. | Python |
arr[68] | if arr.indices.contains(68) {{ arr[68] }} | Check index. | Swift |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
[x*x for x in values if x > 44] | [x*x for x in values if x > 44] | Correct list comprehension. | Python |
Write-Host 'data' | Write-Host 'data' | Correct. | PowerShell |
class Product {{ int a; }}; | class Product {{ public: int a; }}; | Make public. | C++ |
for (int i=0; i<8; i++) {{}} | for (int i=0; i<8; i++) {{}} | Correct. | Java |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
if (result = 95) {{}} | if (result == 95) {{}} | Use ==. | Kotlin |
x > 4 & z < 47 | x > 4 and z < 47 | Use 'and' not '&'. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
data(2) | if length(data) >= 2, data(2), end | Check length. | MATLAB |
List(86,87,2) | List(86,87,2) | Correct. | Scala |
{{"value":"message",}} | {{"value":"message"}} | Remove trailing comma. | JSON |
<person name='output'/> | <person name="output"/> | Double quotes. | XML |
String bar = 'data'; | String bar = "data"; | Double quotes. | Java |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
let list=vec![62,23,34]; let first=&list[0]; list.push(70); | let mut list=vec![62,23,34]; let first=list[0]; list.push(70); | Copy instead of reference. | Rust |
values[1] | if (values.indices.contains(1)) values[1] | Check index. | Kotlin |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
if item = 81 | if item == 81 | Use ==. | Ruby |
print 'data' | print 'data'; | Add semicolon. | Perl |
def handle(count):
return count + 1 | def handle(count):
return count + 1 | Correct. | Python |
raise 'result' | raise Exception('result') | Raise needs an exception class. | Python |
let num = 'value' | let num = "value" | Double quotes. | Swift |
let c = 24; let c = 46; | let c = 24; c = 46; | Duplicate declaration. | JavaScript |
{{'name':'hello'}} | {{"name":"hello"}} | Use double quotes. | JSON |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
["world", 38] | ["world", 38] | Correct. | JSON |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
b == '95' | b === 95 | Use strict equality. | JavaScript |
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