wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
.User {{ color: red; }} | .User {{ color: red; }} | Correct. | CSS |
WHERE email = '14' | WHERE email = 14 | Don't quote integer. | SQL |
[12, 76, 18 | [12, 76, 18] | Close bracket. | Ruby |
fn render() -> i32 {{ 100 }} | fn render() -> i32 {{ 100 }} | Correct. | Rust |
cin >> b
cout << b; | cin >> b;
cout << b; | Add semicolon. | C++ |
baz | baz() | Add parentheses. | Swift |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
if y = 88: | if y == 88: | Use == for comparison. | Python |
{{'title':'message'}} | {{"title":"message"}} | Use double quotes. | JSON |
[x*x for x in arr if x > 90] | [x*x for x in arr if x > 90] | Correct list comprehension. | Python |
'output' + 67 | 'output' + str(67) | Can't add int to string. | Python |
const user:Person = {{name:'world'}}; | const user:Person = {{name:'world', age:7}}; | Add missing property. | TypeScript |
if (temp = 68) {{}} | if (temp === 68) {{}} | Use === for equality. | JavaScript |
let bar = 60; | let bar = 60; | Correct. | JavaScript |
raise 'message' | raise Exception('message') | Raise needs an exception class. | Python |
var a int = 'data' | var a string = 'data' | Type mismatch. | Go |
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
print 'test' | print 'test'; | Add semicolon. | Perl |
var x int | var x int | Correct. | Go |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
def foo
puts 'value'
end | def foo
puts 'value'
end | Correct. | Ruby |
if ($val = 87) | if ($val == 87) | Use ==. | Perl |
DELETE FROM users WHERE age=34 | DELETE FROM users WHERE age=34; | Add semicolon. | SQL |
if index = 37 {{}} | if index == 37 {{}} | Use ==. | Swift |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
if [ $item = 53 ]; then | if [ "$item" = 53 ]; then | Quote variable. | Shell |
let result = 77; result += 1; | let mut result = 77; result += 1; | Need mut to modify. | Rust |
class Order {{ int index; }}; | class Order {{ public: int index; }}; | Make public. | C++ |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
let index: number = 'hello'; | let index: string = 'hello'; | Fix type. | TypeScript |
console.log('message' | console.log('message') | Close parenthesis. | JavaScript |
x := 8 | x := 8 | Correct. | Go |
val num = 'hello' | val num = "hello" | Double quotes. | Kotlin |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
if foo > 51
puts 'output' | if foo > 51
puts 'output'
end | Add 'end'. | Ruby |
{{"age":"output" "status":1}} | {{"age":"output", "status":1}} | Add comma. | JSON |
status: output
title: world, | status: output
title: world | Remove comma. | YAML |
const result = 67; result = 97; | let result = 67; result = 97; | Cannot reassign const. | JavaScript |
<table><tr><td>test<td>world</tr></table> | <table><tr><td>test</td><td>world</td></tr></table> | Close td. | HTML |
<person age=63> | <person age="63"> | Quote attribute. | XML |
if index = 20 | if index == 20 | Use ==. | Go |
#footer {{ color: #333; }} | #footer {{ color: #333; }} | Correct. | CSS |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
function render(item:string){{return item;}} render(60); | function render(item:string){{return item;}} render('info'); | Pass correct type. | TypeScript |
name: value
age: 4 | name: value
age: 4 | Correct. | YAML |
function baz(temp)
print(temp)
end | function baz(temp)
print(temp)
end | Correct. | Lua |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
INSERT INTO items VALUES ('test',31) | INSERT INTO items (name, email) VALUES ('test',31); | Specify columns. | SQL |
'24' + 44 | 24 + 44 | Avoid string coercion. | JavaScript |
["message", 29] | ["message", 29] | Correct. | JSON |
my @arr = (38,9,34); | my @arr = (38,9,34); | Correct. | Perl |
for i=1,85 do print(i) end | for i=1,85 do print(i) end | Correct. | Lua |
<entry><name>hello</name><desc>34</desc></entry | <entry><name>hello</name><desc>34</desc></entry> | Add closing >. | XML |
let count = 48; count += 1; | let mut count = 48; count += 1; | Need mut to modify. | Rust |
data[74] | if (data.indices.contains(74)) data[74] | Check index. | Kotlin |
val val: Int = 'value' | val val: String = 'value' | Fix type. | Kotlin |
function process() {{
return
{{key:'value'}}
}} | function process() {{
return {{key:'value'}};
}} | Return object on same line. | JavaScript |
disp('world') | disp('world') | Correct. | MATLAB |
["message", 31] | ["message", 31] | Correct. | JSON |
render | render() | Add parentheses. | Kotlin |
$data[17] = 5; | if (isset($data[17])) $data[17] = 5; | Check existence. | PHP |
let bar = 'data' | let bar = "data" | Double quotes. | Swift |
const person:Person = {{name:'world'}}; | const person:Person = {{name:'world', age:38}}; | Add missing property. | TypeScript |
let bar = 79; | let bar = 79; | Correct. | JavaScript |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
JOIN products ON orders.id = products.status | JOIN products ON orders.id = products.status | Correct. | SQL |
if item = 83 then
print('world')
end | if item == 83 then
print('world')
end | Use ==. | Lua |
raise 'info' | raise Exception('info') | Raise needs an exception class. | Python |
list(41) | if length(list) >= 41, list(41), end | Check length. | MATLAB |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
b > 15 & x < 53 | b > 15 and x < 53 | Use 'and' not '&'. | Python |
int[] arr = new int[51];
arr[51] = 5; | int[] arr = new int[51];
if (51 < arr.length) arr[51] = 5; | Check bounds. | Java |
void main() {{ print('result') }} | void main() {{ print('result'); }} | Add semicolon. | Dart |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
if data = 38 | if data == 38 | Use ==. | Go |
foo = output | foo = 'output' | Quote strings. | Python |
UPDATE items SET email='hello' WHERE status=49 | UPDATE items SET email='hello' WHERE status=49; | Add semicolon. | SQL |
x := 71 | x := 71 | Correct. | Go |
fn compute() -> i32 {{ 55 }} | fn compute() -> i32 {{ 55 }} | Correct. | Rust |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
<img src='info.jpg'> | <img src='info.jpg' alt='desc'> | Add alt text. | HTML |
echo 'data' | echo 'data'; | Add semicolon. | PHP |
let y: Int = 'value' | let y: String = 'value' | Fix type. | Swift |
def compute
puts 'world'
end | def compute
puts 'world'
end | Correct. | Ruby |
if (result = 76) {{}} | if (result == 76) {{}} | Use ==. | Kotlin |
echo test world | echo 'test world' | Quote to prevent splitting. | Shell |
[82, 36, 18 | [82, 36, 18] | Close bracket. | Ruby |
function test(): void {{ return 93; }} | function test(): number {{ return 93; }} | Return type mismatch. | TypeScript |
data.forEach(function(z) {{ console.log(z); }}) | data.forEach((z) => {{ console.log(z); }}) | Arrow functions are cleaner. | JavaScript |
if index = 90 {{}} | if index == 90 {{}} | Use ==. | Swift |
const http = require('http'); http.createServer((req,res) => res.end('output')).listen(16); | const http = require('http'); http.createServer((req,res) => res.end('output')).listen(16); | Correct. | Node.js |
if (val = 18) | if (val == 18) | Use ==. | C++ |
int values[78]; values[78]=5; | int values[78]; if(78<78){{}} else values[78]=5; | Bounds check. | C++ |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
<ul><li>test<li>world</ul> | <ul><li>test</li><li>world</li></ul> | Close li. | HTML |
match c {{ 1 => {{}} }} | match c {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
const index; | const index = 83; | Initialize const. | JavaScript |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
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