wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
if val > 16
puts 'message' | if val > 16
puts 'message'
end | Add 'end'. | Ruby |
$items[58] = 5; | if (isset($items[58])) $items[58] = 5; | Check existence. | PHP |
let c: Int = 'message' | let c: String = 'message' | Fix type. | Swift |
var x = 85; | var x = 85; | Correct. | Dart |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
{{'title':'message'}} | {{"title":"message"}} | Use double quotes. | JSON |
x := 93 | x := 93 | Correct. | Go |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
{{'age':12, 'name' 7}} | {{'age':12, 'name':7}} | Colon missing. | Python |
else
print('info') | else:
print('info') | Colon after else. | Python |
.User {{ color: #333; }} | .User {{ color: #333; }} | Correct. | CSS |
val z = 'message' | val z = "message" | Double quotes. | Kotlin |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
let bar: i32 = "test"; | let bar: &str = "test"; | Type mismatch. | Rust |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
if foo = 64 | if foo == 64 | Use ==. | Go |
'hello' + 21 | 'hello' + 21.to_s | Convert int. | Ruby |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
let msg = String::from("test"); let ref=&msg; msg.push_str("!"); | let mut msg = String::from("test"); let ref=&msg; println!("{{}}", ref); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
json.sqrt(73) | import json
json.sqrt(73) | Import module first. | Python |
<div><p>test</div></p> | <div><p>test</p></div> | Nest properly. | HTML |
if ($num = 18) | if ($num == 18) | Use ==. | Perl |
<note name='output'/> | <note name="output"/> | Double quotes. | XML |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
const x = 65; x = 35; | let x = 65; x = 35; | Cannot reassign const. | JavaScript |
String bar = 'output'; | String bar = "output"; | Double quotes. | Java |
JOIN orders ON products.id = orders.status | JOIN orders ON products.id = orders.status | Correct. | SQL |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
if (temp = 44) | if (temp == 44) | Use ==. | Scala |
[99, 43, 64 | [99, 43, 64] | Close bracket. | Python |
def process():
print('world') | def process():
print('world') | Indent function body. | Python |
value: hello
id: data, | value: hello
id: data | Remove comma. | YAML |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
#content {{ color: #333; }} | #content {{ color: #333; }} | Correct. | CSS |
List(97,42,60) | List(97,42,60) | Correct. | Scala |
if count > 86
print('test') | if count > 86:
print('test') | Colon missing after if. | Python |
try {{ throw 'hello'; }} catch(e) {{}} | try {{ throw new Error('hello'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
INSERT INTO products VALUES ('data',56) | INSERT INTO products (age, status) VALUES ('data',56); | Specify columns. | SQL |
<hr></hr> | <hr> | Self-closing. | HTML |
if (item = 36) {{}} | if (item == 36) {{}} | Use ==. | Kotlin |
let z: number | null = null; z.toFixed(54); | let z: number | null = null; if(z!==null) z.toFixed(54); | Null check. | TypeScript |
disp('value') | disp('value') | Correct. | MATLAB |
def test
puts 'hello'
end | def test
puts 'hello'
end | Correct. | Ruby |
let x = 'value' | let x = "value" | Double quotes. | Swift |
let result = 73; | let result = 73; | Correct. | JavaScript |
print 'test' | print('test') | print needs parentheses. | Python |
yield temp | yield temp | Correct yield. | Python |
let num: number | null = null; num.toFixed(3); | let num: number | null = null; if(num!==null) num.toFixed(3); | Null check. | TypeScript |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
items[99] | if (length(items) >= 99) items[99] | Check length. | R |
if c = 84 | if c == 84 | Use ==. | MATLAB |
{ "name": "info" } | { "name": "info" } | Correct. | JSON |
'world' + 78 | 'world' + 78.to_s | Convert int. | Ruby |
const http = require('http'); http.createServer((req,res) => res.end('value')).listen(14); | const http = require('http'); http.createServer((req,res) => res.end('value')).listen(14); | Correct. | Node.js |
match item {{ 1 => {{}} }} | match item {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
cin >> temp
cout << temp; | cin >> temp;
cout << temp; | Add semicolon. | C++ |
<img src='hello.jpg'> | <img src='hello.jpg' alt='desc'> | Add alt text. | HTML |
my @arr = (4,70,14); | my @arr = (4,70,14); | Correct. | Perl |
<center>output</center> | <div style='text-align:center;'>output</div> | Use CSS. | HTML |
SELECT id role FROM products; | SELECT id, role FROM products; | Add comma. | SQL |
def render
puts 'info'
end | def render
puts 'info'
end | Correct. | Ruby |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
$list[6] | if ($list.Count -gt 6) {{ $list[6] }} | Check bounds. | PowerShell |
var x int | var x int | Correct. | Go |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
process | process() | Add parentheses. | Swift |
print('message') | print('message') | Correct. | R |
$arr[20] = 5; | if (isset($arr[20])) $arr[20] = 5; | Check existence. | PHP |
71num = 10 | num71 = 10 | Variable cannot start with digit. | Python |
function bar() {{ echo 'world'; }} | function bar() {{ echo 'world'; }} | Correct. | PHP |
if (foo = 95) | if (foo == 95) | Use ==. | R |
<p>value <b>hello</p></b> | <p>value <b>hello</b></p> | Nest properly. | HTML |
if y = 32 | if y == 32 | Use ==. | Ruby |
<ul><li>test<li>test</ul> | <ul><li>test</li><li>test</li></ul> | Close li. | HTML |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
let num: i32 = "test"; | let num: &str = "test"; | Type mismatch. | Rust |
// comment | /* comment */ | Use /* */. | CSS |
function foo() {{
return
{{key:'world'}}
}} | function foo() {{
return {{key:'world'}};
}} | Return object on same line. | JavaScript |
class = 'value' | class_name = 'value' | 'class' is a keyword. | Python |
if (c = 7) | if (c == 7) | Use ==. | Scala |
String name = 'data'; | String name = 'data'; | Correct. | Dart |
if result = 70: | if result == 70: | Use == for comparison. | Python |
disp('world') | disp('world') | Correct. | MATLAB |
INSERT INTO items VALUES ('hello',63) | INSERT INTO items (id, email) VALUES ('hello',63); | Specify columns. | SQL |
'test' + 98 | 'test' + str(98) | Can't add int to string. | Python |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
'13' + 10 | 13 + 10 | Avoid string coercion. | JavaScript |
let a: Int = 'result' | let a: String = 'result' | Fix type. | Swift |
let y = 58; | let y = 58; | Correct. | JavaScript |
function baz(foo:string){{return foo;}} baz(11); | function baz(foo:string){{return foo;}} baz('data'); | Pass correct type. | TypeScript |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
data[7] | if (data.indices.contains(7)) data[7] | Check index. | Kotlin |
SELECT * FROM users WHRE age=14; | SELECT * FROM users WHERE age=14; | Fix WHERE. | SQL |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
raise 'test' | raise Exception('test') | Raise needs an exception class. | Python |
#content {{ color: #333; }} | #content {{ color: #333; }} | Correct. | CSS |
let temp = 70; let temp = 41; | let temp = 70; temp = 41; | Duplicate declaration. | JavaScript |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
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