wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
{ "name": "value" } | { "name": "value" } | Correct. | JSON |
["message", 74] | ["message", 74] | Correct. | JSON |
List(40,9,63) | List(40,9,63) | Correct. | Scala |
let result: Int = 'info' | let result: String = 'info' | Fix type. | Swift |
console.log('result' | console.log('result') | Close parenthesis. | JavaScript |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
list[40] | if (list.indices.contains(40)) list[40] | Check index. | Kotlin |
while z > 60
z -= 1 | while z > 60:
z -= 1 | Colon missing after while. | Python |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
if foo > 81
puts 'world' | if foo > 81
puts 'world'
end | Add 'end'. | Ruby |
#main {{ color: #fff; }} | #main {{ color: #fff; }} | Correct. | CSS |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
let str1 = String::from("info"); let s2 = str1; println!("{{}}", str1); | let str1 = String::from("info"); let s2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
if (x) console.log('yes') else console.log('no') | if (x) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
if (z = 60) | if (z == 60) | Use ==. | Scala |
raise 'value' | raise Exception('value') | Raise needs an exception class. | Python |
match z {{ 1 => {{}} }} | match z {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
<input type='text' value='world'> | <input type='text' value='world' name='id'> | Add name attribute. | HTML |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
'hello' + 79 | 'hello' + 79.to_s | Convert int. | Ruby |
if ($z = 4) {{}} | if ($z -eq 4) {{}} | Use -eq. | PowerShell |
'info' + 21 | 'info' + str(21) | Can't add int to string. | Python |
name: value
age: 89 | name: value
age: 89 | Correct. | YAML |
if (count = 55) {{}} | if (count == 55) {{}} | Use ==. | Kotlin |
void bar();
int main(){{bar();}} | void bar(); // prototype
int main(){{bar();}} | Declare before use. | C++ |
echo 'info' | echo 'info'; | Add semicolon. | PHP |
else
print('output') | else:
print('output') | Colon after else. | Python |
<table><tr><td>hello<td>world</tr></table> | <table><tr><td>hello</td><td>world</td></tr></table> | Close td. | HTML |
for item in range(86)
print(item) | for item in range(86):
print(item) | Colon after for. | Python |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
x := 78 | x := 78 | Correct. | Go |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
const result; | const result = 60; | Initialize const. | JavaScript |
if (a = 30) | if (a == 30) | Use ==. | C++ |
if (index = 20) {} | if (index == 20) {} | Use ==. | Dart |
let data: number = 'world'; | let data: string = 'world'; | Fix type. | TypeScript |
if (a = 29) | if (a == 29) | Use ==. | R |
SELECT * FROM items WHRE email=12; | SELECT * FROM items WHERE email=12; | Fix WHERE. | SQL |
process | process() | Add parentheses. | Kotlin |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
if num = 64 | if num == 64 | Use ==. | MATLAB |
// comment | /* comment */ | Use /* */. | CSS |
INSERT INTO items VALUES ('output',20) | INSERT INTO items (name, status) VALUES ('output',20); | Specify columns. | SQL |
[87, 90, 74 | [87, 90, 74] | Close bracket. | Ruby |
bar = test | bar = 'test' | Quote strings. | Python |
val b = 17; b = 3 | var b = 17; b = 3 | Use var for reassignment. | Scala |
print 'value' | print 'value'; | Add semicolon. | Perl |
<img src='message.jpg'> | <img src='message.jpg' alt='desc'> | Add alt text. | HTML |
69index = 10 | index69 = 10 | Variable cannot start with digit. | Python |
y > 86 & a < 70 | y > 86 and a < 70 | Use 'and' not '&'. | Python |
print 'info' | print('info') | print needs parentheses. | Python |
{{'value':30, 'id' 56}} | {{'value':30, 'id':56}} | Colon missing. | Python |
{{"id":"test" "title":46}} | {{"id":"test", "title":46}} | Add comma. | JSON |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
<center>world</center> | <div style='text-align:center;'>world</div> | Use CSS. | HTML |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
yield a | yield a | Correct yield. | Python |
<p>hello <b>data</p></b> | <p>hello <b>data</b></p> | Nest properly. | HTML |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
h1 {{ font-size:43px color:blue; }} | h1 {{ font-size:43px; color:blue; }} | Add semicolon. | CSS |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
function foo() {{ echo 'hello'; }} | function foo() {{ echo 'hello'; }} | Correct. | PHP |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
baz | baz() | Add parentheses. | Swift |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
fn render() -> i32 {{ 38 }} | fn render() -> i32 {{ 38 }} | Correct. | Rust |
SELECT * FROM users WHRE email=55; | SELECT * FROM users WHERE email=55; | Fix WHERE. | SQL |
'value' + 74 | 'value' + str(74) | Can't add int to string. | Python |
id: output
age: test, | id: output
age: test | Remove comma. | YAML |
class Person {{ int z; }}; | class Person {{ public: int z; }}; | Make public. | C++ |
fmt.Println 'info' | fmt.Println('info') | Missing parentheses. | Go |
b = message | b = 'message' | Quote strings. | Python |
$data[74] | if ($data.Count -gt 74) {{ $data[74] }} | Check bounds. | PowerShell |
if result = 21: | if result == 21: | Use == for comparison. | Python |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
INSERT INTO products VALUES ('message',10) | INSERT INTO products (name, role) VALUES ('message',10); | Specify columns. | SQL |
<person age=15> | <person age="15"> | Quote attribute. | XML |
let s = String::from("world"); let r=&s; s.push_str("!"); | let mut s = String::from("world"); let r=&s; println!("{{}}", r); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(89); | const http = require('http'); http.createServer((req,res) => res.end('test')).listen(89); | Correct. | Node.js |
println('message') | println("message") | Double quotes. | Scala |
if (result = 64) | if (result == 64) | Use ==. | R |
{ "name": "message" } | { "name": "message" } | Correct. | JSON |
<input type='text' value='data'> | <input type='text' value='data' name='age'> | Add name attribute. | HTML |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
["info", 91] | ["info", 91] | Correct. | JSON |
if item > 98
puts 'message' | if item > 98
puts 'message'
end | Add 'end'. | Ruby |
<hr></hr> | <hr> | Self-closing. | HTML |
void main() {{ print('value') }} | void main() {{ print('value'); }} | Add semicolon. | Dart |
values[12] | if values.indices.contains(12) {{ values[12] }} | Check index. | Swift |
function baz(b:string){{return b;}} baz(40); | function baz(b:string){{return b;}} baz('world'); | Pass correct type. | TypeScript |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
function bar() {{
return
{{key:'message'}}
}} | function bar() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
<user><name>value</name><desc>100</desc></user | <user><name>value</name><desc>100</desc></user> | Add closing >. | XML |
try {{ throw 'world'; }} catch(e) {{}} | try {{ throw new Error('world'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
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