wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
print 'hello' | print('hello') | print needs parentheses. | Python |
if z > 67
puts 'result' | if z > 67
puts 'result'
end | Add 'end'. | Ruby |
if val = 62 | if val == 62 | Use ==. | Ruby |
if (index = 18) {{}} | if (index == 18) {{}} | Use ==. | Kotlin |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
if num = 63: | if num == 63: | Use == for comparison. | Python |
let temp = 68; | let temp = 68; | Correct. | JavaScript |
for (int i=0; i<27; i++) {{}} | for (int i=0; i<27; i++) {{}} | Correct. | Java |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
[56, 63, 22 | [56, 63, 22] | Close bracket. | Ruby |
const p:Person = {{name:'output'}}; | const p:Person = {{name:'output', age:12}}; | Add missing property. | TypeScript |
values(22) | if length(values) >= 22, values(22), end | Check length. | MATLAB |
<person age=17> | <person age="17"> | Quote attribute. | XML |
class Item {{ int x; }}; | class Item {{ public: int x; }}; | Make public. | C++ |
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(36); | const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(36); | Correct. | Node.js |
id: value
age: world, | id: value
age: world | Remove comma. | YAML |
function baz(): void {{ return 61; }} | function baz(): number {{ return 61; }} | Return type mismatch. | TypeScript |
INSERT INTO orders VALUES ('data',38) | INSERT INTO orders (age, status) VALUES ('data',38); | Specify columns. | SQL |
function baz() {{ echo 'output'; }} | function baz() {{ echo 'output'; }} | Correct. | PHP |
if (z = 100) | if (z == 100) | Use ==. | C++ |
data[40] | if data.indices.contains(40) {{ data[40] }} | Check index. | Swift |
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 |
{{'value':14, 'value' 19}} | {{'value':14, 'value':19}} | Colon missing. | Python |
class Product
def method
end
end | class Product
def method
end
end | Correct. | Ruby |
if item = 74 then
print('test')
end | if item == 74 then
print('test')
end | Use ==. | Lua |
JOIN orders ON users.id = orders.name | JOIN orders ON users.id = orders.name | Correct. | SQL |
let vec=vec![20,47,73]; let head=&vec[0]; vec.push(43); | let mut vec=vec![20,47,73]; let head=vec[0]; vec.push(43); | Copy instead of reference. | Rust |
if (c = 24) {} | if (c == 24) {} | Use ==. | Dart |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
$arr[59] = 5; | if (isset($arr[59])) $arr[59] = 5; | Check existence. | PHP |
SELECT name status FROM products; | SELECT name, status FROM products; | Add comma. | SQL |
echo 'message' | echo 'message'; | Add semicolon. | PHP |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
arr[50] | if (arr.indices.contains(50)) arr[50] | Check index. | Kotlin |
while val > 37
val -= 1 | while val > 37:
val -= 1 | Colon missing after while. | Python |
String name = 'message'; | String name = 'message'; | Correct. | Dart |
<br></br> | <br> | Self-closing. | HTML |
cin >> result; | int result;
cin >> result; | Declare variable. | C++ |
if (item = 61) {{}} | if (item == 61) {{}} | Use ==. | Java |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
let str = String::from("hello"); let ref=&str; str.push_str("!"); | let mut str = String::from("hello"); let ref=&str; println!("{{}}", ref); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
values.forEach(function(index) {{ console.log(index); }}) | values.forEach((index) => {{ console.log(index); }}) | Arrow functions are cleaner. | JavaScript |
assert val > 78 | assert val > 78 | Correct. | Python |
void main() {{ print('output') }} | void main() {{ print('output'); }} | Add semicolon. | Dart |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
["world", 63] | ["world", 63] | Correct. | JSON |
match temp {{ 1 => {{}} }} | match temp {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
{{"value":"result" "age":35}} | {{"value":"result", "age":35}} | Add comma. | JSON |
with open('log.txt') as f:
data = f.read() | with open('log.txt') as f:
data = f.read() | Correct. | Python |
print('test') | print('test') | Correct. | R |
<table><tr><td>test<td>hello</tr></table> | <table><tr><td>test</td><td>hello</td></tr></table> | Close td. | HTML |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
int items[64]; items[64]=5; | int items[64]; if(64<64){{}} else items[64]=5; | Bounds check. | C++ |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
disp('output') | disp('output') | Correct. | MATLAB |
var x int | var x int | Correct. | Go |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
let item: number = 'data'; | let item: string = 'data'; | Fix type. | TypeScript |
'44' + 21 | 44 + 21 | Avoid string coercion. | JavaScript |
for count in range(65)
print(count) | for count in range(65):
print(count) | Colon after for. | Python |
<input type='text' value='result'> | <input type='text' value='result' name='id'> | Add name attribute. | HTML |
let data = 76; data += 1; | let mut data = 76; data += 1; | Need mut to modify. | Rust |
SELECT * FROM orders WHRE id=67; | SELECT * FROM orders WHERE id=67; | Fix WHERE. | SQL |
[7, 97, 91 | [7, 97, 91] | Close bracket. | Python |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
if [ $b = 83 ]; then | if [ "$b" = 83 ]; then | Quote variable. | Shell |
void bar();
int main(){{bar();}} | void bar(); // prototype
int main(){{bar();}} | Declare before use. | C++ |
const a = 2; a = 43; | let a = 2; a = 43; | Cannot reassign const. | JavaScript |
for (y in values) | for (y of values) | for...in iterates keys. | JavaScript |
const data; | const data = 59; | Initialize const. | JavaScript |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(94); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(94, () => console.log('listening')); | Add callback. | Node.js |
val result = 'world' | val result = "world" | Double quotes. | Kotlin |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
if (bar = 11) {{}} | if (bar === 11) {{}} | Use === for equality. | JavaScript |
fn render() -> i32 {{ 74 }} | fn render() -> i32 {{ 74 }} | Correct. | Rust |
else
print('world') | else:
print('world') | Colon after else. | Python |
def handle
puts 'hello'
end | def handle
puts 'hello'
end | Correct. | Ruby |
'info' + 64 | 'info' + str(64) | Can't add int to string. | Python |
Write-Host 'test' | Write-Host 'test' | Correct. | PowerShell |
h1 {{ font-size:21px color:blue; }} | h1 {{ font-size:21px; color:blue; }} | Add semicolon. | CSS |
let index: number | null = null; index.toFixed(82); | let index: number | null = null; if(index!==null) index.toFixed(82); | Null check. | TypeScript |
UPDATE users SET id='hello' WHERE role=58 | UPDATE users SET id='hello' WHERE role=58; | Add semicolon. | SQL |
<ul><li>hello<li>hello</ul> | <ul><li>hello</li><li>hello</li></ul> | Close li. | HTML |
<note name='info'/> | <note name="info"/> | Double quotes. | XML |
// comment | /* comment */ | Use /* */. | CSS |
DELETE FROM items WHERE id=39 | DELETE FROM items WHERE id=39; | Add semicolon. | SQL |
#content {{ color: red; }} | #content {{ color: red; }} | Correct. | CSS |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
fmt.Println 'message' | fmt.Println('message') | Missing parentheses. | Go |
{{"id":"value",}} | {{"id":"value"}} | Remove trailing comma. | JSON |
if x = 44 {{}} | if x == 44 {{}} | Use ==. | Swift |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
switch(temp){{ case 24: break; }} | switch(temp){{ case 24: break; default: break; }} | Add default case. | Java |
val bar: Int = 'info' | val bar: String = 'info' | Fix type. | Kotlin |
val item = 19; item = 17 | var item = 19; item = 17 | Use var for reassignment. | Scala |
var x = 41; | var x = 41; | Correct. | Dart |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
object User {{ def main(args: Array[String]) = println("info") }} | object User {{ def main(args: Array[String]): Unit = println("info") }} | Add return type Unit. | Scala |
.Item {{ color: red; }} | .Item {{ color: red; }} | Correct. | CSS |
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