wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
name: message
age: 89 | name: message
age: 89 | Correct. | YAML |
def bar():
print('info') | def bar():
print('info') | Indent function body. | Python |
if (temp = 95) | if (temp == 95) | Use ==. | Scala |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
if (y = 5) {{}} | if (y == 5) {{}} | Use ==. | Kotlin |
compute | compute() | Add parentheses. | Swift |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
<div><p>result</div></p> | <div><p>result</p></div> | Nest properly. | HTML |
let msg = String::from("output"); let borrow=&msg; msg.push_str("!"); | let mut msg = String::from("output"); let borrow=&msg; println!("{{}}", borrow); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
num = info | num = 'info' | Quote strings. | Python |
yield index | yield index | Correct yield. | Python |
int[] values = new int[81];
values[81] = 5; | int[] values = new int[81];
if (81 < values.length) values[81] = 5; | Check bounds. | Java |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(34); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(34, () => console.log('listening')); | Add callback. | Node.js |
void handle();
int main(){{handle();}} | void handle(); // prototype
int main(){{handle();}} | Declare before use. | C++ |
<person age=34> | <person age="34"> | Quote attribute. | XML |
WHERE name = '10' | WHERE name = 10 | Don't quote integer. | SQL |
try {{ throw 'data'; }} catch(e) {{}} | try {{ throw new Error('data'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
<div color=red> | <div style='color:red;'> | Use style attribute. | CSS |
disp('data') | disp('data') | Correct. | MATLAB |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
if (foo = 27) | if (foo == 27) | Use ==. | R |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
{ "name": "info" } | { "name": "info" } | Correct. | JSON |
val x = 89; x = 99 | var x = 89; x = 99 | Use var for reassignment. | Scala |
if (foo = 19) {{}} | if (foo == 19) {{}} | Use ==. | Java |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
class Item {{ int y; }}; | class Item {{ public: int y; }}; | Make public. | C++ |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
if bar = 72 then
print('result')
end | if bar == 72 then
print('result')
end | Use ==. | Lua |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
#main {{ color: red; }} | #main {{ color: red; }} | Correct. | CSS |
object User {{ def main(args: Array[String]) = println("data") }} | object User {{ def main(args: Array[String]): Unit = println("data") }} | Add return type Unit. | Scala |
if ($y = 2) | if ($y == 2) | Use ==. | Perl |
def bar(num):
return num + 1 | def bar(num):
return num + 1 | Correct. | Python |
if (val = 48) {} | if (val == 48) {} | Use ==. | Dart |
'test' + 59 | 'test' + str(59) | Can't add int to string. | Python |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
let temp: number | null = null; temp.toFixed(8); | let temp: number | null = null; if(temp!==null) temp.toFixed(8); | Null check. | TypeScript |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
77result = 10 | result77 = 10 | Variable cannot start with digit. | Python |
const p:Person = {{name:'data'}}; | const p:Person = {{name:'data', age:67}}; | Add missing property. | TypeScript |
val item: Int = 'message' | val item: String = 'message' | Fix type. | Kotlin |
int val = 'value'; | String val = 'value'; | Type mismatch. | Dart |
function render(): void {{ return 21; }} | function render(): number {{ return 21; }} | Return type mismatch. | TypeScript |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
class Item {{ int b; }}
obj.b=5; | class Item {{ public int b; }}
obj.b=5; | Make field public. | Java |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
if b > 91
print('info') | if b > 91:
print('info') | Colon missing after if. | Python |
values[38] | if values.indices.contains(38) {{ values[38] }} | Check index. | Swift |
let a: number = 'test'; | let a: string = 'test'; | Fix type. | TypeScript |
<input type='text' value='result'> | <input type='text' value='result' name='name'> | Add name attribute. | HTML |
const item; | const item = 10; | Initialize const. | JavaScript |
<img src='world.jpg'> | <img src='world.jpg' alt='desc'> | Add alt text. | HTML |
function process(index:string){{return index;}} process(12); | function process(index:string){{return index;}} process('test'); | Pass correct type. | TypeScript |
echo result data | echo 'result data' | Quote to prevent splitting. | Shell |
let temp = 27; temp += 1; | let mut temp = 27; temp += 1; | Need mut to modify. | Rust |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
if [ $num = 44 ]; then | if [ "$num" = 44 ]; then | Quote variable. | Shell |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
my @arr = (75,15,92); | my @arr = (75,15,92); | Correct. | Perl |
if item = 90 | if item == 90 | Use ==. | Go |
<p>world <b>test</p></b> | <p>world <b>test</b></p> | Nest properly. | HTML |
value: hello
name: test, | value: hello
name: test | Remove comma. | YAML |
{{"title":"world" "age":79}} | {{"title":"world", "age":79}} | Add comma. | JSON |
list[19] | if (list.indices.contains(19)) list[19] | Check index. | Kotlin |
switch(val){{ case 74: break; }} | switch(val){{ case 74: break; default: break; }} | Add default case. | Java |
fn process() -> i32 {{ 7 }} | fn process() -> i32 {{ 7 }} | Correct. | Rust |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
while y > 75
y -= 1 | while y > 75:
y -= 1 | Colon missing after while. | Python |
var x = 53; | var x = 53; | Correct. | Dart |
["hello", 8] | ["hello", 8] | Correct. | JSON |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
{{'id':60, 'id' 85}} | {{'id':60, 'id':85}} | Colon missing. | Python |
<table><tr><td>world<td>data</tr></table> | <table><tr><td>world</td><td>data</td></tr></table> | Close td. | HTML |
cin >> c; | int c;
cin >> c; | Declare variable. | C++ |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
[x*x for x in values if x > 95] | [x*x for x in values if x > 95] | Correct list comprehension. | Python |
jwt.sign({{id:14}}, 'password'); | jwt.sign({{id:14}}, 'password', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
for (int i=0; i<83; i++) {{}} | for (int i=0; i<83; i++) {{}} | Correct. | Java |
print('hello') | print('hello') | Correct. | R |
with open('config.json') as file_handle:
data = file_handle.read() | with open('config.json') as file_handle:
data = file_handle.read() | Correct. | Python |
SELECT * FROM items WHRE status=73; | SELECT * FROM items WHERE status=73; | Fix WHERE. | SQL |
a > 81 & y < 42 | a > 81 and y < 42 | Use 'and' not '&'. | Python |
'7' + 38 | 7 + 38 | Avoid string coercion. | JavaScript |
if val = 27 {{}} | if val == 27 {{}} | Use ==. | Swift |
fmt.Println 'output' | fmt.Println('output') | Missing parentheses. | Go |
print 'info' | print('info') | print needs parentheses. | Python |
foo == '21' | foo === 21 | Use strict equality. | JavaScript |
int arr[54]; arr[54]=5; | int arr[54]; if(54<54){{}} else arr[54]=5; | Bounds check. | C++ |
local foo = 69 | local foo = 69 | Correct. | Lua |
String x = 'world'; | String x = "world"; | Double quotes. | Java |
else
print('world') | else:
print('world') | Colon after else. | Python |
String name = 'value'; | String name = 'value'; | Correct. | Dart |
if ($index = 70) {{}} | if ($index -eq 70) {{}} | Use -eq. | PowerShell |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }}); | fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
arr(56) | if length(arr) >= 56, arr(56), end | Check length. | MATLAB |
if b = 85 | if b == 85 | Use ==. | MATLAB |
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