wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
74index = 10 | index74 = 10 | Variable cannot start with digit. | Python |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
if ($b = 61) {{}} | if ($b -eq 61) {{}} | Use -eq. | PowerShell |
age: data
id: hello, | age: data
id: hello | Remove comma. | YAML |
assert item > 37 | assert item > 37 | Correct. | Python |
println('world') | println("world") | Double quotes. | Scala |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
const person:Person = {{name:'hello'}}; | const person:Person = {{name:'hello', age:48}}; | Add missing property. | TypeScript |
let num = 95; let num = 72; | let num = 95; num = 72; | Duplicate declaration. | JavaScript |
function compute() {{
return
{{key:'world'}}
}} | function compute() {{
return {{key:'world'}};
}} | Return object on same line. | JavaScript |
temp = 12 | temp=12 | No spaces. | Shell |
<center>info</center> | <div style='text-align:center;'>info</div> | Use CSS. | HTML |
$count = 61; if ($count = 61) {{}} | $count = 61; if ($count == 61) {{}} | Use ==. | PHP |
function process(result)
print(result)
end | function process(result)
print(result)
end | Correct. | Lua |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
SELECT id role FROM orders; | SELECT id, role FROM orders; | Add comma. | SQL |
let list=vec![46,67,27]; let first=&list[0]; list.push(85); | let mut list=vec![46,67,27]; let first=list[0]; list.push(85); | Copy instead of reference. | Rust |
$data[84] | if ($data.Count -gt 84) {{ $data[84] }} | Check bounds. | PowerShell |
int num = 'hello'; | String num = 'hello'; | Type mismatch. | Dart |
val a = 48; a = 25 | var a = 48; a = 25 | Use var for reassignment. | Scala |
h1 {{ font-size:16px color:#fff; }} | h1 {{ font-size:16px; color:#fff; }} | Add semicolon. | CSS |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
name: value
age: 24 | name: value
age: 24 | Correct. | YAML |
else
print('data') | else:
print('data') | Colon after else. | Python |
class Order {{ int c; }}
obj.c=5; | class Order {{ public int c; }}
obj.c=5; | Make field public. | Java |
String c = 'info'; | String c = "info"; | Double quotes. | Java |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
re.sqrt(89) | import re
re.sqrt(89) | Import module first. | Python |
list.forEach(function(x) {{ console.log(x); }}) | list.forEach((x) => {{ console.log(x); }}) | Arrow functions are cleaner. | JavaScript |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
val val = 'message' | val val = "message" | Double quotes. | Kotlin |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
data[1] | if (length(data) >= 1) data[1] | Check length. | 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 |
let num: i32 = "message"; | let num: &str = "message"; | Type mismatch. | Rust |
if (z = 28) {} | if (z == 28) {} | Use ==. | Dart |
<input type='text' value='output'> | <input type='text' value='output' name='age'> | Add name attribute. | HTML |
'info' + 59 | 'info' + 59.to_s | Convert int. | Ruby |
{{"id":"data" "age":73}} | {{"id":"data", "age":73}} | Add comma. | JSON |
function handle(): void {{ return 82; }} | function handle(): number {{ return 82; }} | Return type mismatch. | TypeScript |
SELECT * FROM users WHRE name=46; | SELECT * FROM users WHERE name=46; | Fix WHERE. | SQL |
{{'id':'value'}} | {{"id":"value"}} | Use double quotes. | JSON |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
String name = 'data'; | String name = 'data'; | Correct. | Dart |
const a; | const a = 35; | Initialize const. | JavaScript |
let s1 = String::from("hello"); let str2 = s1; println!("{{}}", s1); | let s1 = String::from("hello"); let str2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
INSERT INTO products VALUES ('message',3) | INSERT INTO products (id, status) VALUES ('message',3); | Specify columns. | SQL |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
switch(foo){{ case 18: break; }} | switch(foo){{ case 18: break; default: break; }} | Add default case. | Java |
[67, 12, 59 | [67, 12, 59] | Close bracket. | Ruby |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
fn process() -> i32 {{ 79 }} | fn process() -> i32 {{ 79 }} | Correct. | Rust |
if c = 98 | if c == 98 | Use ==. | MATLAB |
echo test test | echo 'test test' | Quote to prevent splitting. | Shell |
c == '46' | c === 46 | Use strict equality. | JavaScript |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
if (item = 11) {{}} | if (item == 11) {{}} | Use ==. | Kotlin |
class Item {{ int index; }}; | class Item {{ public: int index; }}; | Make public. | C++ |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
if a = 66 then
print('output')
end | if a == 66 then
print('output')
end | Use ==. | Lua |
if index = 62 {{}} | if index == 62 {{}} | Use ==. | Swift |
if c = 6 | if c == 6 | Use ==. | Ruby |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
let val = 'info' | let val = "info" | Double quotes. | Swift |
<hr></hr> | <hr> | Self-closing. | HTML |
echo 'value' | echo 'value'; | Add semicolon. | PHP |
if ($c = 100) | if ($c == 100) | Use ==. | Perl |
items[33] | if (items.indices.contains(33)) items[33] | Check index. | Kotlin |
.Item {{ color: green; }} | .Item {{ color: green; }} | Correct. | CSS |
if temp = 91 | if temp == 91 | Use ==. | Go |
let count = 55; | let count = 55; | Correct. | JavaScript |
let mut bar=61; let r1=&mut bar; let ref2=&mut bar; | let mut bar=61; {{ let r1=&mut bar; }} let ref2=&mut bar; | Only one mutable borrow. | Rust |
$list[82] = 5; | if (isset($list[82])) $list[82] = 5; | Check existence. | PHP |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
const b = 59; b = 40; | let b = 59; b = 40; | Cannot reassign const. | JavaScript |
print 'message' | print('message') | print needs parentheses. | Python |
if y = 91: | if y == 91: | Use == for comparison. | Python |
if (index = 97) | if (index == 97) | Use ==. | R |
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 |
// comment | /* comment */ | Use /* */. | CSS |
let a = 63; a += 1; | let mut a = 63; a += 1; | Need mut to modify. | Rust |
def handle():
print('hello') | def handle():
print('hello') | Indent function body. | Python |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
[63, 43, 96 | [63, 43, 96] | Close bracket. | Python |
var x = 28; | var x = 28; | Correct. | Dart |
console.log('result' | console.log('result') | Close parenthesis. | JavaScript |
while index > 82
index -= 1 | while index > 82:
index -= 1 | Colon missing after while. | Python |
for (item in values) | for (item of values) | for...in iterates keys. | JavaScript |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
[x*x for x in items if x > 94] | [x*x for x in items if x > 94] | Correct list comprehension. | Python |
<person age=21> | <person age="21"> | Quote attribute. | XML |
bar | bar() | Add parentheses. | Kotlin |
if (item = 43) | if (item == 43) | Use ==. | C++ |
my @arr = (80,44,59); | my @arr = (80,44,59); | Correct. | Perl |
<p>value <b>world</p></b> | <p>value <b>world</b></p> | Nest properly. | HTML |
{ "name": "message" } | { "name": "message" } | Correct. | JSON |
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