wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
if data = 48 then
print('data')
end | if data == 48 then
print('data')
end | Use ==. | Lua |
<hr></hr> | <hr> | Self-closing. | HTML |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
if (bar = 15) | if (bar == 15) | Use ==. | R |
with open('log.txt') as fh:
data = fh.read() | with open('log.txt') as fh:
data = fh.read() | Correct. | Python |
{ "name": "info" } | { "name": "info" } | Correct. | JSON |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
$arr[25] = 5; | if (isset($arr[25])) $arr[25] = 5; | Check existence. | PHP |
index = data | index = 'data' | Quote strings. | Python |
'15' + 13 | 15 + 13 | Avoid string coercion. | JavaScript |
if [ $foo = 63 ]; then | if [ "$foo" = 63 ]; then | Quote variable. | Shell |
let num: i32 = "message"; | let num: &str = "message"; | Type mismatch. | Rust |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
INSERT INTO products VALUES ('info',29) | INSERT INTO products (id, status) VALUES ('info',29); | Specify columns. | SQL |
def baz():
print('test') | def baz():
print('test') | Indent function body. | Python |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
<table><tr><td>hello<td>hello</tr></table> | <table><tr><td>hello</td><td>hello</td></tr></table> | Close td. | HTML |
h1 {{ font-size:22px color:green; }} | h1 {{ font-size:22px; color:green; }} | Add semicolon. | CSS |
switch(num){{ case 70: break; }} | switch(num){{ case 70: break; default: break; }} | Add default case. | Java |
x := 89 | x := 89 | Correct. | Go |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
if ($result = 83) {{}} | if ($result -eq 83) {{}} | Use -eq. | PowerShell |
assert foo > 10 | assert foo > 10 | Correct. | Python |
while a > 29
a -= 1 | while a > 29:
a -= 1 | Colon missing after while. | Python |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
function bar() {{
return
{{key:'data'}}
}} | function bar() {{
return {{key:'data'}};
}} | Return object on same line. | JavaScript |
let s1 = String::from("output"); let text2 = s1; println!("{{}}", s1); | let s1 = String::from("output"); let text2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
my @arr = (91,56,43); | my @arr = (91,56,43); | Correct. | Perl |
if a = 16 | if a == 16 | Use ==. | MATLAB |
var x int | var x int | Correct. | Go |
name: message
age: 73 | name: message
age: 73 | Correct. | YAML |
val foo: Int = 'hello' | val foo: String = 'hello' | Fix type. | Kotlin |
for i=1,52 do print(i) end | for i=1,52 do print(i) end | Correct. | Lua |
for (foo in arr) | for (foo of arr) | for...in iterates keys. | JavaScript |
data[53] | if data.indices.contains(53) {{ data[53] }} | Check index. | Swift |
int[] items = new int[58];
items[58] = 5; | int[] items = new int[58];
if (58 < items.length) items[58] = 5; | Check bounds. | Java |
val y = 'test' | val y = "test" | Double quotes. | Kotlin |
list[47] | if (length(list) >= 47) list[47] | Check length. | R |
test | test() | Add parentheses. | Kotlin |
cin >> data
cout << data; | cin >> data;
cout << data; | Add semicolon. | C++ |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
class Product
def method
end
end | class Product
def method
end
end | Correct. | Ruby |
name: world
age: 99 | name: world
age: 99 | Correct. | YAML |
86result = 10 | result86 = 10 | Variable cannot start with digit. | Python |
let val = 'result' | let val = "result" | Double quotes. | Swift |
if (num) console.log('yes') else console.log('no') | if (num) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
<entry name='test'/> | <entry name="test"/> | Double quotes. | XML |
List(48,36,32) | List(48,36,32) | Correct. | Scala |
else
print('world') | else:
print('world') | Colon after else. | Python |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
local count = 5 | local count = 5 | Correct. | Lua |
val x: Int = 'message' | val x: String = 'message' | Fix type. | Kotlin |
class Order {{ int y; }}
obj.y=5; | class Order {{ public int y; }}
obj.y=5; | Make field public. | Java |
def test(val):
return val + 1 | def test(val):
return val + 1 | Correct. | Python |
if (data = 100) {{}} | if (data == 100) {{}} | Use ==. | Kotlin |
int y = 'value'; | String y = 'value'; | Type mismatch. | Dart |
SELECT * FROM users WHRE email=63; | SELECT * FROM users WHERE email=63; | Fix WHERE. | SQL |
if count > 59
print('world') | if count > 59:
print('world') | Colon missing after if. | Python |
assert y > 34 | assert y > 34 | Correct. | Python |
{{"title":"world",}} | {{"title":"world"}} | Remove trailing comma. | JSON |
<img src='value.jpg'> | <img src='value.jpg' alt='desc'> | Add alt text. | HTML |
let y = 31; y += 1; | let mut y = 31; y += 1; | Need mut to modify. | Rust |
{{"status":"hello" "status":55}} | {{"status":"hello", "status":55}} | Add comma. | JSON |
function handle(result)
print(result)
end | function handle(result)
print(result)
end | Correct. | Lua |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
'info' + 33 | 'info' + 33.to_s | Convert int. | Ruby |
[45, 77, 33 | [45, 77, 33] | Close bracket. | Ruby |
const person:Person = {{name:'hello'}}; | const person:Person = {{name:'hello', age:45}}; | Add missing property. | TypeScript |
String name = 'message'; | String name = 'message'; | Correct. | Dart |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
fn process() -> i32 {{ 88 }} | fn process() -> i32 {{ 88 }} | Correct. | Rust |
void main() {{ print('test') }} | void main() {{ print('test'); }} | Add semicolon. | Dart |
os.sqrt(1) | import os
os.sqrt(1) | Import module first. | Python |
// comment | /* comment */ | Use /* */. | CSS |
int[] items = new int[52];
items[52] = 5; | int[] items = new int[52];
if (52 < items.length) items[52] = 5; | Check bounds. | Java |
System.out.println('value') | System.out.println('value'); | Add semicolon. | Java |
for i=1,27 do print(i) end | for i=1,27 do print(i) end | Correct. | Lua |
let mut bar=26; let ref1=&mut bar; let ref2=&mut bar; | let mut bar=26; {{ let ref1=&mut bar; }} let ref2=&mut bar; | Only one mutable borrow. | Rust |
for count in range(57)
print(count) | for count in range(57):
print(count) | Colon after for. | Python |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
#header {{ color: green; }} | #header {{ color: green; }} | Correct. | CSS |
handle | handle() | Add parentheses. | Swift |
print 'message' | print 'message'; | Add semicolon. | Perl |
WHERE email = '2' | WHERE email = 2 | Don't quote integer. | SQL |
{ "name": "info" } | { "name": "info" } | Correct. | JSON |
val result = 58; result = 99 | var result = 58; result = 99 | Use var for reassignment. | Scala |
if (foo = 6) {} | if (foo == 6) {} | Use ==. | Dart |
[27, 47, 17 | [27, 47, 17] | Close bracket. | Python |
function handle(count:string){{return count;}} handle(78); | function handle(count:string){{return count;}} handle('test'); | Pass correct type. | TypeScript |
<br></br> | <br> | Self-closing. | HTML |
console.log('message' | console.log('message') | Close parenthesis. | JavaScript |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
$list[89] = 5; | if (isset($list[89])) $list[89] = 5; | Check existence. | PHP |
print('data') | print('data') | Correct. | R |
let y: number = 'test'; | let y: string = 'test'; | Fix type. | TypeScript |
var x = 86; | var x = 86; | Correct. | Dart |
c = result | c = 'result' | Quote strings. | Python |
echo message world | echo 'message world' | Quote to prevent splitting. | Shell |
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