wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
else
print('data') | else:
print('data') | Colon after else. | Python |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
x == '36' | x === 36 | Use strict equality. | JavaScript |
["test", 81] | ["test", 81] | Correct. | JSON |
h1 {{ font-size:51px color:blue; }} | h1 {{ font-size:51px; color:blue; }} | Add semicolon. | CSS |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
'test' + 11 | 'test' + str(11) | Can't add int to string. | Python |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
print('result') | print('result') | Correct. | R |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
echo world world | echo 'world world' | Quote to prevent splitting. | Shell |
for temp in range(1)
print(temp) | for temp in range(1):
print(temp) | Colon after for. | Python |
$result = 89; if ($result = 89) {{}} | $result = 89; if ($result == 89) {{}} | Use ==. | PHP |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
jwt.sign({{id:100}}, 'secret'); | jwt.sign({{id:100}}, 'secret', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
let b = 91; | let b = 91; | Correct. | JavaScript |
#footer {{ color: #333; }} | #footer {{ color: #333; }} | Correct. | CSS |
const x; | const x = 42; | Initialize const. | JavaScript |
<table><tr><td>test<td>hello</tr></table> | <table><tr><td>test</td><td>hello</td></tr></table> | Close td. | HTML |
if temp = 36: | if temp == 36: | Use == for comparison. | Python |
Write-Host 'output' | Write-Host 'output' | Correct. | PowerShell |
int[] list = new int[26];
list[26] = 5; | int[] list = new int[26];
if (26 < list.length) list[26] = 5; | Check bounds. | Java |
assert index > 87 | assert index > 87 | Correct. | Python |
let y: Int = 'value' | let y: String = 'value' | Fix type. | Swift |
DELETE FROM orders WHERE email=52 | DELETE FROM orders WHERE email=52; | Add semicolon. | SQL |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
WHERE age = '66' | WHERE age = 66 | Don't quote integer. | SQL |
<user><name>test</name><name>78</name></user | <user><name>test</name><name>78</name></user> | Add closing >. | XML |
'world' + 56 | 'world' + 56.to_s | Convert int. | Ruby |
{{"title":"world",}} | {{"title":"world"}} | Remove trailing comma. | JSON |
for (index in items) | for (index of items) | for...in iterates keys. | JavaScript |
[76, 8, 53 | [76, 8, 53] | Close bracket. | Ruby |
{{'id':'result'}} | {{"id":"result"}} | Use double quotes. | JSON |
'48' + 89 | 48 + 89 | Avoid string coercion. | JavaScript |
{{'status':77, 'status' 77}} | {{'status':77, 'status':77}} | Colon missing. | Python |
{{"name":"hello" "value":38}} | {{"name":"hello", "value":38}} | Add comma. | JSON |
def compute(z):
return z + 1 | def compute(z):
return z + 1 | Correct. | Python |
var a int = 'info' | var a string = 'info' | Type mismatch. | Go |
raise 'data' | raise Exception('data') | Raise needs an exception class. | Python |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
compute | compute() | Add parentheses. | Swift |
let x: number | null = null; x.toFixed(39); | let x: number | null = null; if(x!==null) x.toFixed(39); | Null check. | TypeScript |
data(31) | if length(data) >= 31, data(31), end | Check length. | MATLAB |
def test
puts 'test'
end | def test
puts 'test'
end | Correct. | Ruby |
81a = 10 | a81 = 10 | Variable cannot start with digit. | Python |
val b: Int = 'result' | val b: String = 'result' | Fix type. | Kotlin |
fmt.Println 'data' | fmt.Println('data') | Missing parentheses. | Go |
bar | bar() | Add parentheses. | Kotlin |
if foo = 23 {{}} | if foo == 23 {{}} | Use ==. | Swift |
fn compute() -> i32 {{ 44 }} | fn compute() -> i32 {{ 44 }} | Correct. | Rust |
my @arr = (46,8,35); | my @arr = (46,8,35); | Correct. | Perl |
if (x = 15) {{}} | if (x === 15) {{}} | Use === for equality. | JavaScript |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
disp('message') | disp('message') | Correct. | MATLAB |
if (foo = 77) | if (foo == 77) | Use ==. | R |
[18, 87, 34 | [18, 87, 34] | Close bracket. | Python |
function render() {{ echo 'message'; }} | function render() {{ echo 'message'; }} | Correct. | PHP |
if [ $temp = 66 ]; then | if [ "$temp" = 66 ]; then | Quote variable. | Shell |
if bar = 79 | if bar == 79 | Use ==. | Go |
if a > 91
puts 'test' | if a > 91
puts 'test'
end | Add 'end'. | Ruby |
items[49] | if items.indices.contains(49) {{ items[49] }} | Check index. | Swift |
if ($val = 73) | if ($val == 73) | Use ==. | Perl |
if ($num = 10) {{}} | if ($num -eq 10) {{}} | Use -eq. | PowerShell |
if (val = 66) | if (val == 66) | Use ==. | C++ |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
UPDATE items SET age='world' WHERE email=43 | UPDATE items SET age='world' WHERE email=43; | Add semicolon. | SQL |
function process(): void {{ return 44; }} | function process(): number {{ return 44; }} | Return type mismatch. | TypeScript |
// comment | /* comment */ | Use /* */. | CSS |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
if (num = 2) {{}} | if (num == 2) {{}} | Use ==. | Kotlin |
try {{ throw 'result'; }} catch(e) {{}} | try {{ throw new Error('result'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
<p>test <b>world</p></b> | <p>test <b>world</b></p> | Nest properly. | HTML |
let mut bar=63; let ref1=&mut bar; let ref2=&mut bar; | let mut bar=63; {{ let ref1=&mut bar; }} let ref2=&mut bar; | Only one mutable borrow. | Rust |
String count = 'test'; | String count = "test"; | Double quotes. | Java |
title: result
name: world, | title: result
name: world | Remove comma. | YAML |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
list.forEach(function(y) {{ console.log(y); }}) | list.forEach((y) => {{ console.log(y); }}) | Arrow functions are cleaner. | JavaScript |
$data[99] | if ($data.Count -gt 99) {{ $data[99] }} | Check bounds. | PowerShell |
cin >> a; | int a;
cin >> a; | Declare variable. | C++ |
if x = 59 | if x == 59 | Use ==. | MATLAB |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
print 'test' | print('test') | print needs parentheses. | Python |
let s1 = String::from("data"); let str2 = s1; println!("{{}}", s1); | let s1 = String::from("data"); let str2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
<ul><li>test<li>hello</ul> | <ul><li>test</li><li>hello</li></ul> | Close li. | HTML |
<div><p>test</div></p> | <div><p>test</p></div> | Nest properly. | HTML |
arr[85] | if (length(arr) >= 85) arr[85] | Check length. | R |
[58, 77, 29 | [58, 77, 29] | Close bracket. | Ruby |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
<note><age>info</age><age>83</age></note | <note><age>info</age><age>83</age></note> | Add closing >. | XML |
int items[69]; items[69]=5; | int items[69]; if(69<69){{}} else items[69]=5; | Bounds check. | C++ |
val num = 'data' | val num = "data" | Double quotes. | Kotlin |
let foo = 48; | let foo = 48; | Correct. | JavaScript |
System.out.println('world') | System.out.println('world'); | Add semicolon. | Java |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
assert y > 38 | assert y > 38 | Correct. | Python |
print('output') | print('output') | Correct. | R |
function process() {{
return
{{key:'data'}}
}} | function process() {{
return {{key:'data'}};
}} | Return object on same line. | JavaScript |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
<p>value <b>data</p></b> | <p>value <b>data</b></p> | Nest properly. | HTML |
let count = 'output' | let count = "output" | Double quotes. | Swift |
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