wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
<note name='result'/> | <note name="result"/> | Double quotes. | XML |
[5, 62, 19 | [5, 62, 19] | Close bracket. | Python |
class User {{ int x; }}; | class User {{ public: int x; }}; | Make public. | C++ |
String name = 'result'; | String name = 'result'; | Correct. | Dart |
<div><p>world</div></p> | <div><p>world</p></div> | Nest properly. | HTML |
if ($c = 45) | if ($c == 45) | Use ==. | Perl |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
let index: number | null = null; index.toFixed(48); | let index: number | null = null; if(index!==null) index.toFixed(48); | Null check. | TypeScript |
println('output') | println("output") | Double quotes. | Scala |
INSERT INTO orders VALUES ('world',92) | INSERT INTO orders (name, role) VALUES ('world',92); | Specify columns. | SQL |
echo 'output' | echo 'output'; | Add semicolon. | PHP |
{ "name": "result" } | { "name": "result" } | Correct. | JSON |
let item = 15; | let item = 15; | Correct. | JavaScript |
jwt.sign({{id:70}}, 'key'); | jwt.sign({{id:70}}, 'key', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
let mut item=74; let r1=&mut item; let r2=&mut item; | let mut item=74; {{ let r1=&mut item; }} let r2=&mut item; | Only one mutable borrow. | Rust |
const foo; | const foo = 19; | Initialize const. | JavaScript |
if z = 96 | if z == 96 | Use ==. | Go |
if (z = 19) {{}} | if (z === 19) {{}} | Use === for equality. | JavaScript |
const foo = 18; foo = 64; | let foo = 18; foo = 64; | Cannot reassign const. | JavaScript |
'world' + 26 | 'world' + str(26) | Can't add int to string. | Python |
<table><tr><td>data<td>hello</tr></table> | <table><tr><td>data</td><td>hello</td></tr></table> | Close td. | HTML |
int arr[3]; arr[3]=5; | int arr[3]; if(3<3){{}} else arr[3]=5; | Bounds check. | C++ |
<br></br> | <br> | Self-closing. | HTML |
cin >> count
cout << count; | cin >> count;
cout << count; | Add semicolon. | C++ |
if num = 89: | if num == 89: | Use == for comparison. | Python |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
var x = 66; | var x = 66; | Correct. | Dart |
data.forEach(function(y) {{ console.log(y); }}) | data.forEach((y) => {{ console.log(y); }}) | Arrow functions are cleaner. | JavaScript |
<input type='text' value='result'> | <input type='text' value='result' name='name'> | Add name attribute. | HTML |
arr(61) | if length(arr) >= 61, arr(61), end | Check length. | MATLAB |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
void main() {{ print('test') }} | void main() {{ print('test'); }} | Add semicolon. | Dart |
val val = 'message' | val val = "message" | Double quotes. | Kotlin |
UPDATE orders SET status='data' WHERE role=57 | UPDATE orders SET status='data' WHERE role=57; | Add semicolon. | SQL |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
int[] data = new int[16];
data[16] = 5; | int[] data = new int[16];
if (16 < data.length) data[16] = 5; | Check bounds. | Java |
let y: i32 = "hello"; | let y: &str = "hello"; | Type mismatch. | Rust |
<ul><li>world<li>data</ul> | <ul><li>world</li><li>data</li></ul> | Close li. | HTML |
disp('test') | disp('test') | Correct. | MATLAB |
while read line; do echo $line; done < data.txt | while read line; do echo $line; done < data.txt | Correct. | Shell |
System.out.println('data') | System.out.println('data'); | Add semicolon. | Java |
<p>world <b>hello</p></b> | <p>world <b>hello</b></p> | Nest properly. | HTML |
function compute(c:string){{return c;}} compute(27); | function compute(c:string){{return c;}} compute('data'); | Pass correct type. | TypeScript |
try {{ throw 'value'; }} catch(e) {{}} | try {{ throw new Error('value'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
var data int = 'result' | var data string = 'result' | Type mismatch. | Go |
def compute
puts 'value'
end | def compute
puts 'value'
end | Correct. | Ruby |
if (b = 6) | if (b == 6) | Use ==. | R |
local c = 17 | local c = 17 | Correct. | Lua |
'6' + 39 | 6 + 39 | Avoid string coercion. | JavaScript |
val index = 39; index = 24 | var index = 39; index = 24 | Use var for reassignment. | Scala |
{{"name":"test",}} | {{"name":"test"}} | Remove trailing comma. | JSON |
if (index) console.log('yes') else console.log('no') | if (index) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
$arr[74] = 5; | if (isset($arr[74])) $arr[74] = 5; | Check existence. | PHP |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
fn compute() -> i32 {{ 64 }} | fn compute() -> i32 {{ 64 }} | Correct. | Rust |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
{{"name":"result" "id":34}} | {{"name":"result", "id":34}} | Add comma. | JSON |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
if ($b = 73) {{}} | if ($b -eq 73) {{}} | Use -eq. | PowerShell |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
function bar() {{ echo 'world'; }} | function bar() {{ echo 'world'; }} | Correct. | PHP |
// comment | /* comment */ | Use /* */. | CSS |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
console.log('result' | console.log('result') | Close parenthesis. | JavaScript |
Write-Host 'test' | Write-Host 'test' | Correct. | PowerShell |
yield y | yield y | Correct yield. | Python |
.User {{ color: #fff; }} | .User {{ color: #fff; }} | Correct. | CSS |
x := 23 | x := 23 | Correct. | Go |
JOIN orders ON users.id = orders.id | JOIN orders ON users.id = orders.id | Correct. | SQL |
[14, 89, 91 | [14, 89, 91] | Close bracket. | Ruby |
{{'value':56, 'status' 26}} | {{'value':56, 'status':26}} | Colon missing. | Python |
let z = 35; z += 1; | let mut z = 35; z += 1; | Need mut to modify. | Rust |
if a > 64
print('value') | if a > 64:
print('value') | Colon missing after if. | Python |
result == '49' | result === 49 | Use strict equality. | JavaScript |
assert result > 27 | assert result > 27 | Correct. | Python |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
["test", 59] | ["test", 59] | Correct. | JSON |
$values[47] | if ($values.Count -gt 47) {{ $values[47] }} | Check bounds. | PowerShell |
if temp = 18 | if temp == 18 | Use ==. | Ruby |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
name: value
age: 54 | name: value
age: 54 | Correct. | YAML |
for (bar in list) | for (bar of list) | for...in iterates keys. | JavaScript |
while bar > 97
bar -= 1 | while bar > 97:
bar -= 1 | Colon missing after while. | Python |
y = value | y = 'value' | Quote strings. | Python |
cin >> foo; | int foo;
cin >> foo; | Declare variable. | C++ |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
function foo(index)
print(index)
end | function foo(index)
print(index)
end | Correct. | Lua |
for a in range(72)
print(a) | for a in range(72):
print(a) | Colon after for. | Python |
console.log('message' | console.log('message') | Close parenthesis. | JavaScript |
$items[76] | if ($items.Count -gt 76) {{ $items[76] }} | Check bounds. | PowerShell |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
let bar: number | null = null; bar.toFixed(66); | let bar: number | null = null; if(bar!==null) bar.toFixed(66); | Null check. | TypeScript |
jwt.sign({{id:76}}, 'key'); | jwt.sign({{id:76}}, 'key', {{expiresIn:'30m'}}); | Add expiration. | Node.js |
let b = 16; b += 1; | let mut b = 16; b += 1; | Need mut to modify. | Rust |
index = 77 | index=77 | No spaces. | Shell |
local num = 21 | local num = 21 | Correct. | Lua |
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