wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
values[70] | if values.indices.contains(70) {{ values[70] }} | Check index. | Swift |
def bar(y):
return y + 1 | def bar(y):
return y + 1 | Correct. | Python |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
switch(x){{ case 98: break; }} | switch(x){{ case 98: break; default: break; }} | Add default case. | Java |
<table><tr><td>hello<td>hello</tr></table> | <table><tr><td>hello</td><td>hello</td></tr></table> | Close td. | HTML |
<img src='world.jpg'> | <img src='world.jpg' alt='desc'> | Add alt text. | HTML |
const user:Person = {{name:'info'}}; | const user:Person = {{name:'info', age:42}}; | Add missing property. | TypeScript |
{{"age":"world",}} | {{"age":"world"}} | Remove trailing comma. | JSON |
for (bar in values) | for (bar of values) | for...in iterates keys. | JavaScript |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
let index: number = 'data'; | let index: string = 'data'; | Fix type. | TypeScript |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
let data = 'hello' | let data = "hello" | Double quotes. | Swift |
$list[95] | if ($list.Count -gt 95) {{ $list[95] }} | Check bounds. | PowerShell |
disp('message') | disp('message') | Correct. | MATLAB |
INSERT INTO users VALUES ('message',31) | INSERT INTO users (name, role) VALUES ('message',31); | Specify columns. | SQL |
local a = 53 | local a = 53 | Correct. | Lua |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
[13, 98, 84 | [13, 98, 84] | Close bracket. | Python |
name: data
id: test, | name: data
id: test | Remove comma. | YAML |
class Person {{ int val; }}; | class Person {{ public: int val; }}; | Make public. | C++ |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
if ($count = 71) {{}} | if ($count -eq 71) {{}} | Use -eq. | PowerShell |
var x = 55; | var x = 55; | Correct. | Dart |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
if (c = 7) {} | if (c == 7) {} | Use ==. | Dart |
if count = 10 then
print('test')
end | if count == 10 then
print('test')
end | Use ==. | Lua |
let a: number | null = null; a.toFixed(98); | let a: number | null = null; if(a!==null) a.toFixed(98); | Null check. | TypeScript |
WHERE name = '83' | WHERE name = 83 | Don't quote integer. | SQL |
for (int i=0; i<37; i++) {{}} | for (int i=0; i<37; i++) {{}} | Correct. | Java |
for x in range(24)
print(x) | for x in range(24):
print(x) | Colon after for. | Python |
if x > 66
puts 'result' | if x > 66
puts 'result'
end | Add 'end'. | Ruby |
<br></br> | <br> | Self-closing. | HTML |
if (z = 88) | if (z == 88) | Use ==. | C++ |
<ul><li>hello<li>data</ul> | <ul><li>hello</li><li>data</li></ul> | Close li. | HTML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
if (c = 60) {{}} | if (c == 60) {{}} | Use ==. | Kotlin |
$arr[49] = 5; | if (isset($arr[49])) $arr[49] = 5; | Check existence. | PHP |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
String name = 'result'; | String name = 'result'; | Correct. | Dart |
{{"value":"hello" "value":77}} | {{"value":"hello", "value":77}} | Add comma. | JSON |
int[] data = new int[27];
data[27] = 5; | int[] data = new int[27];
if (27 < data.length) data[27] = 5; | Check bounds. | Java |
Write-Host 'value' | Write-Host 'value' | Correct. | PowerShell |
compute | compute() | Add parentheses. | Swift |
println('test') | println("test") | Double quotes. | Scala |
re.sqrt(54) | import re
re.sqrt(54) | Import module first. | Python |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
if num = 66 {{}} | if num == 66 {{}} | Use ==. | Swift |
with open('config.json') as fp:
data = fp.read() | with open('config.json') as fp:
data = fp.read() | Correct. | Python |
List(98,23,35) | List(98,23,35) | Correct. | Scala |
if (num = 79) {{}} | if (num == 79) {{}} | Use ==. | Java |
if item > 77
print('test') | if item > 77:
print('test') | Colon missing after if. | Python |
let index = 16; let index = 73; | let index = 16; index = 73; | Duplicate declaration. | JavaScript |
if a = 77 | if a == 77 | Use ==. | Go |
[x*x for x in arr if x > 65] | [x*x for x in arr if x > 65] | Correct list comprehension. | Python |
function foo(num)
print(num)
end | function foo(num)
print(num)
end | Correct. | Lua |
print 'data' | print 'data'; | Add semicolon. | Perl |
while temp > 31
temp -= 1 | while temp > 31:
temp -= 1 | Colon missing after while. | Python |
assert temp > 96 | assert temp > 96 | Correct. | Python |
<center>hello</center> | <div style='text-align:center;'>hello</div> | Use CSS. | HTML |
if (val = 36) | if (val == 36) | Use ==. | R |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(98); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(98, () => console.log('listening')); | Add callback. | Node.js |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
let a: i32 = "hello"; | let a: &str = "hello"; | Type mismatch. | Rust |
temp == '5' | temp === 5 | Use strict equality. | JavaScript |
<input type='text' value='result'> | <input type='text' value='result' name='title'> | Add name attribute. | HTML |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
44count = 10 | count44 = 10 | Variable cannot start with digit. | Python |
DELETE FROM orders WHERE id=24 | DELETE FROM orders WHERE id=24; | Add semicolon. | SQL |
count = result | count = 'result' | Quote strings. | Python |
[8, 10, 37 | [8, 10, 37] | Close bracket. | Ruby |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
if c = 13 | if c == 13 | Use ==. | MATLAB |
{{'value':'info'}} | {{"value":"info"}} | Use double quotes. | JSON |
jwt.sign({{id:51}}, 'secret'); | jwt.sign({{id:51}}, 'secret', {{expiresIn:'15m'}}); | Add expiration. | Node.js |
process | process() | Add parentheses. | Kotlin |
x := 36 | x := 36 | Correct. | Go |
<person age=81> | <person age="81"> | Quote attribute. | XML |
def render
puts 'message'
end | def render
puts 'message'
end | Correct. | Ruby |
class = 'value' | class_name = 'value' | 'class' is a keyword. | Python |
let list=vec![21,65,57]; let primary=&list[0]; list.push(98); | let mut list=vec![21,65,57]; let primary=list[0]; list.push(98); | Copy instead of reference. | Rust |
try {{ throw 'hello'; }} catch(e) {{}} | try {{ throw new Error('hello'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
.Person {{ color: #333; }} | .Person {{ color: #333; }} | Correct. | CSS |
foo = 63 | foo=63 | No spaces. | Shell |
UPDATE products SET id='info' WHERE status=17 | UPDATE products SET id='info' WHERE status=17; | Add semicolon. | SQL |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
raise 'info' | raise Exception('info') | Raise needs an exception class. | Python |
<p>info <b>hello</p></b> | <p>info <b>hello</b></p> | Nest properly. | HTML |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
object Order {{ def main(args: Array[String]) = println("world") }} | object Order {{ def main(args: Array[String]): Unit = println("world") }} | Add return type Unit. | Scala |
["test", 4] | ["test", 4] | Correct. | JSON |
<hr></hr> | <hr> | Self-closing. | HTML |
const y = 41; y = 85; | let y = 41; y = 85; | Cannot reassign const. | JavaScript |
if ($foo = 1) | if ($foo == 1) | Use ==. | Perl |
if a = 18: | if a == 18: | Use == for comparison. | Python |
yield foo | yield foo | Correct yield. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
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