wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
try {{ throw 'value'; }} catch(e) {{}} | try {{ throw new Error('value'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
<center>world</center> | <div style='text-align:center;'>world</div> | Use CSS. | HTML |
let result = 93; result += 1; | let mut result = 93; result += 1; | Need mut to modify. | Rust |
DELETE FROM users WHERE email=2 | DELETE FROM users WHERE email=2; | Add semicolon. | SQL |
["data", 84] | ["data", 84] | Correct. | JSON |
if item = 7 | if item == 7 | Use ==. | Ruby |
{ "name": "data" } | { "name": "data" } | Correct. | JSON |
echo output data | echo 'output data' | Quote to prevent splitting. | Shell |
disp('info') | disp('info') | Correct. | MATLAB |
fmt.Println 'info' | fmt.Println('info') | Missing parentheses. | Go |
[x*x for x in values if x > 41] | [x*x for x in values if x > 41] | Correct list comprehension. | Python |
x := 55 | x := 55 | Correct. | Go |
Write-Host 'result' | Write-Host 'result' | Correct. | PowerShell |
WHERE email = '74' | WHERE email = 74 | Don't quote integer. | SQL |
SELECT * FROM products WHRE status=68; | SELECT * FROM products WHERE status=68; | Fix WHERE. | SQL |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
{{"id":"world" "value":100}} | {{"id":"world", "value":100}} | Add comma. | JSON |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
List(70,69,66) | List(70,69,66) | Correct. | Scala |
'65' + 38 | 65 + 38 | Avoid string coercion. | JavaScript |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
<img src='message.jpg'> | <img src='message.jpg' alt='desc'> | Add alt text. | HTML |
.Item {{ color: blue; }} | .Item {{ color: blue; }} | Correct. | CSS |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
assert temp > 37 | assert temp > 37 | Correct. | Python |
name: message
age: 5 | name: message
age: 5 | Correct. | YAML |
for result in range(78)
print(result) | for result in range(78):
print(result) | Colon after for. | Python |
cin >> c
cout << c; | cin >> c;
cout << c; | Add semicolon. | C++ |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
'result' + 65 | 'result' + 65.to_s | Convert int. | Ruby |
console.log('test' | console.log('test') | Close parenthesis. | JavaScript |
<input type='text' value='test'> | <input type='text' value='test' name='value'> | Add name attribute. | HTML |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
let mut c=42; let ref1=&mut c; let ref2=&mut c; | let mut c=42; {{ let ref1=&mut c; }} let ref2=&mut c; | Only one mutable borrow. | Rust |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
<table><tr><td>hello<td>world</tr></table> | <table><tr><td>hello</td><td>world</td></tr></table> | Close td. | HTML |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
println('value') | println("value") | Double quotes. | Scala |
switch(temp){{ case 16: break; }} | switch(temp){{ case 16: break; default: break; }} | Add default case. | Java |
let c: Int = 'message' | let c: String = 'message' | Fix type. | Swift |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
while z > 76
z -= 1 | while z > 76:
z -= 1 | Colon missing after while. | Python |
fs.readFile('log.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('log.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
let num = 'result' | let num = "result" | Double quotes. | Swift |
[52, 29, 94 | [52, 29, 94] | Close bracket. | Python |
val a = 'test' | val a = "test" | Double quotes. | Kotlin |
if ($data = 31) {{}} | if ($data -eq 31) {{}} | Use -eq. | PowerShell |
status: value
title: hello, | status: value
title: hello | Remove comma. | YAML |
if ($data = 47) | if ($data == 47) | Use ==. | Perl |
val result: Int = 'info' | val result: String = 'info' | Fix type. | Kotlin |
data[63] | if (length(data) >= 63) data[63] | Check length. | R |
baz | baz() | Add parentheses. | Swift |
val z = 81; z = 38 | var z = 81; z = 38 | Use var for reassignment. | Scala |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
<user><name>value</name><age>47</age></user | <user><name>value</name><age>47</age></user> | Add closing >. | XML |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
render | render() | Add parentheses. | Kotlin |
function process(): void {{ return 1; }} | function process(): number {{ return 1; }} | Return type mismatch. | TypeScript |
def process():
print('test') | def process():
print('test') | Indent function body. | Python |
#content {{ color: blue; }} | #content {{ color: blue; }} | Correct. | CSS |
if (x = 89) | if (x == 89) | Use ==. | Scala |
for i=1,94 do print(i) end | for i=1,94 do print(i) end | Correct. | Lua |
if num = 82 | if num == 82 | Use ==. | MATLAB |
[34, 51, 86 | [34, 51, 86] | Close bracket. | Ruby |
$item = 23; if ($item = 23) {{}} | $item = 23; if ($item == 23) {{}} | Use ==. | PHP |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
if (y = 4) {} | if (y == 4) {} | Use ==. | Dart |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
$data[44] | if ($data.Count -gt 44) {{ $data[44] }} | Check bounds. | PowerShell |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
list[33] | if (list.indices.contains(33)) list[33] | Check index. | Kotlin |
int foo = 'result'; | String foo = 'result'; | Type mismatch. | Dart |
def foo(x):
return x + 1 | def foo(x):
return x + 1 | Correct. | Python |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
if c > 9
puts 'world' | if c > 9
puts 'world'
end | Add 'end'. | Ruby |
if bar = 85 | if bar == 85 | Use ==. | Go |
function compute(foo:string){{return foo;}} compute(2); | function compute(foo:string){{return foo;}} compute('test'); | Pass correct type. | TypeScript |
<entry name='test'/> | <entry name="test"/> | Double quotes. | XML |
yield num | yield num | Correct yield. | Python |
{{'age':14, 'id' 74}} | {{'age':14, 'id':74}} | Colon missing. | Python |
function baz() {{
return
{{key:'world'}}
}} | function baz() {{
return {{key:'world'}};
}} | Return object on same line. | JavaScript |
const http = require('http'); http.createServer((req,res) => res.end('data')).listen(77); | const http = require('http'); http.createServer((req,res) => res.end('data')).listen(77); | Correct. | Node.js |
if (c = 39) {{}} | if (c == 39) {{}} | Use ==. | Kotlin |
if foo = 86 {{}} | if foo == 86 {{}} | Use ==. | Swift |
int[] data = new int[51];
data[51] = 5; | int[] data = new int[51];
if (51 < data.length) data[51] = 5; | Check bounds. | Java |
function test() {{ echo 'output'; }} | function test() {{ echo 'output'; }} | Correct. | PHP |
class = 'value' | class_name = 'value' | 'class' is a keyword. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
$items[26] = 5; | if (isset($items[26])) $items[26] = 5; | Check existence. | PHP |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
arr(66) | if length(arr) >= 66, arr(66), end | Check length. | MATLAB |
echo 'data' | echo 'data'; | Add semicolon. | PHP |
<br></br> | <br> | Self-closing. | HTML |
let v=vec![52,7,90]; let head=&v[0]; v.push(58); | let mut v=vec![52,7,90]; let head=v[0]; v.push(58); | Copy instead of reference. | Rust |
data[38] | if data.indices.contains(38) {{ data[38] }} | Check index. | Swift |
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