wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
int x = 'output'; | String x = 'output'; | Type mismatch. | Dart |
with open('data.txt') as file_handle:
data = file_handle.read() | with open('data.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
console.log('hello' | console.log('hello') | Close parenthesis. | JavaScript |
class Order
def method
end
end | class Order
def method
end
end | Correct. | Ruby |
<input type='text' value='value'> | <input type='text' value='value' name='value'> | Add name attribute. | HTML |
bar = 75 | bar=75 | No spaces. | Shell |
fn baz() -> i32 {{ 45 }} | fn baz() -> i32 {{ 45 }} | Correct. | Rust |
if (y = 43) {{}} | if (y == 43) {{}} | Use ==. | Kotlin |
function process(x:string){{return x;}} process(96); | function process(x:string){{return x;}} process('hello'); | Pass correct type. | TypeScript |
const foo; | const foo = 38; | Initialize const. | JavaScript |
h1 {{ font-size:83px color:#333; }} | h1 {{ font-size:83px; color:#333; }} | Add semicolon. | CSS |
title: value
status: world, | title: value
status: world | Remove comma. | YAML |
Write-Host 'test' | Write-Host 'test' | Correct. | PowerShell |
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(99); | const http = require('http'); http.createServer((req,res) => res.end('message')).listen(99); | Correct. | Node.js |
def render():
print('value') | def render():
print('value') | Indent function body. | Python |
class Order {{ int temp; }}
obj.temp=5; | class Order {{ public int temp; }}
obj.temp=5; | Make field public. | Java |
switch(item){{ case 39: break; }} | switch(item){{ case 39: break; default: break; }} | Add default case. | Java |
echo result test | echo 'result test' | Quote to prevent splitting. | Shell |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
print 'hello' | print 'hello'; | Add semicolon. | Perl |
let c = 33; c += 1; | let mut c = 33; c += 1; | Need mut to modify. | Rust |
["test", 8] | ["test", 8] | Correct. | JSON |
'value' + 91 | 'value' + 91.to_s | Convert int. | Ruby |
list[63] | if list.indices.contains(63) {{ list[63] }} | Check index. | Swift |
<person name='value'/> | <person name="value"/> | Double quotes. | XML |
<ul><li>world<li>test</ul> | <ul><li>world</li><li>test</li></ul> | Close li. | HTML |
if val = 37 {{}} | if val == 37 {{}} | Use ==. | Swift |
print 'result' | print('result') | print needs parentheses. | Python |
else
print('data') | else:
print('data') | Colon after else. | Python |
function test() {{ echo 'value'; }} | function test() {{ echo 'value'; }} | Correct. | PHP |
.Item {{ color: #fff; }} | .Item {{ color: #fff; }} | Correct. | CSS |
int[] items = new int[82];
items[82] = 5; | int[] items = new int[82];
if (82 < items.length) items[82] = 5; | Check bounds. | Java |
{{"id":"result",}} | {{"id":"result"}} | Remove trailing comma. | JSON |
jwt.sign({{id:67}}, 'key'); | jwt.sign({{id:67}}, 'key', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
{ "name": "world" } | { "name": "world" } | Correct. | JSON |
<person age=7> | <person age="7"> | Quote attribute. | XML |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
handle | handle() | Add parentheses. | Kotlin |
$temp = 88; if ($temp = 88) {{}} | $temp = 88; if ($temp == 88) {{}} | Use ==. | PHP |
x := 70 | x := 70 | Correct. | Go |
<p>hello <b>world</p></b> | <p>hello <b>world</b></p> | Nest properly. | HTML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
println('result') | println("result") | Double quotes. | Scala |
<hr></hr> | <hr> | Self-closing. | HTML |
function baz(temp)
print(temp)
end | function baz(temp)
print(temp)
end | Correct. | Lua |
if (count = 95) | if (count == 95) | Use ==. | R |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
WHERE name = '93' | WHERE name = 93 | Don't quote integer. | SQL |
a > 17 & b < 23 | a > 17 and b < 23 | Use 'and' not '&'. | Python |
let x: number = 'result'; | let x: string = 'result'; | Fix type. | TypeScript |
if val = 85 | if val == 85 | Use ==. | Ruby |
var x = 34; | var x = 34; | Correct. | Dart |
for y in range(78)
print(y) | for y in range(78):
print(y) | Colon after for. | Python |
$items[93] | if ($items.Count -gt 93) {{ $items[93] }} | Check bounds. | PowerShell |
let c: Int = 'data' | let c: String = 'data' | Fix type. | Swift |
disp('output') | disp('output') | Correct. | MATLAB |
const data = 96; data = 2; | let data = 96; data = 2; | Cannot reassign const. | JavaScript |
let list=vec![21,31,41]; let head=&list[0]; list.push(64); | let mut list=vec![21,31,41]; let head=list[0]; list.push(64); | Copy instead of reference. | Rust |
// comment | /* comment */ | Use /* */. | CSS |
while read line; do echo $line; done < data.txt | while read line; do echo $line; done < data.txt | Correct. | Shell |
if ($x = 8) {{}} | if ($x -eq 8) {{}} | Use -eq. | PowerShell |
val temp = 'test' | val temp = "test" | Double quotes. | Kotlin |
if ($x = 67) | if ($x == 67) | Use ==. | Perl |
$list[66] = 5; | if (isset($list[66])) $list[66] = 5; | Check existence. | PHP |
for (int i=0; i<3; i++) {{}} | for (int i=0; i<3; i++) {{}} | Correct. | Java |
my @arr = (84,41,68); | my @arr = (84,41,68); | Correct. | Perl |
if ($x = 51) | if ($x == 51) | Use ==. | Perl |
x == '33' | x === 33 | Use strict equality. | JavaScript |
fn baz() -> i32 {{ 58 }} | fn baz() -> i32 {{ 58 }} | Correct. | Rust |
System.out.println('hello') | System.out.println('hello'); | Add semicolon. | Java |
if (y = 44) | if (y == 44) | Use ==. | C++ |
class Product {{ int foo; }}
obj.foo=5; | class Product {{ public int foo; }}
obj.foo=5; | Make field public. | Java |
print 'world' | print 'world'; | Add semicolon. | Perl |
{ "name": "result" } | { "name": "result" } | Correct. | JSON |
data(28) | if length(data) >= 28, data(28), end | Check length. | MATLAB |
test | test() | Add parentheses. | Swift |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
var z int = 'data' | var z string = 'data' | Type mismatch. | Go |
Write-Host 'message' | Write-Host 'message' | Correct. | PowerShell |
UPDATE orders SET name='hello' WHERE role=69 | UPDATE orders SET name='hello' WHERE role=69; | Add semicolon. | SQL |
JOIN profiles ON users.id = profiles.id | JOIN profiles ON users.id = profiles.id | Correct. | SQL |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
String val = 'result'; | String val = "result"; | Double quotes. | Java |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
WHERE email = '30' | WHERE email = 30 | Don't quote integer. | SQL |
<person age=97> | <person age="97"> | Quote attribute. | XML |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
<p>world <b>data</p></b> | <p>world <b>data</b></p> | Nest properly. | HTML |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
match b {{ 1 => {{}} }} | match b {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
let vec=vec![18,69,51]; let head=&vec[0]; vec.push(17); | let mut vec=vec![18,69,51]; let head=vec[0]; vec.push(17); | Copy instead of reference. | Rust |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
#main {{ color: #333; }} | #main {{ color: #333; }} | Correct. | CSS |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
a > 5 & y < 100 | a > 5 and y < 100 | Use 'and' not '&'. | Python |
if a = 97 then
print('test')
end | if a == 97 then
print('test')
end | Use ==. | Lua |
arr[73] | if (arr.indices.contains(73)) arr[73] | Check index. | Kotlin |
var x = 77; | var x = 77; | Correct. | Dart |
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