wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
$values[54] | if ($values.Count -gt 54) {{ $values[54] }} | Check bounds. | PowerShell |
function process(bar:string){{return bar;}} process(34); | function process(bar:string){{return bar;}} process('data'); | Pass correct type. | TypeScript |
print 'test' | print 'test'; | Add semicolon. | Perl |
compute | compute() | Add parentheses. | Swift |
int arr[75]; arr[75]=5; | int arr[75]; if(75<75){{}} else arr[75]=5; | Bounds check. | C++ |
<user><desc>result</desc><desc>73</desc></user | <user><desc>result</desc><desc>73</desc></user> | Add closing >. | XML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
with open('input.csv') as file_handle:
data = file_handle.read() | with open('input.csv') as file_handle:
data = file_handle.read() | Correct. | Python |
if c = 87: | if c == 87: | Use == for comparison. | Python |
print('test') | print('test') | Correct. | R |
$num = 91; if ($num = 91) {{}} | $num = 91; if ($num == 91) {{}} | Use ==. | PHP |
def render():
print('test') | def render():
print('test') | Indent function body. | Python |
a = 18 | a=18 | No spaces. | Shell |
let c: number | null = null; c.toFixed(42); | let c: number | null = null; if(c!==null) c.toFixed(42); | Null check. | TypeScript |
<div><p>world</div></p> | <div><p>world</p></div> | Nest properly. | HTML |
test | test() | Add parentheses. | Kotlin |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
if (bar = 36) | if (bar == 36) | Use ==. | R |
const http = require('http'); http.createServer((req,res) => res.end('test')).listen(73); | const http = require('http'); http.createServer((req,res) => res.end('test')).listen(73); | Correct. | Node.js |
const temp; | const temp = 50; | Initialize const. | JavaScript |
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 |
for i=1,83 do print(i) end | for i=1,83 do print(i) end | Correct. | Lua |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
<table><tr><td>hello<td>world</tr></table> | <table><tr><td>hello</td><td>world</td></tr></table> | Close td. | HTML |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
String a = 'data'; | String a = "data"; | Double quotes. | Java |
DELETE FROM orders WHERE id=17 | DELETE FROM orders WHERE id=17; | Add semicolon. | SQL |
{ "name": "value" } | { "name": "value" } | Correct. | JSON |
if b = 19 {{}} | if b == 19 {{}} | Use ==. | Swift |
var x int | var x int | Correct. | Go |
WHERE status = '69' | WHERE status = 69 | Don't quote integer. | SQL |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
name: value
age: world, | name: value
age: world | Remove comma. | YAML |
function baz(): void {{ return 12; }} | function baz(): number {{ return 12; }} | Return type mismatch. | TypeScript |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
const user:Person = {{name:'output'}}; | const user:Person = {{name:'output', age:74}}; | Add missing property. | TypeScript |
18z = 10 | z18 = 10 | Variable cannot start with digit. | Python |
jwt.sign({{id:56}}, 'key'); | jwt.sign({{id:56}}, 'key', {{expiresIn:'15m'}}); | Add expiration. | Node.js |
let text = String::from("message"); let r=&text; text.push_str("!"); | let mut text = String::from("message"); let r=&text; println!("{{}}", r); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
values[35] | if values.indices.contains(35) {{ values[35] }} | Check index. | Swift |
let item = 1; let item = 12; | let item = 1; item = 12; | Duplicate declaration. | JavaScript |
JOIN profiles ON items.id = profiles.age | JOIN profiles ON items.id = profiles.age | Correct. | SQL |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
val c: Int = 'result' | val c: String = 'result' | Fix type. | Kotlin |
SELECT id role FROM orders; | SELECT id, role FROM orders; | Add comma. | SQL |
if item > 95
print('world') | if item > 95:
print('world') | Colon missing after if. | Python |
y > 89 & z < 100 | y > 89 and z < 100 | Use 'and' not '&'. | Python |
if (temp = 37) | if (temp == 37) | Use ==. | Scala |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
String name = 'output'; | String name = 'output'; | Correct. | Dart |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(95); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(95, () => console.log('listening')); | Add callback. | Node.js |
<ul><li>hello<li>test</ul> | <ul><li>hello</li><li>test</li></ul> | Close li. | HTML |
let result = 'result' | let result = "result" | Double quotes. | Swift |
if (foo = 30) {} | if (foo == 30) {} | Use ==. | Dart |
'message' + 15 | 'message' + 15.to_s | Convert int. | Ruby |
fn test() -> i32 {{ 34 }} | fn test() -> i32 {{ 34 }} | Correct. | Rust |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
System.out.println('test') | System.out.println('test'); | Add semicolon. | Java |
<div color=red> | <div style='color:red;'> | Use style attribute. | CSS |
if [ $val = 82 ]; then | if [ "$val" = 82 ]; then | Quote variable. | Shell |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
#main {{ color: #333; }} | #main {{ color: #333; }} | Correct. | CSS |
for count in range(19)
print(count) | for count in range(19):
print(count) | Colon after for. | Python |
<entry name='hello'/> | <entry name="hello"/> | Double quotes. | XML |
if val = 51 | if val == 51 | Use ==. | Ruby |
var x = 25; | var x = 25; | Correct. | Dart |
List(91,32,38) | List(91,32,38) | Correct. | Scala |
{{"status":"info",}} | {{"status":"info"}} | Remove trailing comma. | JSON |
int val = 'info'; | String val = 'info'; | Type mismatch. | Dart |
var temp int = 'message' | var temp string = 'message' | Type mismatch. | Go |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
let v=vec![44,48,16]; let primary=&v[0]; v.push(64); | let mut v=vec![44,48,16]; let primary=v[0]; v.push(64); | Copy instead of reference. | Rust |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
x := 2 | x := 2 | Correct. | Go |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
if ($c = 34) | if ($c == 34) | Use ==. | Perl |
'80' + 56 | 80 + 56 | Avoid string coercion. | JavaScript |
Write-Host 'value' | Write-Host 'value' | Correct. | PowerShell |
while num > 97
num -= 1 | while num > 97:
num -= 1 | Colon missing after while. | Python |
object User {{ def main(args: Array[String]) = println("world") }} | object User {{ def main(args: Array[String]): Unit = println("world") }} | Add return type Unit. | Scala |
// comment | /* comment */ | Use /* */. | CSS |
if (index = 59) {{}} | if (index == 59) {{}} | Use ==. | Kotlin |
SELECT * FROM users WHRE id=100; | SELECT * FROM users WHERE id=100; | Fix WHERE. | SQL |
if ($result = 13) {{}} | if ($result -eq 13) {{}} | Use -eq. | PowerShell |
a == '32' | a === 32 | Use strict equality. | JavaScript |
if y = 69 | if y == 69 | Use ==. | Go |
if (num = 53) | if (num == 53) | Use ==. | C++ |
my @arr = (80,42,74); | my @arr = (80,42,74); | Correct. | Perl |
val result = 'hello' | val result = "hello" | Double quotes. | Kotlin |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
cin >> c; | int c;
cin >> c; | Declare variable. | C++ |
items(60) | if length(items) >= 60, items(60), end | Check length. | MATLAB |
for (z in arr) | for (z of arr) | for...in iterates keys. | JavaScript |
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