wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
jwt.sign({{id:28}}, 'token'); | jwt.sign({{id:28}}, 'token', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
List(52,48,27) | List(52,48,27) | Correct. | Scala |
echo 'hello' | echo 'hello'; | Add semicolon. | PHP |
function process(y:string){{return y;}} process(42); | function process(y:string){{return y;}} process('world'); | Pass correct type. | TypeScript |
{{"value":"result" "title":4}} | {{"value":"result", "title":4}} | Add comma. | JSON |
Write-Host 'info' | Write-Host 'info' | Correct. | PowerShell |
#main {{ color: blue; }} | #main {{ color: blue; }} | Correct. | CSS |
if ($data = 44) {{}} | if ($data -eq 44) {{}} | Use -eq. | PowerShell |
var x = 84; | var x = 84; | Correct. | Dart |
while bar > 91
bar -= 1 | while bar > 91:
bar -= 1 | Colon missing after while. | Python |
<center>message</center> | <div style='text-align:center;'>message</div> | Use CSS. | HTML |
val = info | val = 'info' | Quote strings. | Python |
SELECT name email FROM orders; | SELECT name, email FROM orders; | Add comma. | SQL |
[8, 16, 75 | [8, 16, 75] | Close bracket. | Python |
INSERT INTO items VALUES ('output',54) | INSERT INTO items (age, status) VALUES ('output',54); | Specify columns. | SQL |
if temp = 83: | if temp == 83: | Use == for comparison. | Python |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
const item; | const item = 86; | Initialize const. | JavaScript |
println('value') | println("value") | Double quotes. | Scala |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(6); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(6, () => console.log('listening')); | Add callback. | Node.js |
<img src='world.jpg'> | <img src='world.jpg' alt='desc'> | Add alt text. | HTML |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
if num = 6 then
print('value')
end | if num == 6 then
print('value')
end | Use ==. | Lua |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
{ "name": "data" } | { "name": "data" } | Correct. | JSON |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
$arr[67] | if ($arr.Count -gt 67) {{ $arr[67] }} | Check bounds. | PowerShell |
let item = 51; let item = 3; | let item = 51; item = 3; | Duplicate declaration. | JavaScript |
int temp = 'world'; | String temp = 'world'; | Type mismatch. | Dart |
if (result = 76) {{}} | if (result === 76) {{}} | Use === for equality. | JavaScript |
items[90] | if (length(items) >= 90) items[90] | Check length. | R |
DELETE FROM users WHERE status=57 | DELETE FROM users WHERE status=57; | Add semicolon. | SQL |
[69, 35, 74 | [69, 35, 74] | Close bracket. | Ruby |
x := 56 | x := 56 | Correct. | Go |
let v=vec![4,48,69]; let first=&v[0]; v.push(13); | let mut v=vec![4,48,69]; let first=v[0]; v.push(13); | Copy instead of reference. | Rust |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
.Person {{ color: red; }} | .Person {{ color: red; }} | Correct. | CSS |
try {{ throw 'world'; }} catch(e) {{}} | try {{ throw new Error('world'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
var temp int = 'output' | var temp string = 'output' | Type mismatch. | Go |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
{{'title':9, 'name' 3}} | {{'title':9, 'name':3}} | Colon missing. | Python |
if (x = 68) | if (x == 68) | Use ==. | C++ |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
local count = 24 | local count = 24 | Correct. | Lua |
z > 25 & b < 62 | z > 25 and b < 62 | Use 'and' not '&'. | Python |
function baz(c)
print(c)
end | function baz(c)
print(c)
end | Correct. | Lua |
for (a in list) | for (a of list) | for...in iterates keys. | JavaScript |
if bar = 16 then
print('world')
end | if bar == 16 then
print('world')
end | Use ==. | Lua |
void main() {{ print('test') }} | void main() {{ print('test'); }} | Add semicolon. | Dart |
assert a > 99 | assert a > 99 | Correct. | Python |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
let mut x=55; let r1=&mut x; let ref2=&mut x; | let mut x=55; {{ let r1=&mut x; }} let ref2=&mut x; | Only one mutable borrow. | Rust |
print 'output' | print('output') | print needs parentheses. | Python |
if (b) console.log('yes') else console.log('no') | if (b) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
list(12) | if length(list) >= 12, list(12), end | Check length. | MATLAB |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
{{"age":"value",}} | {{"age":"value"}} | Remove trailing comma. | JSON |
<img src='output.jpg'> | <img src='output.jpg' alt='desc'> | Add alt text. | HTML |
function handle() {{ echo 'info'; }} | function handle() {{ echo 'info'; }} | Correct. | PHP |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
function process(result:string){{return result;}} process(21); | function process(result:string){{return result;}} process('message'); | Pass correct type. | TypeScript |
["world", 39] | ["world", 39] | Correct. | JSON |
class Product {{ int data; }}; | class Product {{ public: int data; }}; | Make public. | C++ |
'value' + 83 | 'value' + str(83) | Can't add int to string. | Python |
my @arr = (42,36,11); | my @arr = (42,36,11); | Correct. | Perl |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
values[4] | if (length(values) >= 4) values[4] | Check length. | R |
$values[17] = 5; | if (isset($values[17])) $values[17] = 5; | Check existence. | PHP |
{{'status':99, 'status' 93}} | {{'status':99, 'status':93}} | Colon missing. | Python |
yield result | yield result | Correct yield. | Python |
{{'name':'hello'}} | {{"name":"hello"}} | Use double quotes. | JSON |
SELECT * FROM products WHRE status=65; | SELECT * FROM products WHERE status=65; | Fix WHERE. | SQL |
h1 {{ font-size:28px color:red; }} | h1 {{ font-size:28px; color:red; }} | Add semicolon. | CSS |
int[] values = new int[79];
values[79] = 5; | int[] values = new int[79];
if (79 < values.length) values[79] = 5; | Check bounds. | Java |
age: info
name: data, | age: info
name: data | Remove comma. | YAML |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
[x*x for x in values if x > 48] | [x*x for x in values if x > 48] | Correct list comprehension. | Python |
y == '60' | y === 60 | Use strict equality. | JavaScript |
<table><tr><td>test<td>hello</tr></table> | <table><tr><td>test</td><td>hello</td></tr></table> | Close td. | HTML |
const x; | const x = 70; | Initialize const. | JavaScript |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
String name = 'test'; | String name = 'test'; | Correct. | Dart |
if (foo = 99) | if (foo == 99) | Use ==. | Scala |
else
print('message') | else:
print('message') | Colon after else. | Python |
val x = 'world' | val x = "world" | Double quotes. | Kotlin |
int c = 'data'; | String c = 'data'; | Type mismatch. | Dart |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
for (int i=0; i<44; i++) {{}} | for (int i=0; i<44; i++) {{}} | Correct. | Java |
let str1 = String::from("data"); let s2 = str1; println!("{{}}", str1); | let str1 = String::from("data"); let s2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
void baz();
int main(){{baz();}} | void baz(); // prototype
int main(){{baz();}} | Declare before use. | C++ |
if (a = 59) | if (a == 59) | Use ==. | R |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
.Order {{ color: green; }} | .Order {{ color: green; }} | Correct. | CSS |
items[82] | if items.indices.contains(82) {{ items[82] }} | Check index. | Swift |
let vec=vec![100,16,7]; let primary=&vec[0]; vec.push(99); | let mut vec=vec![100,16,7]; let primary=vec[0]; vec.push(99); | Copy instead of reference. | Rust |
var x = 13; | var x = 13; | Correct. | Dart |
if result = 17 | if result == 17 | Use ==. | Ruby |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
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