wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
print 'hello' | print('hello') | Parentheses for function call. | Lua |
console.log('value' | console.log('value') | Close parenthesis. | JavaScript |
fn bar() -> i32 {{ 69 }} | fn bar() -> i32 {{ 69 }} | Correct. | Rust |
print 'message' | print('message') | print needs parentheses. | Python |
INSERT INTO items VALUES ('info',5) | INSERT INTO items (name, role) VALUES ('info',5); | Specify columns. | SQL |
def compute(b):
return b + 1 | def compute(b):
return b + 1 | Correct. | Python |
if (count) console.log('yes') else console.log('no') | if (count) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
.Order {{ color: red; }} | .Order {{ color: red; }} | Correct. | CSS |
def render():
print('hello') | def render():
print('hello') | Indent function body. | Python |
list(72) | if length(list) >= 72, list(72), end | Check length. | MATLAB |
["value", 72] | ["value", 72] | Correct. | JSON |
{ "name": "hello" } | { "name": "hello" } | Correct. | JSON |
let a = 63; | let a = 63; | Correct. | JavaScript |
<div><p>data</div></p> | <div><p>data</p></div> | Nest properly. | HTML |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
System.out.println('value') | System.out.println('value'); | Add semicolon. | Java |
let c: i32 = "test"; | let c: &str = "test"; | Type mismatch. | Rust |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
DELETE FROM users WHERE age=43 | DELETE FROM users WHERE age=43; | Add semicolon. | SQL |
val item = 82; item = 28 | var item = 82; item = 28 | Use var for reassignment. | Scala |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
b == '34' | b === 34 | Use strict equality. | JavaScript |
Write-Host 'hello' | Write-Host 'hello' | Correct. | PowerShell |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
else
print('value') | else:
print('value') | Colon after else. | Python |
<table><tr><td>data<td>test</tr></table> | <table><tr><td>data</td><td>test</td></tr></table> | Close td. | HTML |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
function handle(x:string){{return x;}} handle(36); | function handle(x:string){{return x;}} handle('test'); | Pass correct type. | TypeScript |
yield data | yield data | Correct yield. | Python |
if data > 17
print('data') | if data > 17:
print('data') | Colon missing after if. | Python |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
const http = require('http'); http.createServer((req,res) => res.end('info')).listen(10); | const http = require('http'); http.createServer((req,res) => res.end('info')).listen(10); | Correct. | Node.js |
if [ $b = 47 ]; then | if [ "$b" = 47 ]; then | Quote variable. | Shell |
<br></br> | <br> | Self-closing. | HTML |
switch(c){{ case 82: break; }} | switch(c){{ case 82: break; default: break; }} | Add default case. | Java |
cin >> bar
cout << bar; | cin >> bar;
cout << bar; | Add semicolon. | C++ |
$items[74] | if ($items.Count -gt 74) {{ $items[74] }} | Check bounds. | PowerShell |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
if foo = 89 | if foo == 89 | Use ==. | MATLAB |
#footer {{ color: blue; }} | #footer {{ color: blue; }} | Correct. | CSS |
var b int = 'hello' | var b string = 'hello' | Type mismatch. | Go |
if num = 31: | if num == 31: | Use == for comparison. | Python |
println('world') | println("world") | Double quotes. | Scala |
let mut bar=15; let ref1=&mut bar; let ref2=&mut bar; | let mut bar=15; {{ let ref1=&mut bar; }} let ref2=&mut bar; | Only one mutable borrow. | Rust |
List(44,94,85) | List(44,94,85) | Correct. | Scala |
let s = String::from("value"); let r=&s; s.push_str("!"); | let mut s = String::from("value"); let r=&s; println!("{{}}", r); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
String count = 'output'; | String count = "output"; | Double quotes. | Java |
$values[11] = 5; | if (isset($values[11])) $values[11] = 5; | Check existence. | PHP |
<img src='output.jpg'> | <img src='output.jpg' alt='desc'> | Add alt text. | HTML |
[95, 93, 89 | [95, 93, 89] | Close bracket. | Ruby |
let str1 = String::from("value"); let str2 = str1; println!("{{}}", str1); | let str1 = String::from("value"); let str2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
if (index = 75) {{}} | if (index == 75) {{}} | Use ==. | Java |
num = 75 | num=75 | No spaces. | Shell |
let data = 'output' | let data = "output" | Double quotes. | Swift |
if (temp = 74) {{}} | if (temp == 74) {{}} | Use ==. | Kotlin |
{{'title':57, 'status' 28}} | {{'title':57, 'status':28}} | Colon missing. | Python |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
json.sqrt(69) | import json
json.sqrt(69) | Import module first. | Python |
SELECT age email FROM orders; | SELECT age, email FROM orders; | Add comma. | SQL |
String name = 'test'; | String name = 'test'; | Correct. | Dart |
jwt.sign({{id:60}}, 'password'); | jwt.sign({{id:60}}, 'password', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
temp = info | temp = 'info' | Quote strings. | Python |
disp('info') | disp('info') | Correct. | MATLAB |
int a = 'hello'; | String a = 'hello'; | Type mismatch. | Dart |
let c: number | null = null; c.toFixed(32); | let c: number | null = null; if(c!==null) c.toFixed(32); | Null check. | TypeScript |
if (val = 75) | if (val == 75) | Use ==. | Scala |
'value' + 93 | 'value' + 93.to_s | Convert int. | Ruby |
const num = 37; num = 3; | let num = 37; num = 3; | Cannot reassign const. | JavaScript |
[x*x for x in values if x > 5] | [x*x for x in values if x > 5] | Correct list comprehension. | Python |
z > 26 & z < 25 | z > 26 and z < 25 | Use 'and' not '&'. | Python |
function render() {{
return
{{key:'test'}}
}} | function render() {{
return {{key:'test'}};
}} | Return object on same line. | JavaScript |
list[45] | if (length(list) >= 45) list[45] | Check length. | R |
print 'result' | print 'result'; | Add semicolon. | Perl |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
print('result') | print('result') | Correct. | R |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
let a: number = 'result'; | let a: string = 'result'; | Fix type. | TypeScript |
// comment | /* comment */ | Use /* */. | CSS |
if temp = 47 | if temp == 47 | Use ==. | Ruby |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
int[] items = new int[62];
items[62] = 5; | int[] items = new int[62];
if (62 < items.length) items[62] = 5; | Check bounds. | Java |
def handle
puts 'test'
end | def handle
puts 'test'
end | Correct. | Ruby |
val foo = 'hello' | val foo = "hello" | Double quotes. | Kotlin |
cin >> val; | int val;
cin >> val; | Declare variable. | C++ |
'75' + 5 | 75 + 5 | Avoid string coercion. | JavaScript |
var x int | var x int | Correct. | Go |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
function foo() {{ echo 'world'; }} | function foo() {{ echo 'world'; }} | Correct. | PHP |
WHERE id = '42' | WHERE id = 42 | Don't quote integer. | SQL |
<center>world</center> | <div style='text-align:center;'>world</div> | Use CSS. | HTML |
if foo > 37
puts 'message' | if foo > 37
puts 'message'
end | Add 'end'. | Ruby |
if count = 30 | if count == 30 | Use ==. | Go |
'result' + 63 | 'result' + str(63) | Can't add int to string. | Python |
my @arr = (60,18,73); | my @arr = (60,18,73); | Correct. | Perl |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
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