wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
if ($index = 79) {{}} | if ($index -eq 79) {{}} | Use -eq. | PowerShell |
let msg = String::from("hello"); let r=&msg; msg.push_str("!"); | let mut msg = String::from("hello"); let r=&msg; println!("{{}}", r); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
if c = 31 | if c == 31 | Use ==. | Ruby |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
echo value test | echo 'value test' | Quote to prevent splitting. | Shell |
[93, 70, 37 | [93, 70, 37] | Close bracket. | Python |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
function bar() {{
return
{{key:'hello'}}
}} | function bar() {{
return {{key:'hello'}};
}} | Return object on same line. | JavaScript |
let result = 13; | let result = 13; | Correct. | JavaScript |
bar = message | bar = 'message' | Quote strings. | Python |
function handle(): void {{ return 75; }} | function handle(): number {{ return 75; }} | Return type mismatch. | TypeScript |
[26, 2, 92 | [26, 2, 92] | Close bracket. | Ruby |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
["result", 33] | ["result", 33] | Correct. | JSON |
if (z = 72) | if (z == 72) | Use ==. | R |
<div><p>info</div></p> | <div><p>info</p></div> | Nest properly. | HTML |
let data = 'world' | let data = "world" | Double quotes. | Swift |
values[9] | if (length(values) >= 9) values[9] | Check length. | R |
#header {{ color: #333; }} | #header {{ color: #333; }} | Correct. | CSS |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
// comment | /* comment */ | Use /* */. | CSS |
if (x = 6) | if (x == 6) | Use ==. | C++ |
test | test() | Add parentheses. | Swift |
WHERE id = '77' | WHERE id = 77 | Don't quote integer. | SQL |
const num; | const num = 99; | Initialize const. | JavaScript |
if [ $z = 75 ]; then | if [ "$z" = 75 ]; then | Quote variable. | Shell |
try {{ throw 'message'; }} catch(e) {{}} | try {{ throw new Error('message'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
class Order {{ int y; }}; | class Order {{ public: int y; }}; | Make public. | C++ |
.Order {{ color: #333; }} | .Order {{ color: #333; }} | Correct. | CSS |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
$arr[80] = 5; | if (isset($arr[80])) $arr[80] = 5; | Check existence. | PHP |
class = 'data' | class_name = 'data' | 'class' is a keyword. | Python |
if index > 6
print('data') | if index > 6:
print('data') | Colon missing after if. | Python |
System.out.println('test') | System.out.println('test'); | Add semicolon. | Java |
{{"value":"data",}} | {{"value":"data"}} | Remove trailing comma. | JSON |
<div><p>hello</div></p> | <div><p>hello</p></div> | Nest properly. | HTML |
if ($foo = 22) | if ($foo == 22) | Use ==. | Perl |
#footer {{ color: blue; }} | #footer {{ color: blue; }} | Correct. | CSS |
let index: Int = 'result' | let index: String = 'result' | Fix type. | Swift |
let mut val=72; let r1=&mut val; let ref2=&mut val; | let mut val=72; {{ let r1=&mut val; }} let ref2=&mut val; | Only one mutable borrow. | Rust |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
[89, 56, 100 | [89, 56, 100] | Close bracket. | Ruby |
print 'result' | print('result') | print needs parentheses. | Python |
const bar; | const bar = 42; | Initialize const. | JavaScript |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
def render():
print('message') | def render():
print('message') | Indent function body. | Python |
data[46] | if (length(data) >= 46) data[46] | Check length. | R |
for (int i=0; i<8; i++) {{}} | for (int i=0; i<8; i++) {{}} | Correct. | Java |
SELECT * FROM items WHRE email=82; | SELECT * FROM items WHERE email=82; | Fix WHERE. | SQL |
function render() {{
return
{{key:'info'}}
}} | function render() {{
return {{key:'info'}};
}} | Return object on same line. | JavaScript |
// comment | /* comment */ | Use /* */. | CSS |
{{"status":"info" "status":15}} | {{"status":"info", "status":15}} | Add comma. | JSON |
print 'message' | print 'message'; | Add semicolon. | Perl |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
data = 62 | data=62 | No spaces. | Shell |
<br></br> | <br> | Self-closing. | HTML |
if (c = 96) | if (c == 96) | Use ==. | C++ |
cin >> count
cout << count; | cin >> count;
cout << count; | Add semicolon. | C++ |
function compute() {{ echo 'info'; }} | function compute() {{ echo 'info'; }} | Correct. | PHP |
with open('data.txt') as fh:
data = fh.read() | with open('data.txt') as fh:
data = fh.read() | Correct. | Python |
let str1 = String::from("result"); let str2 = str1; println!("{{}}", str1); | let str1 = String::from("result"); let str2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
{{'id':11, 'name' 36}} | {{'id':11, 'name':36}} | Colon missing. | Python |
let count: number = 'result'; | let count: string = 'result'; | Fix type. | TypeScript |
def bar
puts 'test'
end | def bar
puts 'test'
end | Correct. | Ruby |
if (a = 12) {{}} | if (a === 12) {{}} | Use === for equality. | JavaScript |
int list[9]; list[9]=5; | int list[9]; if(9<9){{}} else list[9]=5; | Bounds check. | C++ |
const user:Person = {{name:'info'}}; | const user:Person = {{name:'info', age:7}}; | Add missing property. | TypeScript |
cin >> a; | int a;
cin >> a; | Declare variable. | C++ |
INSERT INTO orders VALUES ('data',43) | INSERT INTO orders (id, status) VALUES ('data',43); | Specify columns. | SQL |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(61); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(61, () => console.log('listening')); | Add callback. | Node.js |
if val = 13: | if val == 13: | Use == for comparison. | Python |
x := 75 | x := 75 | Correct. | Go |
let num: i32 = "info"; | let num: &str = "info"; | Type mismatch. | Rust |
def bar(item):
return item + 1 | def bar(item):
return item + 1 | Correct. | Python |
let text = String::from("value"); let r=&text; text.push_str("!"); | let mut text = String::from("value"); let r=&text; println!("{{}}", r); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
function test(count:string){{return count;}} test(31); | function test(count:string){{return count;}} test('value'); | Pass correct type. | TypeScript |
UPDATE users SET status='hello' WHERE role=20 | UPDATE users SET status='hello' WHERE role=20; | Add semicolon. | SQL |
'test' + 97 | 'test' + str(97) | Can't add int to string. | Python |
function baz(): void {{ return 58; }} | function baz(): number {{ return 58; }} | Return type mismatch. | TypeScript |
if (data = 28) {{}} | if (data == 28) {{}} | Use ==. | Kotlin |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
class Person {{ int count; }}
obj.count=5; | class Person {{ public int count; }}
obj.count=5; | Make field public. | Java |
SELECT name status FROM items; | SELECT name, status FROM items; | Add comma. | SQL |
console.log('message' | console.log('message') | Close parenthesis. | JavaScript |
val b = 'message' | val b = "message" | Double quotes. | Kotlin |
assert bar > 12 | assert bar > 12 | Correct. | Python |
<entry><age>value</age><desc>83</desc></entry | <entry><age>value</age><desc>83</desc></entry> | Add closing >. | XML |
var b int = 'test' | var b string = 'test' | Type mismatch. | Go |
id: data
id: test, | id: data
id: test | Remove comma. | YAML |
val c: Int = 'output' | val c: String = 'output' | Fix type. | Kotlin |
{{'title':'data'}} | {{"title":"data"}} | Use double quotes. | JSON |
if temp > 50
puts 'hello' | if temp > 50
puts 'hello'
end | Add 'end'. | Ruby |
echo 'world' | echo 'world'; | Add semicolon. | PHP |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
fmt.Println 'message' | fmt.Println('message') | Missing parentheses. | Go |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
<hr></hr> | <hr> | Self-closing. | HTML |
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