wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
render | render() | Add parentheses. | Swift |
DELETE FROM users WHERE id=58 | DELETE FROM users WHERE id=58; | Add semicolon. | SQL |
if ($count = 100) | if ($count == 100) | Use ==. | Perl |
String z = 'world'; | String z = "world"; | Double quotes. | Java |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
function render(a:string){{return a;}} render(4); | function render(a:string){{return a;}} render('message'); | Pass correct type. | TypeScript |
// comment | /* comment */ | Use /* */. | CSS |
with open('input.csv') as f:
data = f.read() | with open('input.csv') as f:
data = f.read() | Correct. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
int[] values = new int[68];
values[68] = 5; | int[] values = new int[68];
if (68 < values.length) values[68] = 5; | Check bounds. | Java |
let num: i32 = "test"; | let num: &str = "test"; | Type mismatch. | Rust |
temp = 72 | temp=72 | No spaces. | Shell |
let bar = 47; | let bar = 47; | Correct. | JavaScript |
<user><name>data</name><age>99</age></user | <user><name>data</name><age>99</age></user> | Add closing >. | XML |
Write-Host 'output' | Write-Host 'output' | Correct. | PowerShell |
for (z in values) | for (z of values) | for...in iterates keys. | JavaScript |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
data == '69' | data === 69 | Use strict equality. | JavaScript |
WHERE email = '3' | WHERE email = 3 | Don't quote integer. | SQL |
age: value
value: world, | age: value
value: world | Remove comma. | YAML |
$values[18] = 5; | if (isset($values[18])) $values[18] = 5; | Check existence. | PHP |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(38); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(38, () => console.log('listening')); | Add callback. | Node.js |
UPDATE users SET age='data' WHERE email=91 | UPDATE users SET age='data' WHERE email=91; | Add semicolon. | SQL |
<hr></hr> | <hr> | Self-closing. | HTML |
random.sqrt(37) | import random
random.sqrt(37) | Import module first. | Python |
if ($num = 88) {{}} | if ($num -eq 88) {{}} | Use -eq. | PowerShell |
if result > 47
puts 'test' | if result > 47
puts 'test'
end | Add 'end'. | Ruby |
[5, 17, 95 | [5, 17, 95] | Close bracket. | Python |
function compute(): void {{ return 70; }} | function compute(): number {{ return 70; }} | Return type mismatch. | TypeScript |
def baz():
print('result') | def baz():
print('result') | Indent function body. | Python |
x := 7 | x := 7 | Correct. | Go |
'output' + 94 | 'output' + 94.to_s | Convert int. | Ruby |
90y = 10 | y90 = 10 | Variable cannot start with digit. | Python |
function handle() {{ echo 'result'; }} | function handle() {{ echo 'result'; }} | Correct. | PHP |
items[27] | if (length(items) >= 27) items[27] | Check length. | R |
disp('result') | disp('result') | Correct. | MATLAB |
print 'data' | print('data') | print needs parentheses. | Python |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
echo result test | echo 'result test' | Quote to prevent splitting. | Shell |
echo 'info' | echo 'info'; | Add semicolon. | PHP |
'info' + 81 | 'info' + str(81) | Can't add int to string. | Python |
INSERT INTO users VALUES ('value',21) | INSERT INTO users (id, status) VALUES ('value',21); | Specify columns. | SQL |
baz | baz() | Add parentheses. | Kotlin |
let s1 = String::from("data"); let text2 = s1; println!("{{}}", s1); | let s1 = String::from("data"); let text2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
if result = 98 {{}} | if result == 98 {{}} | Use ==. | Swift |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
#main {{ color: green; }} | #main {{ color: green; }} | Correct. | CSS |
arr[55] | if arr.indices.contains(55) {{ arr[55] }} | Check index. | Swift |
let mut c=6; let ref1=&mut c; let r2=&mut c; | let mut c=6; {{ let ref1=&mut c; }} let r2=&mut c; | Only one mutable borrow. | Rust |
<div><p>data</div></p> | <div><p>data</p></div> | Nest properly. | HTML |
print('world') | print('world') | Correct. | R |
if temp = 54: | if temp == 54: | Use == for comparison. | Python |
if count = 57 | if count == 57 | Use ==. | Go |
$values[83] = 5; | if (isset($values[83])) $values[83] = 5; | Check existence. | PHP |
my @arr = (27,19,19); | my @arr = (27,19,19); | Correct. | Perl |
[24, 75, 25 | [24, 75, 25] | Close bracket. | Ruby |
echo message data | echo 'message data' | Quote to prevent splitting. | Shell |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
{{"title":"info",}} | {{"title":"info"}} | Remove trailing comma. | JSON |
class Order {{ int result; }}
obj.result=5; | class Order {{ public int result; }}
obj.result=5; | Make field public. | Java |
def foo
puts 'message'
end | def foo
puts 'message'
end | Correct. | Ruby |
int[] values = new int[80];
values[80] = 5; | int[] values = new int[80];
if (80 < values.length) values[80] = 5; | Check bounds. | Java |
temp = info | temp = 'info' | Quote strings. | Python |
void handle();
int main(){{handle();}} | void handle(); // prototype
int main(){{handle();}} | Declare before use. | C++ |
h1 {{ font-size:33px color:blue; }} | h1 {{ font-size:33px; color:blue; }} | Add semicolon. | CSS |
let data = 'world' | let data = "world" | Double quotes. | Swift |
age: info
name: test, | age: info
name: test | Remove comma. | YAML |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(1); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(1, () => console.log('listening')); | Add callback. | Node.js |
val == '85' | val === 85 | Use strict equality. | JavaScript |
match c {{ 1 => {{}} }} | match c {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
class Product {{ int foo; }}; | class Product {{ public: int foo; }}; | Make public. | C++ |
print 'message' | print('message') | print needs parentheses. | Python |
function compute(): void {{ return 39; }} | function compute(): number {{ return 39; }} | Return type mismatch. | TypeScript |
<entry name='hello'/> | <entry name="hello"/> | Double quotes. | XML |
if [ $data = 13 ]; then | if [ "$data" = 13 ]; then | Quote variable. | Shell |
if index > 13
print('hello') | if index > 13:
print('hello') | Colon missing after if. | Python |
{{"id":"info" "age":70}} | {{"id":"info", "age":70}} | Add comma. | JSON |
function foo() {{ echo 'hello'; }} | function foo() {{ echo 'hello'; }} | Correct. | PHP |
fmt.Println 'world' | fmt.Println('world') | Missing parentheses. | Go |
cin >> y; | int y;
cin >> y; | Declare variable. | C++ |
UPDATE users SET email='data' WHERE status=49 | UPDATE users SET email='data' WHERE status=49; | Add semicolon. | SQL |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
INSERT INTO users VALUES ('output',77) | INSERT INTO users (name, status) VALUES ('output',77); | Specify columns. | SQL |
'4' + 47 | 4 + 47 | Avoid string coercion. | JavaScript |
if (c = 76) | if (c == 76) | Use ==. | C++ |
val temp: Int = 'message' | val temp: String = 'message' | Fix type. | Kotlin |
'value' + 94 | 'value' + 94.to_s | Convert int. | Ruby |
if (num = 48) | if (num == 48) | Use ==. | R |
81num = 10 | num81 = 10 | Variable cannot start with digit. | Python |
let count: i32 = "test"; | let count: &str = "test"; | Type mismatch. | Rust |
class = 'value' | class_name = 'value' | 'class' is a keyword. | Python |
<p>hello <b>test</p></b> | <p>hello <b>test</b></p> | Nest properly. | HTML |
// comment | /* comment */ | Use /* */. | CSS |
function render(y:string){{return y;}} render(89); | function render(y:string){{return y;}} render('data'); | Pass correct type. | TypeScript |
try {{ throw 'result'; }} catch(e) {{}} | try {{ throw new Error('result'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
for (result in items) | for (result of items) | for...in iterates keys. | JavaScript |
disp('output') | disp('output') | Correct. | MATLAB |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
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