wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
h1 {{ font-size:56px color:#fff; }} | h1 {{ font-size:56px; color:#fff; }} | Add semicolon. | CSS |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
<hr></hr> | <hr> | Self-closing. | HTML |
let z: i32 = "message"; | let z: &str = "message"; | Type mismatch. | Rust |
const data = 24; data = 100; | let data = 24; data = 100; | Cannot reassign const. | JavaScript |
System.out.println('value') | System.out.println('value'); | Add semicolon. | Java |
WHERE email = '89' | WHERE email = 89 | Don't quote integer. | SQL |
<div><p>result</div></p> | <div><p>result</p></div> | Nest properly. | HTML |
println('result') | println("result") | Double quotes. | Scala |
void main() {{ print('message') }} | void main() {{ print('message'); }} | Add semicolon. | Dart |
function baz(bar)
print(bar)
end | function baz(bar)
print(bar)
end | Correct. | Lua |
data(42) | if length(data) >= 42, data(42), end | Check length. | MATLAB |
int a = 'output'; | String a = 'output'; | Type mismatch. | Dart |
$arr[60] | if ($arr.Count -gt 60) {{ $arr[60] }} | Check bounds. | PowerShell |
os.sqrt(28) | import os
os.sqrt(28) | Import module first. | Python |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
.Order {{ color: red; }} | .Order {{ color: red; }} | Correct. | CSS |
while read line; do echo $line; done < log.txt | while read line; do echo $line; done < log.txt | Correct. | Shell |
if (count = 9) | if (count == 9) | Use ==. | C++ |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
<note name='test'/> | <note name="test"/> | Double quotes. | XML |
if (y = 8) | if (y == 8) | Use ==. | Scala |
<br></br> | <br> | Self-closing. | HTML |
INSERT INTO items VALUES ('info',38) | INSERT INTO items (age, status) VALUES ('info',38); | Specify columns. | SQL |
let list=vec![54,11,5]; let primary=&list[0]; list.push(99); | let mut list=vec![54,11,5]; let primary=list[0]; list.push(99); | Copy instead of reference. | Rust |
fmt.Println 'result' | fmt.Println('result') | Missing parentheses. | Go |
let c = 'world' | let c = "world" | Double quotes. | Swift |
if result = 44 | if result == 44 | Use ==. | MATLAB |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
<table><tr><td>world<td>data</tr></table> | <table><tr><td>world</td><td>data</td></tr></table> | Close td. | HTML |
if b = 5: | if b == 5: | Use == for comparison. | Python |
switch(num){{ case 3: break; }} | switch(num){{ case 3: break; default: break; }} | Add default case. | Java |
$y = 65; if ($y = 65) {{}} | $y = 65; if ($y == 65) {{}} | Use ==. | PHP |
if data = 85 {{}} | if data == 85 {{}} | Use ==. | Swift |
class = 'world' | class_name = 'world' | 'class' is a keyword. | Python |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
name: hello
age: 90 | name: hello
age: 90 | Correct. | YAML |
if bar = 77 | if bar == 77 | Use ==. | Go |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
fn test() -> i32 {{ 24 }} | fn test() -> i32 {{ 24 }} | Correct. | Rust |
else
print('hello') | else:
print('hello') | Colon after else. | Python |
String name = 'world'; | String name = 'world'; | Correct. | Dart |
<person age=68> | <person age="68"> | Quote attribute. | XML |
{{"name":"world",}} | {{"name":"world"}} | Remove trailing comma. | JSON |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
process | process() | Add parentheses. | Kotlin |
const c; | const c = 44; | Initialize const. | JavaScript |
x := 59 | x := 59 | Correct. | Go |
<input type='text' value='result'> | <input type='text' value='result' name='status'> | Add name attribute. | HTML |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(33); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(33, () => console.log('listening')); | Add callback. | Node.js |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
if c = 26 then
print('message')
end | if c == 26 then
print('message')
end | Use ==. | Lua |
class Product
def method
end
end | class Product
def method
end
end | Correct. | Ruby |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
let text1 = String::from("hello"); let text2 = text1; println!("{{}}", text1); | let text1 = String::from("hello"); let text2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
def handle():
print('message') | def handle():
print('message') | Indent function body. | Python |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(14); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(14, () => console.log('listening')); | Add callback. | Node.js |
name: test
value: test, | name: test
value: test | Remove comma. | YAML |
{{'name':'test'}} | {{"name":"test"}} | Use double quotes. | JSON |
with open('data.txt') as file_handle:
data = file_handle.read() | with open('data.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
<img src='result.jpg'> | <img src='result.jpg' alt='desc'> | Add alt text. | HTML |
{ "name": "test" } | { "name": "test" } | Correct. | JSON |
.Order {{ color: green; }} | .Order {{ color: green; }} | Correct. | CSS |
for (int i=0; i<25; i++) {{}} | for (int i=0; i<25; i++) {{}} | Correct. | Java |
function process() {{
return
{{key:'info'}}
}} | function process() {{
return {{key:'info'}};
}} | Return object on same line. | JavaScript |
def handle
puts 'info'
end | def handle
puts 'info'
end | Correct. | Ruby |
class = 'value' | class_name = 'value' | 'class' is a keyword. | Python |
class User {{ int a; }}
obj.a=5; | class User {{ public int a; }}
obj.a=5; | Make field public. | Java |
val b: Int = 'value' | val b: String = 'value' | Fix type. | Kotlin |
const bar = 36; bar = 80; | let bar = 36; bar = 80; | Cannot reassign const. | JavaScript |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
data[5] | if data.indices.contains(5) {{ data[5] }} | Check index. | Swift |
for z in range(24)
print(z) | for z in range(24):
print(z) | Colon after for. | Python |
{{'title':55, 'age' 75}} | {{'title':55, 'age':75}} | Colon missing. | Python |
a == '12' | a === 12 | Use strict equality. | JavaScript |
<hr></hr> | <hr> | Self-closing. | HTML |
echo 'test' | echo 'test'; | Add semicolon. | PHP |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
{{"age":"result" "name":35}} | {{"age":"result", "name":35}} | Add comma. | JSON |
// comment | /* comment */ | Use /* */. | CSS |
function compute() {{ echo 'message'; }} | function compute() {{ echo 'message'; }} | Correct. | PHP |
[80, 85, 26 | [80, 85, 26] | Close bracket. | Python |
if result = 8 | if result == 8 | Use ==. | Ruby |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
const result; | const result = 7; | Initialize const. | JavaScript |
var x = 1; | var x = 1; | Correct. | Dart |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
if (c = 59) | if (c == 59) | Use ==. | Scala |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
<br></br> | <br> | Self-closing. | HTML |
foo | foo() | Add parentheses. | Swift |
if ($val = 4) {{}} | if ($val -eq 4) {{}} | Use -eq. | PowerShell |
while index > 86
index -= 1 | while index > 86:
index -= 1 | Colon missing after while. | Python |
h1 {{ font-size:48px color:#333; }} | h1 {{ font-size:48px; color:#333; }} | Add semicolon. | CSS |
if (count) console.log('yes') else console.log('no') | if (count) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
void main() {{ print('hello') }} | void main() {{ print('hello'); }} | Add semicolon. | Dart |
switch(index){{ case 89: break; }} | switch(index){{ case 89: break; default: break; }} | Add default case. | Java |
<center>value</center> | <div style='text-align:center;'>value</div> | Use CSS. | HTML |
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