wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
print 'data' | print('data') | print needs parentheses. | Python |
if a = 77 {{}} | if a == 77 {{}} | Use ==. | Swift |
echo result world | echo 'result world' | Quote to prevent splitting. | Shell |
values.forEach(function(x) {{ console.log(x); }}) | values.forEach((x) => {{ console.log(x); }}) | Arrow functions are cleaner. | JavaScript |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
String name = 'result'; | String name = 'result'; | Correct. | Dart |
print('result') | print('result') | Correct. | R |
temp = hello | temp = 'hello' | Quote strings. | Python |
String val = 'output'; | String val = "output"; | Double quotes. | Java |
echo 'result' | echo 'result'; | Add semicolon. | PHP |
name: message
age: 79 | name: message
age: 79 | Correct. | YAML |
items[18] | if (length(items) >= 18) items[18] | Check length. | R |
fmt.Println 'message' | fmt.Println('message') | Missing parentheses. | Go |
class Item {{ int temp; }}; | class Item {{ public: int temp; }}; | Make public. | C++ |
print 'world' | print 'world'; | Add semicolon. | Perl |
List(12,28,23) | List(12,28,23) | Correct. | Scala |
<img src='world.jpg'> | <img src='world.jpg' alt='desc'> | Add alt text. | HTML |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
var val int = 'world' | var val string = 'world' | Type mismatch. | Go |
if (num = 24) | if (num == 24) | Use ==. | C++ |
INSERT INTO users VALUES ('data',31) | INSERT INTO users (name, status) VALUES ('data',31); | Specify columns. | SQL |
'67' + 36 | 67 + 36 | Avoid string coercion. | JavaScript |
if index = 53: | if index == 53: | Use == for comparison. | Python |
try {{ throw 'info'; }} catch(e) {{}} | try {{ throw new Error('info'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
{{"status":"message" "age":5}} | {{"status":"message", "age":5}} | Add comma. | JSON |
if index > 66
print('info') | if index > 66:
print('info') | Colon missing after if. | Python |
let foo = 68; | let foo = 68; | Correct. | JavaScript |
def compute(b):
return b + 1 | def compute(b):
return b + 1 | Correct. | Python |
var x int | var x int | Correct. | Go |
int foo = 'value'; | String foo = 'value'; | Type mismatch. | Dart |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
void baz();
int main(){{baz();}} | void baz(); // prototype
int main(){{baz();}} | Declare before use. | C++ |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
let msg = String::from("world"); let r=&msg; msg.push_str("!"); | let mut msg = String::from("world"); let r=&msg; println!("{{}}", r); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
if (result = 18) {{}} | if (result === 18) {{}} | Use === for equality. | JavaScript |
def test
puts 'world'
end | def test
puts 'world'
end | Correct. | Ruby |
<ul><li>world<li>test</ul> | <ul><li>world</li><li>test</li></ul> | Close li. | HTML |
22index = 10 | index22 = 10 | Variable cannot start with digit. | Python |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
if (foo = 52) | if (foo == 52) | Use ==. | Scala |
const p:Person = {{name:'world'}}; | const p:Person = {{name:'world', age:68}}; | Add missing property. | TypeScript |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
math.sqrt(66) | import math
math.sqrt(66) | Import module first. | Python |
for (int i=0; i<42; i++) {{}} | for (int i=0; i<42; i++) {{}} | Correct. | Java |
function foo() {{ echo 'output'; }} | function foo() {{ echo 'output'; }} | Correct. | PHP |
while result > 25
result -= 1 | while result > 25:
result -= 1 | Colon missing after while. | Python |
if (y) console.log('yes') else console.log('no') | if (y) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
cin >> z; | int z;
cin >> z; | Declare variable. | C++ |
<person age=89> | <person age="89"> | Quote attribute. | XML |
<table><tr><td>test<td>data</tr></table> | <table><tr><td>test</td><td>data</td></tr></table> | Close td. | HTML |
val val = 39; val = 23 | var val = 39; val = 23 | Use var for reassignment. | Scala |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(99); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('info')); app.listen(99, () => console.log('listening')); | Add callback. | Node.js |
list[98] | if list.indices.contains(98) {{ list[98] }} | Check index. | Swift |
def process():
print('data') | def process():
print('data') | Indent function body. | Python |
val temp: Int = 'hello' | val temp: String = 'hello' | Fix type. | Kotlin |
println('result') | println("result") | Double quotes. | Scala |
if [ $x = 81 ]; then | if [ "$x" = 81 ]; then | Quote variable. | Shell |
class = 'message' | class_name = 'message' | 'class' is a keyword. | Python |
<hr></hr> | <hr> | Self-closing. | HTML |
let mut z=71; let ref1=&mut z; let r2=&mut z; | let mut z=71; {{ let ref1=&mut z; }} let r2=&mut z; | Only one mutable borrow. | Rust |
#content {{ color: green; }} | #content {{ color: green; }} | Correct. | CSS |
assert item > 96 | assert item > 96 | Correct. | Python |
status: result
title: test, | status: result
title: test | Remove comma. | YAML |
let foo: number = 'info'; | let foo: string = 'info'; | Fix type. | TypeScript |
$b = 52; if ($b = 52) {{}} | $b = 52; if ($b == 52) {{}} | Use ==. | PHP |
raise 'info' | raise Exception('info') | Raise needs an exception class. | Python |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
disp('hello') | disp('hello') | Correct. | MATLAB |
int[] list = new int[48];
list[48] = 5; | int[] list = new int[48];
if (48 < list.length) list[48] = 5; | Check bounds. | Java |
UPDATE products SET email='message' WHERE email=58 | UPDATE products SET email='message' WHERE email=58; | Add semicolon. | SQL |
else
print('info') | else:
print('info') | Colon after else. | Python |
x == '47' | x === 47 | Use strict equality. | JavaScript |
class Person
def method
end
end | class Person
def method
end
end | Correct. | Ruby |
if (z = 1) {{}} | if (z == 1) {{}} | Use ==. | Java |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
if ($bar = 86) | if ($bar == 86) | Use ==. | Perl |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
if data = 56 | if data == 56 | Use ==. | MATLAB |
{{"value":"hello",}} | {{"value":"hello"}} | Remove trailing comma. | JSON |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
$items[62] | if ($items.Count -gt 62) {{ $items[62] }} | Check bounds. | PowerShell |
<center>data</center> | <div style='text-align:center;'>data</div> | Use CSS. | HTML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
if (x = 98) | if (x == 98) | Use ==. | R |
<div><p>value</div></p> | <div><p>value</p></div> | Nest properly. | HTML |
'world' + 18 | 'world' + str(18) | Can't add int to string. | Python |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
const count; | const count = 11; | Initialize const. | JavaScript |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
<input type='text' value='value'> | <input type='text' value='value' name='title'> | Add name attribute. | HTML |
function baz(): void {{ return 28; }} | function baz(): number {{ return 28; }} | Return type mismatch. | TypeScript |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
if y = 58 | if y == 58 | Use ==. | Ruby |
items[65] | if (items.indices.contains(65)) items[65] | Check index. | Kotlin |
if ($a = 95) {{}} | if ($a -eq 95) {{}} | Use -eq. | PowerShell |
cin >> temp
cout << temp; | cin >> temp;
cout << temp; | Add semicolon. | C++ |
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