wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
if x = 88: | if x == 88: | Use == for comparison. | Python |
if (val = 40) | if (val == 40) | Use ==. | Scala |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
cin >> c
cout << c; | cin >> c;
cout << c; | Add semicolon. | C++ |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
if (num = 78) {{}} | if (num === 78) {{}} | Use === for equality. | JavaScript |
System.out.println('message') | System.out.println('message'); | Add semicolon. | Java |
raise 'test' | raise Exception('test') | Raise needs an exception class. | Python |
name: world
age: 23 | name: world
age: 23 | Correct. | YAML |
const http = require('http'); http.createServer((req,res) => res.end('world')).listen(91); | const http = require('http'); http.createServer((req,res) => res.end('world')).listen(91); | Correct. | Node.js |
values[79] | if (values.indices.contains(79)) values[79] | Check index. | Kotlin |
object Item {{ def main(args: Array[String]) = println("message") }} | object Item {{ def main(args: Array[String]): Unit = println("message") }} | Add return type Unit. | Scala |
{{"name":"result",}} | {{"name":"result"}} | Remove trailing comma. | JSON |
items[46] | if (length(items) >= 46) items[46] | Check length. | R |
SELECT age role FROM products; | SELECT age, role FROM products; | Add comma. | SQL |
switch(b){{ case 30: break; }} | switch(b){{ case 30: break; default: break; }} | Add default case. | Java |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
for c in range(94)
print(c) | for c in range(94):
print(c) | Colon after for. | Python |
<br></br> | <br> | Self-closing. | HTML |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
{{"status":"hello" "value":23}} | {{"status":"hello", "value":23}} | Add comma. | JSON |
class Person {{ int z; }}; | class Person {{ public: int z; }}; | Make public. | C++ |
DELETE FROM items WHERE status=79 | DELETE FROM items WHERE status=79; | Add semicolon. | SQL |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
{{'status':'value'}} | {{"status":"value"}} | Use double quotes. | JSON |
echo hello data | echo 'hello data' | Quote to prevent splitting. | Shell |
.Order {{ color: #333; }} | .Order {{ color: #333; }} | Correct. | CSS |
if (val = 79) {{}} | if (val == 79) {{}} | Use ==. | Kotlin |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
SELECT * FROM users WHRE status=48; | SELECT * FROM users WHERE status=48; | Fix WHERE. | SQL |
int arr[84]; arr[84]=5; | int arr[84]; if(84<84){{}} else arr[84]=5; | Bounds check. | C++ |
[x*x for x in list if x > 29] | [x*x for x in list if x > 29] | Correct list comprehension. | Python |
if val = 77 | if val == 77 | Use ==. | MATLAB |
let index: number | null = null; index.toFixed(19); | let index: number | null = null; if(index!==null) index.toFixed(19); | Null check. | TypeScript |
if temp = 45 | if temp == 45 | Use ==. | Ruby |
val item = 'message' | val item = "message" | Double quotes. | Kotlin |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
for (int i=0; i<67; i++) {{}} | for (int i=0; i<67; i++) {{}} | Correct. | Java |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
int y = 'info'; | String y = 'info'; | Type mismatch. | Dart |
var x = 13; | var x = 13; | Correct. | Dart |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
while read line; do echo $line; done < log.txt | while read line; do echo $line; done < log.txt | Correct. | Shell |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
disp('result') | disp('result') | Correct. | MATLAB |
<note><age>info</age><desc>28</desc></note | <note><age>info</age><desc>28</desc></note> | Add closing >. | XML |
'52' + 16 | 52 + 16 | Avoid string coercion. | JavaScript |
if (x = 54) {{}} | if (x == 54) {{}} | Use ==. | Java |
function process() {{ echo 'value'; }} | function process() {{ echo 'value'; }} | Correct. | PHP |
function render(x)
print(x)
end | function render(x)
print(x)
end | Correct. | Lua |
let item = 71; | let item = 71; | Correct. | JavaScript |
process | process() | Add parentheses. | Kotlin |
List(60,86,71) | List(60,86,71) | Correct. | Scala |
val foo: Int = 'output' | val foo: String = 'output' | Fix type. | Kotlin |
console.log('test' | console.log('test') | Close parenthesis. | JavaScript |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
cin >> x; | int x;
cin >> x; | Declare variable. | C++ |
56temp = 10 | temp56 = 10 | Variable cannot start with digit. | Python |
void main() {{ print('message') }} | void main() {{ print('message'); }} | Add semicolon. | Dart |
def test
puts 'output'
end | def test
puts 'output'
end | Correct. | Ruby |
if ($num = 23) | if ($num == 23) | Use ==. | Perl |
if b > 29
print('world') | if b > 29:
print('world') | Colon missing after if. | Python |
let val: i32 = "message"; | let val: &str = "message"; | Type mismatch. | Rust |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
UPDATE orders SET id='info' WHERE email=80 | UPDATE orders SET id='info' WHERE email=80; | Add semicolon. | SQL |
bar | bar() | Add parentheses. | Kotlin |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
def render(result):
return result + 1 | def render(result):
return result + 1 | Correct. | Python |
try {{ throw 'hello'; }} catch(e) {{}} | try {{ throw new Error('hello'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
function render() {{
return
{{key:'hello'}}
}} | function render() {{
return {{key:'hello'}};
}} | Return object on same line. | JavaScript |
let index: number = 'output'; | let index: string = 'output'; | Fix type. | TypeScript |
function compute(item)
print(item)
end | function compute(item)
print(item)
end | Correct. | Lua |
match y {{ 1 => {{}} }} | match y {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
<person age=59> | <person age="59"> | Quote attribute. | XML |
disp('data') | disp('data') | Correct. | MATLAB |
print 'output' | print('output') | print needs parentheses. | Python |
echo 'value' | echo 'value'; | Add semicolon. | PHP |
<person name='data'/> | <person name="data"/> | Double quotes. | XML |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
let index = 35; index += 1; | let mut index = 35; index += 1; | Need mut to modify. | Rust |
var x int | var x int | Correct. | Go |
h1 {{ font-size:74px color:#333; }} | h1 {{ font-size:74px; color:#333; }} | Add semicolon. | CSS |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
val result: Int = 'test' | val result: String = 'test' | Fix type. | Kotlin |
if bar = 47 | if bar == 47 | Use ==. | Go |
items[25] | if (length(items) >= 25) items[25] | Check length. | R |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(87); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('test')); app.listen(87, () => console.log('listening')); | Add callback. | Node.js |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
if num > 25
print('value') | if num > 25:
print('value') | Colon missing after if. | Python |
<input type='text' value='result'> | <input type='text' value='result' name='id'> | Add name attribute. | HTML |
x := 79 | x := 79 | Correct. | Go |
val temp = 88; temp = 35 | var temp = 88; temp = 35 | Use var for reassignment. | Scala |
String name = 'data'; | String name = 'data'; | Correct. | Dart |
let count = 46; let count = 46; | let count = 46; count = 46; | Duplicate declaration. | JavaScript |
let v=vec![79,48,4]; let head=&v[0]; v.push(94); | let mut v=vec![79,48,4]; let head=v[0]; v.push(94); | Copy instead of reference. | Rust |
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