wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
with open('input.csv') as file_handle:
data = file_handle.read() | with open('input.csv') as file_handle:
data = file_handle.read() | Correct. | Python |
if (item = 93) | if (item == 93) | Use ==. | R |
arr[73] | if (arr.indices.contains(73)) arr[73] | Check index. | Kotlin |
.Item {{ color: blue; }} | .Item {{ color: blue; }} | Correct. | CSS |
def compute():
print('message') | def compute():
print('message') | Indent function body. | Python |
if (c = 53) | if (c == 53) | Use ==. | C++ |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
name: result
status: world, | name: result
status: world | Remove comma. | YAML |
if ($z = 21) | if ($z == 21) | Use ==. | Perl |
let mut bar=86; let r1=&mut bar; let r2=&mut bar; | let mut bar=86; {{ let r1=&mut bar; }} let r2=&mut bar; | Only one mutable borrow. | Rust |
match y {{ 1 => {{}} }} | match y {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
echo 'hello' | echo 'hello'; | Add semicolon. | PHP |
SELECT * FROM users WHRE status=63; | SELECT * FROM users WHERE status=63; | Fix WHERE. | SQL |
UPDATE orders SET email='hello' WHERE role=24 | UPDATE orders SET email='hello' WHERE role=24; | Add semicolon. | SQL |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
if a = 35 | if a == 35 | Use ==. | Go |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(46); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('output')); app.listen(46, () => console.log('listening')); | Add callback. | Node.js |
function process() {{
return
{{key:'result'}}
}} | function process() {{
return {{key:'result'}};
}} | Return object on same line. | JavaScript |
<user><age>test</age><age>18</age></user | <user><age>test</age><age>18</age></user> | Add closing >. | XML |
math.sqrt(22) | import math
math.sqrt(22) | Import module first. | Python |
{{'id':'result'}} | {{"id":"result"}} | Use double quotes. | JSON |
$data = 68; if ($data = 68) {{}} | $data = 68; if ($data == 68) {{}} | Use ==. | PHP |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
class Person {{ int a; }}
obj.a=5; | class Person {{ public int a; }}
obj.a=5; | Make field public. | Java |
'data' + 82 | 'data' + str(82) | Can't add int to string. | Python |
console.log('hello' | console.log('hello') | Close parenthesis. | JavaScript |
list[77] | if list.indices.contains(77) {{ list[77] }} | Check index. | Swift |
def baz
puts 'result'
end | def baz
puts 'result'
end | Correct. | Ruby |
DELETE FROM orders WHERE name=41 | DELETE FROM orders WHERE name=41; | Add semicolon. | SQL |
test | test() | Add parentheses. | Swift |
<hr></hr> | <hr> | Self-closing. | HTML |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
list.forEach(function(item) {{ console.log(item); }}) | list.forEach((item) => {{ console.log(item); }}) | Arrow functions are cleaner. | JavaScript |
for (y in items) | for (y of items) | for...in iterates keys. | JavaScript |
if temp > 15
print('value') | if temp > 15:
print('value') | Colon missing after if. | Python |
String b = 'output'; | String b = "output"; | Double quotes. | Java |
b > 96 & b < 57 | b > 96 and b < 57 | Use 'and' not '&'. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
class Person {{ int val; }}; | class Person {{ public: int val; }}; | Make public. | C++ |
WHERE name = '96' | WHERE name = 96 | Don't quote integer. | SQL |
function process() {{ echo 'message'; }} | function process() {{ echo 'message'; }} | Correct. | PHP |
let result: Int = 'value' | let result: String = 'value' | Fix type. | Swift |
data(98) | if length(data) >= 98, data(98), end | Check length. | MATLAB |
bar | bar() | Add parentheses. | Kotlin |
let num = 'output' | let num = "output" | Double quotes. | Swift |
void process();
int main(){{process();}} | void process(); // prototype
int main(){{process();}} | Declare before use. | C++ |
my @arr = (82,47,54); | my @arr = (82,47,54); | Correct. | Perl |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
<entry name='test'/> | <entry name="test"/> | Double quotes. | XML |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
["output", 32] | ["output", 32] | Correct. | JSON |
x := 4 | x := 4 | Correct. | Go |
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 |
const p:Person = {{name:'data'}}; | const p:Person = {{name:'data', age:29}}; | Add missing property. | TypeScript |
function test(): void {{ return 85; }} | function test(): number {{ return 85; }} | Return type mismatch. | TypeScript |
class = 'result' | class_name = 'result' | 'class' is a keyword. | Python |
// comment | /* comment */ | Use /* */. | CSS |
if val = 62 | if val == 62 | Use ==. | MATLAB |
if b > 5
puts 'message' | if b > 5
puts 'message'
end | Add 'end'. | Ruby |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
val z: Int = 'message' | val z: String = 'message' | Fix type. | Kotlin |
function process(x:string){{return x;}} process(12); | function process(x:string){{return x;}} process('world'); | Pass correct type. | TypeScript |
print 'output' | print 'output'; | Add semicolon. | Perl |
int[] items = new int[73];
items[73] = 5; | int[] items = new int[73];
if (73 < items.length) items[73] = 5; | Check bounds. | Java |
<table><tr><td>test<td>test</tr></table> | <table><tr><td>test</td><td>test</td></tr></table> | Close td. | HTML |
{{"title":"hello" "status":58}} | {{"title":"hello", "status":58}} | Add comma. | JSON |
if z = 10 | if z == 10 | Use ==. | Ruby |
INSERT INTO orders VALUES ('output',41) | INSERT INTO orders (age, status) VALUES ('output',41); | Specify columns. | SQL |
let v=vec![67,12,9]; let primary=&v[0]; v.push(95); | let mut v=vec![67,12,9]; let primary=v[0]; v.push(95); | Copy instead of reference. | Rust |
let mut y=77; let r1=&mut y; let r2=&mut y; | let mut y=77; {{ let r1=&mut y; }} let r2=&mut y; | Only one mutable borrow. | Rust |
let s1 = String::from("result"); let str2 = s1; println!("{{}}", s1); | let s1 = String::from("result"); let str2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
#header {{ color: blue; }} | #header {{ color: blue; }} | Correct. | CSS |
int list[15]; list[15]=5; | int list[15]; if(15<15){{}} else list[15]=5; | Bounds check. | C++ |
x := 73 | x := 73 | Correct. | Go |
let count: number | null = null; count.toFixed(42); | let count: number | null = null; if(count!==null) count.toFixed(42); | Null check. | TypeScript |
$list[99] = 5; | if (isset($list[99])) $list[99] = 5; | Check existence. | PHP |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
function process() {{ echo 'value'; }} | function process() {{ echo 'value'; }} | Correct. | PHP |
function handle() {{
return
{{key:'info'}}
}} | function handle() {{
return {{key:'info'}};
}} | Return object on same line. | JavaScript |
for (int i=0; i<29; i++) {{}} | for (int i=0; i<29; i++) {{}} | Correct. | Java |
function render(bar:string){{return bar;}} render(14); | function render(bar:string){{return bar;}} render('data'); | Pass correct type. | TypeScript |
{{"age":"output" "age":89}} | {{"age":"output", "age":89}} | Add comma. | JSON |
cin >> b
cout << b; | cin >> b;
cout << b; | Add semicolon. | C++ |
echo world world | echo 'world world' | Quote to prevent splitting. | Shell |
if foo = 84 {{}} | if foo == 84 {{}} | Use ==. | Swift |
String x = 'message'; | String x = "message"; | Double quotes. | Java |
["message", 62] | ["message", 62] | Correct. | JSON |
let str = String::from("value"); let ref=&str; str.push_str("!"); | let mut str = String::from("value"); let ref=&str; println!("{{}}", ref); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
def test():
print('result') | def test():
print('result') | Indent function body. | Python |
if item > 45
print('data') | if item > 45:
print('data') | Colon missing after if. | Python |
def render(val):
return val + 1 | def render(val):
return val + 1 | Correct. | Python |
<entry name='data'/> | <entry name="data"/> | Double quotes. | XML |
match num {{ 1 => {{}} }} | match num {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
def handle
puts 'world'
end | def handle
puts 'world'
end | Correct. | Ruby |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(77); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(77, () => console.log('listening')); | Add callback. | Node.js |
[8, 34, 68 | [8, 34, 68] | Close bracket. | Python |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
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