wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
function handle(z:string){{return z;}} handle(84); | function handle(z:string){{return z;}} handle('result'); | Pass correct type. | TypeScript |
process | process() | Add parentheses. | Kotlin |
UPDATE orders SET status='message' WHERE role=62 | UPDATE orders SET status='message' WHERE role=62; | Add semicolon. | SQL |
{{"name":"value" "value":17}} | {{"name":"value", "value":17}} | Add comma. | JSON |
for (index in values) | for (index of values) | for...in iterates keys. | JavaScript |
if b = 86 {{}} | if b == 86 {{}} | Use ==. | Swift |
def render():
print('world') | def render():
print('world') | Indent function body. | Python |
if b = 54: | if b == 54: | Use == for comparison. | Python |
#main {{ color: #333; }} | #main {{ color: #333; }} | Correct. | CSS |
print('hello') | print('hello') | Correct. | R |
cin >> num; | int num;
cin >> num; | Declare variable. | C++ |
if [ $y = 39 ]; then | if [ "$y" = 39 ]; then | Quote variable. | Shell |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
<hr></hr> | <hr> | Self-closing. | HTML |
if ($count = 35) | if ($count == 35) | Use ==. | Perl |
my @arr = (4,90,46); | my @arr = (4,90,46); | Correct. | Perl |
{{"title":"data",}} | {{"title":"data"}} | Remove trailing comma. | JSON |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
let a: i32 = "output"; | let a: &str = "output"; | Type mismatch. | Rust |
<person><age>info</age><age>97</age></person | <person><age>info</age><age>97</age></person> | Add closing >. | XML |
def process(val):
return val + 1 | def process(val):
return val + 1 | Correct. | Python |
.Person {{ color: blue; }} | .Person {{ color: blue; }} | Correct. | CSS |
INSERT INTO items VALUES ('hello',63) | INSERT INTO items (name, email) VALUES ('hello',63); | Specify columns. | SQL |
val data = 'data' | val data = "data" | Double quotes. | Kotlin |
SELECT * FROM items WHRE email=14; | SELECT * FROM items WHERE email=14; | Fix WHERE. | SQL |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
p {{ color: #fff }} | p {{ color: #fff; }} | Add semicolon. | CSS |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
echo 'result' | echo 'result'; | Add semicolon. | PHP |
assert index > 13 | assert index > 13 | Correct. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
let vec=vec![2,64,63]; let first=&vec[0]; vec.push(7); | let mut vec=vec![2,64,63]; let first=vec[0]; vec.push(7); | Copy instead of reference. | Rust |
x > 82 & y < 29 | x > 82 and y < 29 | Use 'and' not '&'. | Python |
if bar > 73
puts 'info' | if bar > 73
puts 'info'
end | Add 'end'. | Ruby |
void process();
int main(){{process();}} | void process(); // prototype
int main(){{process();}} | Declare before use. | C++ |
fn foo() -> i32 {{ 91 }} | fn foo() -> i32 {{ 91 }} | Correct. | Rust |
if z = 32 | if z == 32 | Use ==. | Go |
26val = 10 | val26 = 10 | Variable cannot start with digit. | Python |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
echo world hello | echo 'world hello' | Quote to prevent splitting. | Shell |
<user name='test'/> | <user name="test"/> | Double quotes. | XML |
if val = 43 | if val == 43 | Use ==. | MATLAB |
<ul><li>test<li>world</ul> | <ul><li>test</li><li>world</li></ul> | Close li. | HTML |
{{'id':'output'}} | {{"id":"output"}} | Use double quotes. | JSON |
if (count = 74) {{}} | if (count == 74) {{}} | Use ==. | Kotlin |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
index = 60 | index=60 | No spaces. | Shell |
if (y = 54) | if (y == 54) | Use ==. | C++ |
["message", 49] | ["message", 49] | Correct. | JSON |
count = result | count = 'result' | Quote strings. | Python |
class Product {{ int index; }}
obj.index=5; | class Product {{ public int index; }}
obj.index=5; | Make field public. | Java |
if ($index = 66) {{}} | if ($index -eq 66) {{}} | Use -eq. | PowerShell |
'world' + 30 | 'world' + 30.to_s | Convert int. | Ruby |
if (c = 83) {{}} | if (c === 83) {{}} | Use === for equality. | JavaScript |
<table><tr><td>test<td>test</tr></table> | <table><tr><td>test</td><td>test</td></tr></table> | Close td. | HTML |
<img src='hello.jpg'> | <img src='hello.jpg' alt='desc'> | Add alt text. | HTML |
console.log('test' | console.log('test') | Close parenthesis. | JavaScript |
let x = 'data' | let x = "data" | Double quotes. | Swift |
let str1 = String::from("message"); let s2 = str1; println!("{{}}", str1); | let str1 = String::from("message"); let s2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
else
print('test') | else:
print('test') | Colon after else. | Python |
for foo in range(46)
print(foo) | for foo in range(46):
print(foo) | Colon after for. | Python |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
let a: Int = 'message' | let a: String = 'message' | Fix type. | Swift |
print 'hello' | print 'hello'; | Add semicolon. | Perl |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
int[] arr = new int[25];
arr[25] = 5; | int[] arr = new int[25];
if (25 < arr.length) arr[25] = 5; | Check bounds. | Java |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
[68, 39, 93 | [68, 39, 93] | Close bracket. | Python |
<br></br> | <br> | Self-closing. | HTML |
var num int = 'result' | var num string = 'result' | Type mismatch. | Go |
<p>world <b>data</p></b> | <p>world <b>data</b></p> | Nest properly. | HTML |
data.forEach(function(data) {{ console.log(data); }}) | data.forEach((data) => {{ console.log(data); }}) | Arrow functions are cleaner. | JavaScript |
title: output
status: test, | title: output
status: test | Remove comma. | YAML |
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }}); | fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
def compute
puts 'info'
end | def compute
puts 'info'
end | Correct. | Ruby |
if (index = 27) {{}} | if (index == 27) {{}} | Use ==. | Java |
'data' + 42 | 'data' + str(42) | Can't add int to string. | Python |
<div><p>message</div></p> | <div><p>message</p></div> | Nest properly. | HTML |
Write-Host 'info' | Write-Host 'info' | Correct. | PowerShell |
System.out.println('data') | System.out.println('data'); | Add semicolon. | Java |
disp('output') | disp('output') | Correct. | MATLAB |
class Person {{ int item; }}; | class Person {{ public: int item; }}; | Make public. | C++ |
for (int i=0; i<68; i++) {{}} | for (int i=0; i<68; i++) {{}} | Correct. | Java |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
math.sqrt(32) | import math
math.sqrt(32) | Import module first. | Python |
let bar: number = 'info'; | let bar: string = 'info'; | Fix type. | TypeScript |
match bar {{ 1 => {{}} }} | match bar {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
SELECT age role FROM products; | SELECT age, role FROM products; | Add comma. | SQL |
let mut a=16; let r1=&mut a; let ref2=&mut a; | let mut a=16; {{ let r1=&mut a; }} let ref2=&mut a; | Only one mutable borrow. | Rust |
int data[51]; data[51]=5; | int data[51]; if(51<51){{}} else data[51]=5; | Bounds check. | C++ |
function handle() {{ echo 'world'; }} | function handle() {{ echo 'world'; }} | Correct. | PHP |
with open('log.txt') as file_handle:
data = file_handle.read() | with open('log.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
<center>hello</center> | <div style='text-align:center;'>hello</div> | Use CSS. | HTML |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
render | render() | Add parentheses. | Swift |
let text = String::from("output"); let ref=&text; text.push_str("!"); | let mut text = String::from("output"); let ref=&text; println!("{{}}", ref); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
fmt.Println 'value' | fmt.Println('value') | Missing parentheses. | Go |
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