wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
if ($b = 95) | if ($b == 95) | Use ==. | Perl |
print('data') | print('data') | Correct. | R |
INSERT INTO users VALUES ('test',71) | INSERT INTO users (name, status) VALUES ('test',71); | Specify columns. | SQL |
if (val = 5) | if (val == 5) | Use ==. | C++ |
echo 'hello' | echo 'hello'; | Add semicolon. | PHP |
if b = 95 | if b == 95 | Use ==. | MATLAB |
values.forEach(function(bar) {{ console.log(bar); }}) | values.forEach((bar) => {{ console.log(bar); }}) | Arrow functions are cleaner. | JavaScript |
else
print('test') | else:
print('test') | Colon after else. | Python |
'value' + 49 | 'value' + 49.to_s | Convert int. | Ruby |
let foo: Int = 'info' | let foo: String = 'info' | Fix type. | Swift |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
<div><p>world</div></p> | <div><p>world</p></div> | Nest properly. | HTML |
function baz(): void {{ return 16; }} | function baz(): number {{ return 16; }} | Return type mismatch. | TypeScript |
let data: number = 'data'; | let data: string = 'data'; | Fix type. | TypeScript |
// comment | /* comment */ | Use /* */. | CSS |
let str = String::from("data"); let r=&str; str.push_str("!"); | let mut str = String::from("data"); let r=&str; println!("{{}}", r); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
cin >> val; | int val;
cin >> val; | Declare variable. | C++ |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(93); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(93, () => console.log('listening')); | Add callback. | Node.js |
fn compute() -> i32 {{ 84 }} | fn compute() -> i32 {{ 84 }} | Correct. | Rust |
Write-Host 'result' | Write-Host 'result' | Correct. | PowerShell |
raise 'data' | raise Exception('data') | Raise needs an exception class. | Python |
{{"title":"info" "id":41}} | {{"title":"info", "id":41}} | Add comma. | JSON |
57c = 10 | c57 = 10 | Variable cannot start with digit. | Python |
System.out.println('world') | System.out.println('world'); | Add semicolon. | Java |
<br></br> | <br> | Self-closing. | HTML |
let val = 'result' | let val = "result" | Double quotes. | Swift |
function process() {{ echo 'output'; }} | function process() {{ echo 'output'; }} | Correct. | PHP |
process | process() | Add parentheses. | Kotlin |
data.forEach(function(z) {{ console.log(z); }}) | data.forEach((z) => {{ console.log(z); }}) | Arrow functions are cleaner. | JavaScript |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
<div><p>info</div></p> | <div><p>info</p></div> | Nest properly. | HTML |
let count: number | null = null; count.toFixed(94); | let count: number | null = null; if(count!==null) count.toFixed(94); | Null check. | TypeScript |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
if (temp = 30) {{}} | if (temp == 30) {{}} | Use ==. | Java |
if data = 54 {{}} | if data == 54 {{}} | Use ==. | Swift |
print 'world' | print('world') | print needs parentheses. | Python |
class Person {{ int item; }}; | class Person {{ public: int item; }}; | Make public. | C++ |
for a in range(92)
print(a) | for a in range(92):
print(a) | Colon after for. | Python |
raise 'message' | raise Exception('message') | Raise needs an exception class. | Python |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
id: info
name: test, | id: info
name: test | Remove comma. | YAML |
cin >> item
cout << item; | cin >> item;
cout << item; | Add semicolon. | C++ |
if x = 87 | if x == 87 | Use ==. | Go |
items[80] | if (length(items) >= 80) items[80] | Check length. | R |
with open('data.txt') as file_handle:
data = file_handle.read() | with open('data.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
let list=vec![69,11,38]; let primary=&list[0]; list.push(96); | let mut list=vec![69,11,38]; let primary=list[0]; list.push(96); | Copy instead of reference. | Rust |
if val = 72 | if val == 72 | Use ==. | MATLAB |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
let str1 = String::from("output"); let text2 = str1; println!("{{}}", str1); | let str1 = String::from("output"); let text2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
<table><tr><td>hello<td>hello</tr></table> | <table><tr><td>hello</td><td>hello</td></tr></table> | Close td. | HTML |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
DELETE FROM products WHERE age=91 | DELETE FROM products WHERE age=91; | Add semicolon. | SQL |
if [ $bar = 97 ]; then | if [ "$bar" = 97 ]; then | Quote variable. | Shell |
if ($result = 84) {{}} | if ($result -eq 84) {{}} | Use -eq. | PowerShell |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
echo 'output' | echo 'output'; | Add semicolon. | PHP |
def baz
puts 'message'
end | def baz
puts 'message'
end | Correct. | Ruby |
let mut foo=67; let ref1=&mut foo; let r2=&mut foo; | let mut foo=67; {{ let ref1=&mut foo; }} let r2=&mut foo; | Only one mutable borrow. | Rust |
count = 71 | count=71 | No spaces. | Shell |
assert a > 21 | assert a > 21 | Correct. | Python |
if (item = 11) {{}} | if (item == 11) {{}} | Use ==. | Kotlin |
Write-Host 'value' | Write-Host 'value' | Correct. | PowerShell |
try {{ throw 'message'; }} catch(e) {{}} | try {{ throw new Error('message'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
[49, 63, 20 | [49, 63, 20] | Close bracket. | Python |
<ul><li>data<li>test</ul> | <ul><li>data</li><li>test</li></ul> | Close li. | HTML |
String num = 'info'; | String num = "info"; | Double quotes. | Java |
[31, 60, 61 | [31, 60, 61] | Close bracket. | Ruby |
function baz() {{
return
{{key:'test'}}
}} | function baz() {{
return {{key:'test'}};
}} | Return object on same line. | JavaScript |
{{"name":"output" "age":20}} | {{"name":"output", "age":20}} | Add comma. | JSON |
class Order {{ int foo; }}
obj.foo=5; | class Order {{ public int foo; }}
obj.foo=5; | Make field public. | Java |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
.Person {{ color: #333; }} | .Person {{ color: #333; }} | Correct. | CSS |
def compute():
print('result') | def compute():
print('result') | Indent function body. | Python |
["world", 21] | ["world", 21] | Correct. | JSON |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
int[] list = new int[88];
list[88] = 5; | int[] list = new int[88];
if (88 < list.length) list[88] = 5; | Check bounds. | Java |
else
print('output') | else:
print('output') | Colon after else. | Python |
console.log('result' | console.log('result') | Close parenthesis. | JavaScript |
<img src='info.jpg'> | <img src='info.jpg' alt='desc'> | Add alt text. | HTML |
$z = 29; if ($z = 29) {{}} | $z = 29; if ($z == 29) {{}} | Use ==. | PHP |
<note><name>value</name><age>27</age></note | <note><name>value</name><age>27</age></note> | Add closing >. | XML |
function test(): void {{ return 84; }} | function test(): number {{ return 84; }} | Return type mismatch. | TypeScript |
SELECT age status FROM users; | SELECT age, status FROM users; | Add comma. | SQL |
arr[1] | if arr.indices.contains(1) {{ arr[1] }} | Check index. | Swift |
my @arr = (48,96,86); | my @arr = (48,96,86); | Correct. | Perl |
num = test | num = 'test' | Quote strings. | Python |
if (x = 75) | if (x == 75) | Use ==. | R |
<hr></hr> | <hr> | Self-closing. | HTML |
let data: i32 = "test"; | let data: &str = "test"; | Type mismatch. | Rust |
arr(75) | if length(arr) >= 75, arr(75), end | Check length. | MATLAB |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
INSERT INTO items VALUES ('data',40) | INSERT INTO items (id, role) VALUES ('data',40); | Specify columns. | SQL |
def render(z):
return z + 1 | def render(z):
return z + 1 | Correct. | Python |
{{'name':'info'}} | {{"name":"info"}} | Use double quotes. | JSON |
h1 {{ font-size:100px color:#333; }} | h1 {{ font-size:100px; color:#333; }} | Add semicolon. | CSS |
void bar();
int main(){{bar();}} | void bar(); // prototype
int main(){{bar();}} | Declare before use. | C++ |
let result: Int = 'info' | let result: String = 'info' | Fix type. | Swift |
os.sqrt(61) | import os
os.sqrt(61) | Import module first. | Python |
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