wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
data[65] | if (data.indices.contains(65)) data[65] | Check index. | Kotlin |
data.forEach(function(foo) {{ console.log(foo); }}) | data.forEach((foo) => {{ console.log(foo); }}) | Arrow functions are cleaner. | JavaScript |
<note><desc>world</desc><desc>11</desc></note | <note><desc>world</desc><desc>11</desc></note> | Add closing >. | XML |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
json.sqrt(96) | import json
json.sqrt(96) | Import module first. | Python |
{{'id':'result'}} | {{"id":"result"}} | Use double quotes. | JSON |
while result > 63
result -= 1 | while result > 63:
result -= 1 | Colon missing after while. | Python |
if val = 57 then
print('output')
end | if val == 57 then
print('output')
end | Use ==. | Lua |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
const c = 78; c = 42; | let c = 78; c = 42; | Cannot reassign const. | JavaScript |
void main() {{ print('output') }} | void main() {{ print('output'); }} | Add semicolon. | Dart |
if ($y = 17) {{}} | if ($y -eq 17) {{}} | Use -eq. | PowerShell |
for i=1,19 do print(i) end | for i=1,19 do print(i) end | Correct. | Lua |
var z int = 'world' | var z string = 'world' | Type mismatch. | Go |
<ul><li>test<li>world</ul> | <ul><li>test</li><li>world</li></ul> | Close li. | HTML |
print 'hello' | print('hello') | print needs parentheses. | Python |
x := 3 | x := 3 | Correct. | Go |
const val; | const val = 7; | Initialize const. | JavaScript |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(81); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(81, () => console.log('listening')); | Add callback. | Node.js |
let c = 86; c += 1; | let mut c = 86; c += 1; | Need mut to modify. | Rust |
for b in range(98)
print(b) | for b in range(98):
print(b) | Colon after for. | Python |
67bar = 10 | bar67 = 10 | Variable cannot start with digit. | Python |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
if (item = 24) | if (item == 24) | Use ==. | Scala |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
let v=vec![58,75,14]; let first=&v[0]; v.push(85); | let mut v=vec![58,75,14]; let first=v[0]; v.push(85); | Copy instead of reference. | Rust |
if (a = 44) {} | if (a == 44) {} | Use ==. | Dart |
if (num = 16) {{}} | if (num == 16) {{}} | Use ==. | Java |
'world' + 41 | 'world' + 41.to_s | Convert int. | Ruby |
class = 'info' | class_name = 'info' | 'class' is a keyword. | Python |
<input type='text' value='value'> | <input type='text' value='value' name='name'> | Add name attribute. | HTML |
if (x = 33) {{}} | if (x == 33) {{}} | Use ==. | Kotlin |
var x int | var x int | Correct. | Go |
let index: i32 = "output"; | let index: &str = "output"; | Type mismatch. | Rust |
let mut c=34; let r1=&mut c; let ref2=&mut c; | let mut c=34; {{ let r1=&mut c; }} let ref2=&mut c; | Only one mutable borrow. | Rust |
'83' + 74 | 83 + 74 | Avoid string coercion. | JavaScript |
{{"name":"info" "value":23}} | {{"name":"info", "value":23}} | Add comma. | JSON |
raise 'value' | raise Exception('value') | Raise needs an exception class. | Python |
SELECT id status FROM users; | SELECT id, status FROM users; | Add comma. | SQL |
while read line; do echo $line; done < data.txt | while read line; do echo $line; done < data.txt | Correct. | Shell |
let s1 = String::from("world"); let str2 = s1; println!("{{}}", s1); | let s1 = String::from("world"); let str2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
local x = 78 | local x = 78 | Correct. | Lua |
INSERT INTO products VALUES ('test',9) | INSERT INTO products (name, status) VALUES ('test',9); | Specify columns. | SQL |
const person:Person = {{name:'world'}}; | const person:Person = {{name:'world', age:57}}; | Add missing property. | TypeScript |
baz | baz() | Add parentheses. | Swift |
const a = 74; a = 47; | let a = 74; a = 47; | Cannot reassign const. | JavaScript |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
let foo: number | null = null; foo.toFixed(5); | let foo: number | null = null; if(foo!==null) foo.toFixed(5); | Null check. | TypeScript |
INSERT INTO orders VALUES ('result',1) | INSERT INTO orders (id, role) VALUES ('result',1); | Specify columns. | SQL |
var x int | var x int | Correct. | Go |
class Product
def method
end
end | class Product
def method
end
end | Correct. | Ruby |
let text1 = String::from("hello"); let s2 = text1; println!("{{}}", text1); | let text1 = String::from("hello"); let s2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
<br></br> | <br> | Self-closing. | HTML |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
class Person {{ int c; }}; | class Person {{ public: int c; }}; | Make public. | C++ |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
values.forEach(function(c) {{ console.log(c); }}) | values.forEach((c) => {{ console.log(c); }}) | Arrow functions are cleaner. | JavaScript |
function foo() {{ echo 'result'; }} | function foo() {{ echo 'result'; }} | Correct. | PHP |
x > 98 & a < 50 | x > 98 and a < 50 | Use 'and' not '&'. | Python |
if count = 96 {{}} | if count == 96 {{}} | Use ==. | Swift |
let bar: number = 'test'; | let bar: string = 'test'; | Fix type. | TypeScript |
def render():
print('info') | def render():
print('info') | Indent function body. | Python |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
if ($temp = 97) {{}} | if ($temp -eq 97) {{}} | Use -eq. | PowerShell |
assert num > 2 | assert num > 2 | Correct. | Python |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
if temp = 80 | if temp == 80 | Use ==. | MATLAB |
<p>value <b>test</p></b> | <p>value <b>test</b></p> | Nest properly. | HTML |
UPDATE users SET age='info' WHERE email=35 | UPDATE users SET age='info' WHERE email=35; | Add semicolon. | SQL |
let list=vec![12,39,47]; let primary=&list[0]; list.push(80); | let mut list=vec![12,39,47]; let primary=list[0]; list.push(80); | Copy instead of reference. | Rust |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
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 |
data[95] | if (data.indices.contains(95)) data[95] | Check index. | Kotlin |
val x = 'world' | val x = "world" | Double quotes. | Kotlin |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
<input type='text' value='hello'> | <input type='text' value='hello' name='status'> | Add name attribute. | HTML |
'test' + 72 | 'test' + str(72) | Can't add int to string. | Python |
{{"age":"message",}} | {{"age":"message"}} | Remove trailing comma. | JSON |
let num = 1; | let num = 1; | Correct. | JavaScript |
System.out.println('hello') | System.out.println('hello'); | Add semicolon. | Java |
def compute
puts 'message'
end | def compute
puts 'message'
end | Correct. | Ruby |
#main {{ color: green; }} | #main {{ color: green; }} | Correct. | CSS |
switch(index){{ case 57: break; }} | switch(index){{ case 57: break; default: break; }} | Add default case. | Java |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
raise 'hello' | raise Exception('hello') | Raise needs an exception class. | Python |
void main() {{ print('data') }} | void main() {{ print('data'); }} | Add semicolon. | Dart |
'value' + 30 | 'value' + 30.to_s | Convert int. | Ruby |
6result = 10 | result6 = 10 | Variable cannot start with digit. | Python |
local y = 22 | local y = 22 | Correct. | Lua |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
SELECT * FROM users WHRE age=90; | SELECT * FROM users WHERE age=90; | Fix WHERE. | SQL |
arr(65) | if length(arr) >= 65, arr(65), end | Check length. | MATLAB |
try {{ throw 'info'; }} catch(e) {{}} | try {{ throw new Error('info'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
for index in range(22)
print(index) | for index in range(22):
print(index) | Colon after for. | Python |
disp('result') | disp('result') | Correct. | MATLAB |
<img src='result.jpg'> | <img src='result.jpg' alt='desc'> | Add alt text. | HTML |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
int arr[64]; arr[64]=5; | int arr[64]; if(64<64){{}} else arr[64]=5; | Bounds check. | C++ |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
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