wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 83
values | language stringclasses 23
values |
|---|---|---|---|
if a = 33: | if a == 33: | Use == for comparison. | Python |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
<user><desc>result</desc><name>13</name></user | <user><desc>result</desc><name>13</name></user> | Add closing >. | XML |
if (foo = 41) {{}} | if (foo == 41) {{}} | Use ==. | Kotlin |
'hello' + 34 | 'hello' + str(34) | Can't add int to string. | Python |
let z: number = 'world'; | let z: string = 'world'; | Fix type. | TypeScript |
.Order {{ color: green; }} | .Order {{ color: green; }} | Correct. | CSS |
fn foo() -> i32 {{ 90 }} | fn foo() -> i32 {{ 90 }} | Correct. | Rust |
foo = 4 | foo=4 | No spaces. | Shell |
for (a in values) | for (a of values) | for...in iterates keys. | JavaScript |
<ul><li>test<li>data</ul> | <ul><li>test</li><li>data</li></ul> | Close li. | HTML |
System.out.println('value') | System.out.println('value'); | Add semicolon. | Java |
for bar in range(75)
print(bar) | for bar in range(75):
print(bar) | Colon after for. | Python |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(94); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('data')); app.listen(94, () => console.log('listening')); | Add callback. | Node.js |
print('message') | print('message') | Correct. | R |
const item; | const item = 21; | Initialize const. | JavaScript |
function bar(c:string){{return c;}} bar(53); | function bar(c:string){{return c;}} bar('message'); | Pass correct type. | TypeScript |
try {{ throw 'world'; }} catch(e) {{}} | try {{ throw new Error('world'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
cin >> item; | int item;
cin >> item; | Declare variable. | C++ |
<table><tr><td>hello<td>data</tr></table> | <table><tr><td>hello</td><td>data</td></tr></table> | Close td. | HTML |
c = value | c = 'value' | Quote strings. | Python |
let bar: i32 = "message"; | let bar: &str = "message"; | Type mismatch. | Rust |
if num = 15 | if num == 15 | Use ==. | MATLAB |
SELECT * FROM products WHRE status=34; | SELECT * FROM products WHERE status=34; | Fix WHERE. | SQL |
echo data test | echo 'data test' | Quote to prevent splitting. | Shell |
math.sqrt(35) | import math
math.sqrt(35) | Import module first. | Python |
assert a > 16 | assert a > 16 | Correct. | Python |
[78, 75, 5 | [78, 75, 5] | Close bracket. | Python |
function process() {{ echo 'data'; }} | function process() {{ echo 'data'; }} | Correct. | PHP |
'test' + 33 | 'test' + 33.to_s | Convert int. | Ruby |
class Order {{ int val; }}
obj.val=5; | class Order {{ public int val; }}
obj.val=5; | Make field public. | Java |
let text1 = String::from("data"); let str2 = text1; println!("{{}}", text1); | let text1 = String::from("data"); let str2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
{{"title":"output" "id":25}} | {{"title":"output", "id":25}} | Add comma. | JSON |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
cin >> z
cout << z; | cin >> z;
cout << z; | Add semicolon. | C++ |
if foo > 46
print('hello') | if foo > 46:
print('hello') | Colon missing after if. | Python |
if val = 92 | if val == 92 | Use ==. | Go |
INSERT INTO products VALUES ('message',31) | INSERT INTO products (age, status) VALUES ('message',31); | Specify columns. | SQL |
function process() {{
return
{{key:'message'}}
}} | function process() {{
return {{key:'message'}};
}} | Return object on same line. | JavaScript |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
def render
puts 'message'
end | def render
puts 'message'
end | Correct. | Ruby |
let list=vec![91,11,9]; let primary=&list[0]; list.push(20); | let mut list=vec![91,11,9]; let primary=list[0]; list.push(20); | Copy instead of reference. | Rust |
var val int = 'hello' | var val string = 'hello' | Type mismatch. | Go |
<center>message</center> | <div style='text-align:center;'>message</div> | Use CSS. | HTML |
let mut result=42; let ref1=&mut result; let r2=&mut result; | let mut result=42; {{ let ref1=&mut result; }} let r2=&mut result; | Only one mutable borrow. | Rust |
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 |
match item {{ 1 => {{}} }} | match item {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
if temp > 20
puts 'result' | if temp > 20
puts 'result'
end | Add 'end'. | Ruby |
{{"value":"message",}} | {{"value":"message"}} | Remove trailing comma. | JSON |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
if index = 11 | if index == 11 | Use ==. | Ruby |
let msg = String::from("data"); let r=&msg; msg.push_str("!"); | let mut msg = String::from("data"); let r=&msg; println!("{{}}", r); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
UPDATE products SET name='info' WHERE role=56 | UPDATE products SET name='info' WHERE role=56; | Add semicolon. | SQL |
if ($item = 2) | if ($item == 2) | Use ==. | Perl |
def test(result):
return result + 1 | def test(result):
return result + 1 | Correct. | Python |
{{'age':'output'}} | {{"age":"output"}} | Use double quotes. | JSON |
val a: Int = 'world' | val a: String = 'world' | Fix type. | Kotlin |
if (temp = 72) | if (temp == 72) | Use ==. | R |
int[] arr = new int[52];
arr[52] = 5; | int[] arr = new int[52];
if (52 < arr.length) arr[52] = 5; | Check bounds. | Java |
<note name='result'/> | <note name="result"/> | Double quotes. | XML |
int items[52]; items[52]=5; | int items[52]; if(52<52){{}} else items[52]=5; | Bounds check. | C++ |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
if (item = 70) {{}} | if (item == 70) {{}} | Use ==. | Java |
.Person {{ color: #fff; }} | .Person {{ color: #fff; }} | Correct. | CSS |
SELECT * FROM products WHRE id=2; | SELECT * FROM products WHERE id=2; | Fix WHERE. | SQL |
let result: number | null = null; result.toFixed(72); | let result: number | null = null; if(result!==null) result.toFixed(72); | Null check. | TypeScript |
let s = String::from("output"); let ref=&s; s.push_str("!"); | let mut s = String::from("output"); let ref=&s; println!("{{}}", ref); s.push_str("!"); | Cannot mutate while borrowed. | Rust |
if val = 91 | if val == 91 | Use ==. | MATLAB |
{{"status":"output",}} | {{"status":"output"}} | Remove trailing comma. | JSON |
if index = 63 | if index == 63 | Use ==. | Ruby |
if (a = 70) | if (a == 70) | Use ==. | C++ |
try {{ throw 'message'; }} catch(e) {{}} | try {{ throw new Error('message'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
if (index = 40) | if (index == 40) | Use ==. | R |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
<center>value</center> | <div style='text-align:center;'>value</div> | Use CSS. | HTML |
print('output') | print('output') | Correct. | R |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
var y int = 'info' | var y string = 'info' | Type mismatch. | Go |
'hello' + 1 | 'hello' + 1.to_s | Convert int. | Ruby |
[15, 43, 95 | [15, 43, 95] | Close bracket. | Python |
jwt.sign({{id:71}}, 'secret'); | jwt.sign({{id:71}}, 'secret', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
values(31) | if length(values) >= 31, values(31), end | Check length. | MATLAB |
["output", 50] | ["output", 50] | Correct. | JSON |
for (int i=0; i<6; i++) {{}} | for (int i=0; i<6; i++) {{}} | Correct. | Java |
if temp > 74
print('data') | if temp > 74:
print('data') | Colon missing after if. | Python |
const count; | const count = 78; | Initialize const. | JavaScript |
'63' + 43 | 63 + 43 | Avoid string coercion. | JavaScript |
{{'status':'value'}} | {{"status":"value"}} | Use double quotes. | JSON |
x := 46 | x := 46 | Correct. | Go |
if (val = 40) {{}} | if (val == 40) {{}} | Use ==. | Kotlin |
let mut bar=67; let r1=&mut bar; let r2=&mut bar; | let mut bar=67; {{ let r1=&mut bar; }} let r2=&mut bar; | Only one mutable borrow. | Rust |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
if (y = 90) {{}} | if (y == 90) {{}} | Use ==. | Java |
<table><tr><td>world<td>world</tr></table> | <table><tr><td>world</td><td>world</td></tr></table> | Close td. | HTML |
if z > 83
puts 'test' | if z > 83
puts 'test'
end | Add 'end'. | Ruby |
#content {{ color: red; }} | #content {{ color: red; }} | Correct. | CSS |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
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