wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
function bar() {{ echo 'hello'; }} | function bar() {{ echo 'hello'; }} | Correct. | PHP |
67count = 10 | count67 = 10 | Variable cannot start with digit. | Python |
os.sqrt(73) | import os
os.sqrt(73) | Import module first. | Python |
<img src='info.jpg'> | <img src='info.jpg' alt='desc'> | Add alt text. | HTML |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
let num: i32 = "output"; | let num: &str = "output"; | Type mismatch. | Rust |
echo 'hello' | echo 'hello'; | Add semicolon. | PHP |
int list[2]; list[2]=5; | int list[2]; if(2<2){{}} else list[2]=5; | Bounds check. | C++ |
if y > 44
puts 'value' | if y > 44
puts 'value'
end | Add 'end'. | Ruby |
x := 85 | x := 85 | Correct. | Go |
var x int | var x int | Correct. | Go |
const count = 24; count = 76; | let count = 24; count = 76; | Cannot reassign const. | JavaScript |
local index = 50 | local index = 50 | Correct. | Lua |
String c = 'output'; | String c = "output"; | Double quotes. | Java |
<person age=74> | <person age="74"> | Quote attribute. | XML |
for i=1,12 do print(i) end | for i=1,12 do print(i) end | Correct. | Lua |
let c: number | null = null; c.toFixed(66); | let c: number | null = null; if(c!==null) c.toFixed(66); | Null check. | TypeScript |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
class = 'message' | class_name = 'message' | 'class' is a keyword. | Python |
int[] arr = new int[13];
arr[13] = 5; | int[] arr = new int[13];
if (13 < arr.length) arr[13] = 5; | Check bounds. | Java |
if (y = 39) | if (y == 39) | Use ==. | R |
my @arr = (52,97,92); | my @arr = (52,97,92); | Correct. | Perl |
<center>result</center> | <div style='text-align:center;'>result</div> | Use CSS. | HTML |
<entry><desc>data</desc><desc>85</desc></entry | <entry><desc>data</desc><desc>85</desc></entry> | Add closing >. | XML |
SELECT * FROM items WHRE name=93; | SELECT * FROM items WHERE name=93; | Fix WHERE. | SQL |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(47); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('world')); app.listen(47, () => console.log('listening')); | Add callback. | Node.js |
a = test | a = 'test' | Quote strings. | Python |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
function foo() {{
return
{{key:'hello'}}
}} | function foo() {{
return {{key:'hello'}};
}} | Return object on same line. | JavaScript |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
values(91) | if length(values) >= 91, values(91), end | Check length. | MATLAB |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
if (data) console.log('yes') else console.log('no') | if (data) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
fmt.Println 'info' | fmt.Println('info') | Missing parentheses. | Go |
count = 90 | count=90 | No spaces. | Shell |
echo 'output' | echo 'output'; | Add semicolon. | PHP |
DELETE FROM orders WHERE email=48 | DELETE FROM orders WHERE email=48; | Add semicolon. | SQL |
'value' + 20 | 'value' + str(20) | Can't add int to string. | Python |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
["value", 87] | ["value", 87] | Correct. | JSON |
jwt.sign({{id:77}}, 'token'); | jwt.sign({{id:77}}, 'token', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
{{"value":"test" "age":19}} | {{"value":"test", "age":19}} | Add comma. | JSON |
80temp = 10 | temp80 = 10 | Variable cannot start with digit. | Python |
<input type='text' value='hello'> | <input type='text' value='hello' name='age'> | Add name attribute. | HTML |
$result = 71; if ($result = 71) {{}} | $result = 71; if ($result == 71) {{}} | Use ==. | PHP |
if a = 20 | if a == 20 | Use ==. | MATLAB |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
cin >> item
cout << item; | cin >> item;
cout << item; | Add semicolon. | C++ |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
class Order {{ int temp; }}
obj.temp=5; | class Order {{ public int temp; }}
obj.temp=5; | Make field public. | Java |
val c = 'hello' | val c = "hello" | Double quotes. | Kotlin |
'info' + 87 | 'info' + 87.to_s | Convert int. | Ruby |
handle | handle() | Add parentheses. | Kotlin |
String a = 'data'; | String a = "data"; | Double quotes. | Java |
if z = 2 | if z == 2 | Use ==. | Go |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
#header {{ color: green; }} | #header {{ color: green; }} | Correct. | CSS |
if (count = 53) {} | if (count == 53) {} | Use ==. | Dart |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
const z; | const z = 97; | Initialize const. | JavaScript |
<entry name='output'/> | <entry name="output"/> | Double quotes. | XML |
const http = require('http'); http.createServer((req,res) => res.end('result')).listen(88); | const http = require('http'); http.createServer((req,res) => res.end('result')).listen(88); | Correct. | Node.js |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
disp('data') | disp('data') | Correct. | MATLAB |
for i=1,54 do print(i) end | for i=1,54 do print(i) end | Correct. | Lua |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
render | render() | Add parentheses. | Swift |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
let index: number = 'result'; | let index: string = 'result'; | Fix type. | TypeScript |
<person age=70> | <person age="70"> | Quote attribute. | XML |
def bar(item):
return item + 1 | def bar(item):
return item + 1 | Correct. | Python |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
[61, 93, 56 | [61, 93, 56] | Close bracket. | Python |
name: test
age: hello, | name: test
age: hello | Remove comma. | YAML |
if num > 39
print('value') | if num > 39:
print('value') | Colon missing after if. | Python |
list[28] | if list.indices.contains(28) {{ list[28] }} | Check index. | Swift |
<hr></hr> | <hr> | Self-closing. | HTML |
def test():
print('world') | def test():
print('world') | Indent function body. | Python |
if num = 81: | if num == 81: | Use == for comparison. | Python |
<div color=#333> | <div style='color:#333;'> | Use style attribute. | CSS |
local val = 62 | local val = 62 | Correct. | Lua |
$values[41] = 5; | if (isset($values[41])) $values[41] = 5; | Check existence. | PHP |
<div><p>value</div></p> | <div><p>value</p></div> | Nest properly. | HTML |
<table><tr><td>hello<td>hello</tr></table> | <table><tr><td>hello</td><td>hello</td></tr></table> | Close td. | HTML |
object Person {{ def main(args: Array[String]) = println("info") }} | object Person {{ def main(args: Array[String]): Unit = println("info") }} | Add return type Unit. | Scala |
String name = 'result'; | String name = 'result'; | Correct. | Dart |
{{'age':'result'}} | {{"age":"result"}} | Use double quotes. | JSON |
for (int i=0; i<75; i++) {{}} | for (int i=0; i<75; i++) {{}} | Correct. | Java |
if ($count = 34) {{}} | if ($count -eq 34) {{}} | Use -eq. | PowerShell |
SELECT age status FROM orders; | SELECT age, status FROM orders; | Add comma. | SQL |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
x := 68 | x := 68 | Correct. | Go |
[4, 47, 44 | [4, 47, 44] | Close bracket. | Ruby |
if foo = 62 | if foo == 62 | Use ==. | Ruby |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
var x int | var x int | Correct. | Go |
function bar(b:string){{return b;}} bar(86); | function bar(b:string){{return b;}} bar('world'); | Pass correct type. | TypeScript |
if [ $y = 88 ]; then | if [ "$y" = 88 ]; then | Quote variable. | Shell |
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