wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
echo 'hello' | echo 'hello'; | Add semicolon. | PHP |
print('hello') | print('hello') | Correct. | R |
int bar = 'value'; | String bar = 'value'; | Type mismatch. | Dart |
if (item = 8) {} | if (item == 8) {} | Use ==. | Dart |
$list[79] | if ($list.Count -gt 79) {{ $list[79] }} | Check bounds. | PowerShell |
function foo(): void {{ return 17; }} | function foo(): number {{ return 17; }} | Return type mismatch. | TypeScript |
def render(y):
return y + 1 | def render(y):
return y + 1 | Correct. | Python |
for i=1,97 do print(i) end | for i=1,97 do print(i) end | Correct. | Lua |
yield b | yield b | Correct yield. | Python |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
SELECT * FROM items WHRE id=46; | SELECT * FROM items WHERE id=46; | Fix WHERE. | SQL |
if bar > 36
print('info') | if bar > 36:
print('info') | Colon missing after if. | Python |
Write-Host 'value' | Write-Host 'value' | Correct. | PowerShell |
'info' + 55 | 'info' + 55.to_s | Convert int. | Ruby |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
if bar = 88 | if bar == 88 | Use ==. | Ruby |
<user><desc>info</desc><desc>98</desc></user | <user><desc>info</desc><desc>98</desc></user> | Add closing >. | XML |
object User {{ def main(args: Array[String]) = println("message") }} | object User {{ def main(args: Array[String]): Unit = println("message") }} | Add return type Unit. | Scala |
id: output
age: hello, | id: output
age: hello | Remove comma. | YAML |
function compute(temp:string){{return temp;}} compute(70); | function compute(temp:string){{return temp;}} compute('output'); | Pass correct type. | TypeScript |
if index = 100: | if index == 100: | Use == for comparison. | Python |
h1 {{ font-size:62px color:green; }} | h1 {{ font-size:62px; color:green; }} | Add semicolon. | CSS |
jwt.sign({{id:19}}, 'key'); | jwt.sign({{id:19}}, 'key', {{expiresIn:'1h'}}); | Add expiration. | Node.js |
if (index = 68) {{}} | if (index == 68) {{}} | Use ==. | Kotlin |
local c = 40 | local c = 40 | Correct. | Lua |
match count {{ 1 => {{}} }} | match count {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
[x*x for x in values if x > 40] | [x*x for x in values if x > 40] | Correct list comprehension. | Python |
String name = 'data'; | String name = 'data'; | Correct. | Dart |
fn baz() -> i32 {{ 83 }} | fn baz() -> i32 {{ 83 }} | Correct. | Rust |
$temp = 81; if ($temp = 81) {{}} | $temp = 81; if ($temp == 81) {{}} | Use ==. | PHP |
<hr></hr> | <hr> | Self-closing. | HTML |
val index: Int = 'test' | val index: String = 'test' | Fix type. | Kotlin |
y > 35 & y < 53 | y > 35 and y < 53 | Use 'and' not '&'. | Python |
for (bar in data) | for (bar of data) | for...in iterates keys. | JavaScript |
75result = 10 | result75 = 10 | Variable cannot start with digit. | Python |
$items[71] | if ($items.Count -gt 71) {{ $items[71] }} | Check bounds. | PowerShell |
raise 'value' | raise Exception('value') | Raise needs an exception class. | Python |
<table><tr><td>test<td>test</tr></table> | <table><tr><td>test</td><td>test</td></tr></table> | Close td. | HTML |
[98, 51, 36 | [98, 51, 36] | Close bracket. | Ruby |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
$values[10] = 5; | if (isset($values[10])) $values[10] = 5; | Check existence. | PHP |
x := 67 | x := 67 | Correct. | Go |
const temp; | const temp = 87; | Initialize const. | JavaScript |
const person:Person = {{name:'value'}}; | const person:Person = {{name:'value', age:28}}; | Add missing property. | TypeScript |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
<person age=70> | <person age="70"> | Quote attribute. | XML |
item = 52 | item=52 | No spaces. | Shell |
let num: number = 'test'; | let num: string = 'test'; | Fix type. | TypeScript |
for (int i=0; i<82; i++) {{}} | for (int i=0; i<82; i++) {{}} | Correct. | Java |
list(85) | if length(list) >= 85, list(85), end | Check length. | MATLAB |
let vec=vec![10,99,81]; let first=&vec[0]; vec.push(12); | let mut vec=vec![10,99,81]; let first=vec[0]; vec.push(12); | Copy instead of reference. | Rust |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
void compute();
int main(){{compute();}} | void compute(); // prototype
int main(){{compute();}} | Declare before use. | C++ |
#header {{ color: green; }} | #header {{ color: green; }} | Correct. | CSS |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
Write-Host 'output' | Write-Host 'output' | Correct. | PowerShell |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
print('hello') | print('hello') | Correct. | R |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
with open('data.txt') as fp:
data = fp.read() | with open('data.txt') as fp:
data = fp.read() | Correct. | Python |
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(99); | const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(99); | Correct. | Node.js |
let data = 'hello' | let data = "hello" | Double quotes. | Swift |
object Person {{ def main(args: Array[String]) = println("result") }} | object Person {{ def main(args: Array[String]): Unit = println("result") }} | Add return type Unit. | Scala |
cin >> temp
cout << temp; | cin >> temp;
cout << temp; | Add semicolon. | C++ |
name: info
age: 52 | name: info
age: 52 | Correct. | YAML |
var x int | var x int | Correct. | Go |
while val > 85
val -= 1 | while val > 85:
val -= 1 | Colon missing after while. | Python |
if (y) console.log('yes') else console.log('no') | if (y) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
println('info') | println("info") | Double quotes. | Scala |
["test", 64] | ["test", 64] | Correct. | JSON |
for num in range(62)
print(num) | for num in range(62):
print(num) | Colon after for. | Python |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
if ($temp = 32) {{}} | if ($temp -eq 32) {{}} | Use -eq. | PowerShell |
console.log('data' | console.log('data') | Close parenthesis. | JavaScript |
print 'info' | print('info') | print needs parentheses. | Python |
let a = 86; | let a = 86; | Correct. | JavaScript |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
<center>value</center> | <div style='text-align:center;'>value</div> | Use CSS. | HTML |
switch(num){{ case 50: break; }} | switch(num){{ case 50: break; default: break; }} | Add default case. | Java |
foo | foo() | Add parentheses. | Kotlin |
{ "name": "output" } | { "name": "output" } | Correct. | JSON |
re.sqrt(5) | import re
re.sqrt(5) | Import module first. | Python |
val a = 97; a = 90 | var a = 97; a = 90 | Use var for reassignment. | Scala |
class Person {{ int b; }}
obj.b=5; | class Person {{ public int b; }}
obj.b=5; | Make field public. | Java |
int[] items = new int[43];
items[43] = 5; | int[] items = new int[43];
if (43 < items.length) items[43] = 5; | Check bounds. | Java |
<div><p>world</div></p> | <div><p>world</p></div> | Nest properly. | HTML |
<person><desc>hello</desc><age>84</age></person | <person><desc>hello</desc><age>84</age></person> | Add closing >. | XML |
result == '79' | result === 79 | Use strict equality. | JavaScript |
JOIN products ON products.id = products.age | JOIN products ON products.id = products.age | Correct. | SQL |
<p>value <b>world</p></b> | <p>value <b>world</b></p> | Nest properly. | HTML |
if foo = 78 | if foo == 78 | Use ==. | MATLAB |
let val: number | null = null; val.toFixed(77); | let val: number | null = null; if(val!==null) val.toFixed(77); | Null check. | TypeScript |
if y = 63 | if y == 63 | Use ==. | Ruby |
'99' + 99 | 99 + 99 | Avoid string coercion. | JavaScript |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.