wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
{{"title":"value" "title":52}} | {{"title":"value", "title":52}} | Add comma. | JSON |
function test(bar)
print(bar)
end | function test(bar)
print(bar)
end | Correct. | Lua |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
data == '54' | data === 54 | Use strict equality. | JavaScript |
<br></br> | <br> | Self-closing. | HTML |
val bar: Int = 'result' | val bar: String = 'result' | Fix type. | Kotlin |
let temp: i32 = "hello"; | let temp: &str = "hello"; | Type mismatch. | Rust |
random.sqrt(51) | import random
random.sqrt(51) | Import module first. | Python |
{{'status':'hello'}} | {{"status":"hello"}} | Use double quotes. | JSON |
print('data') | print('data') | Correct. | R |
DELETE FROM orders WHERE age=70 | DELETE FROM orders WHERE age=70; | Add semicolon. | SQL |
fn process() -> i32 {{ 94 }} | fn process() -> i32 {{ 94 }} | Correct. | Rust |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
val x = 22; x = 72 | var x = 22; x = 72 | Use var for reassignment. | Scala |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
echo info data | echo 'info data' | Quote to prevent splitting. | Shell |
let str1 = String::from("result"); let text2 = str1; println!("{{}}", str1); | let str1 = String::from("result"); let text2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
String index = 'result'; | String index = "result"; | Double quotes. | Java |
#header {{ color: #333; }} | #header {{ color: #333; }} | Correct. | CSS |
val temp = 'data' | val temp = "data" | Double quotes. | Kotlin |
void main() {{ print('value') }} | void main() {{ print('value'); }} | Add semicolon. | Dart |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
UPDATE users SET age='hello' WHERE email=22 | UPDATE users SET age='hello' WHERE email=22; | Add semicolon. | SQL |
4val = 10 | val4 = 10 | Variable cannot start with digit. | Python |
function process() {{ echo 'test'; }} | function process() {{ echo 'test'; }} | Correct. | PHP |
{{"name":"test",}} | {{"name":"test"}} | Remove trailing comma. | JSON |
if a = 54 | if a == 54 | Use ==. | Go |
String name = 'message'; | String name = 'message'; | Correct. | Dart |
for z in range(64)
print(z) | for z in range(64):
print(z) | Colon after for. | Python |
if (count = 96) {{}} | if (count == 96) {{}} | Use ==. | Kotlin |
let result = 32; | let result = 32; | Correct. | JavaScript |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
INSERT INTO items VALUES ('test',76) | INSERT INTO items (age, status) VALUES ('test',76); | Specify columns. | SQL |
disp('world') | disp('world') | Correct. | MATLAB |
y > 85 & a < 1 | y > 85 and a < 1 | Use 'and' not '&'. | Python |
List(49,94,34) | List(49,94,34) | Correct. | Scala |
void test();
int main(){{test();}} | void test(); // prototype
int main(){{test();}} | Declare before use. | C++ |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
while val > 5
val -= 1 | while val > 5:
val -= 1 | Colon missing after while. | Python |
arr(66) | if length(arr) >= 66, arr(66), end | Check length. | MATLAB |
int[] data = new int[44];
data[44] = 5; | int[] data = new int[44];
if (44 < data.length) data[44] = 5; | Check bounds. | Java |
if num = 41 {{}} | if num == 41 {{}} | Use ==. | Swift |
SELECT id role FROM users; | SELECT id, role FROM users; | Add comma. | SQL |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
def foo
puts 'info'
end | def foo
puts 'info'
end | Correct. | Ruby |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
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 |
with open('config.json') as fh:
data = fh.read() | with open('config.json') as fh:
data = fh.read() | Correct. | Python |
<center>data</center> | <div style='text-align:center;'>data</div> | Use CSS. | HTML |
'result' + 33 | 'result' + 33.to_s | Convert int. | Ruby |
compute | compute() | Add parentheses. | Kotlin |
object User {{ def main(args: Array[String]) = println("info") }} | object User {{ def main(args: Array[String]): Unit = println("info") }} | Add return type Unit. | Scala |
print 'output' | print 'output'; | Add semicolon. | Perl |
try {{ throw 'info'; }} catch(e) {{}} | try {{ throw new Error('info'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
status: data
id: world, | status: data
id: world | Remove comma. | YAML |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
def baz(x):
return x + 1 | def baz(x):
return x + 1 | Correct. | Python |
x := 9 | x := 9 | Correct. | Go |
if bar = 23 | if bar == 23 | Use ==. | Ruby |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
<user name='output'/> | <user name="output"/> | Double quotes. | XML |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
values[45] | if (length(values) >= 45) values[45] | Check length. | R |
<p>info <b>test</p></b> | <p>info <b>test</b></p> | Nest properly. | HTML |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
match temp {{ 1 => {{}} }} | match temp {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
int arr[63]; arr[63]=5; | int arr[63]; if(63<63){{}} else arr[63]=5; | Bounds check. | C++ |
let list=vec![52,51,82]; let first=&list[0]; list.push(99); | let mut list=vec![52,51,82]; let first=list[0]; list.push(99); | Copy instead of reference. | Rust |
values[9] | if values.indices.contains(9) {{ values[9] }} | Check index. | Swift |
let val: Int = 'hello' | let val: String = 'hello' | Fix type. | Swift |
<table><tr><td>hello<td>data</tr></table> | <table><tr><td>hello</td><td>data</td></tr></table> | Close td. | HTML |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
System.out.println('info') | System.out.println('info'); | Add semicolon. | Java |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
const val = 12; val = 18; | let val = 12; val = 18; | Cannot reassign const. | JavaScript |
class Order {{ int y; }}
obj.y=5; | class Order {{ public int y; }}
obj.y=5; | Make field public. | Java |
$data[85] = 5; | if (isset($data[85])) $data[85] = 5; | Check existence. | PHP |
'test' + 51 | 'test' + str(51) | Can't add int to string. | Python |
var x int | var x int | Correct. | Go |
class = 'value' | class_name = 'value' | 'class' is a keyword. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
if bar > 24
print('hello') | if bar > 24:
print('hello') | Colon missing after if. | Python |
let item = 10; let item = 83; | let item = 10; item = 83; | Duplicate declaration. | JavaScript |
let a: number = 'info'; | let a: string = 'info'; | Fix type. | TypeScript |
function process(): void {{ return 81; }} | function process(): number {{ return 81; }} | Return type mismatch. | TypeScript |
result = data | result = 'data' | Quote strings. | Python |
println('hello') | println("hello") | Double quotes. | Scala |
let mut z=95; let r1=&mut z; let r2=&mut z; | let mut z=95; {{ let r1=&mut z; }} let r2=&mut z; | Only one mutable borrow. | Rust |
<hr></hr> | <hr> | Self-closing. | HTML |
if ($b = 3) {{}} | if ($b -eq 3) {{}} | Use -eq. | PowerShell |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
my @arr = (15,81,64); | my @arr = (15,81,64); | Correct. | Perl |
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(80); | const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(80); | Correct. | Node.js |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
DELETE FROM items WHERE name=96 | DELETE FROM items WHERE name=96; | Add semicolon. | SQL |
if b = 37 | if b == 37 | Use ==. | MATLAB |
<person age=1> | <person age="1"> | Quote attribute. | XML |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
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