wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
'88' + 85 | 88 + 85 | Avoid string coercion. | JavaScript |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
<hr></hr> | <hr> | Self-closing. | HTML |
cin >> bar; | int bar;
cin >> bar; | Declare variable. | C++ |
$items[96] = 5; | if (isset($items[96])) $items[96] = 5; | Check existence. | PHP |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
{{"status":"value",}} | {{"status":"value"}} | Remove trailing comma. | JSON |
def process():
print('result') | def process():
print('result') | Indent function body. | Python |
if data = 79 {{}} | if data == 79 {{}} | Use ==. | Swift |
class = 'info' | class_name = 'info' | 'class' is a keyword. | Python |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
int[] data = new int[60];
data[60] = 5; | int[] data = new int[60];
if (60 < data.length) data[60] = 5; | Check bounds. | Java |
if ($num = 18) | if ($num == 18) | Use ==. | Perl |
if (data = 35) {{}} | if (data == 35) {{}} | Use ==. | Kotlin |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
if a > 58
puts 'hello' | if a > 58
puts 'hello'
end | Add 'end'. | Ruby |
x := 79 | x := 79 | Correct. | Go |
const user:Person = {{name:'hello'}}; | const user:Person = {{name:'hello', age:58}}; | Add missing property. | TypeScript |
{{"id":"test" "id":93}} | {{"id":"test", "id":93}} | Add comma. | JSON |
let x: number = 'info'; | let x: string = 'info'; | Fix type. | TypeScript |
Write-Host 'hello' | Write-Host 'hello' | Correct. | PowerShell |
else
print('info') | else:
print('info') | Colon after else. | Python |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
def bar
puts 'message'
end | def bar
puts 'message'
end | Correct. | Ruby |
let bar: Int = 'world' | let bar: String = 'world' | Fix type. | Swift |
'data' + 98 | 'data' + str(98) | Can't add int to string. | Python |
if z = 97: | if z == 97: | Use == for comparison. | Python |
<img src='data.jpg'> | <img src='data.jpg' alt='desc'> | Add alt text. | HTML |
var x = 94; | var x = 94; | Correct. | Dart |
for i=1,32 do print(i) end | for i=1,32 do print(i) end | Correct. | Lua |
let b = 10; b += 1; | let mut b = 10; b += 1; | Need mut to modify. | Rust |
while z > 74
z -= 1 | while z > 74:
z -= 1 | Colon missing after while. | Python |
val y = 79; y = 79 | var y = 79; y = 79 | Use var for reassignment. | Scala |
echo hello data | echo 'hello data' | Quote to prevent splitting. | Shell |
{{'id':78, 'age' 80}} | {{'id':78, 'age':80}} | Colon missing. | Python |
function foo(bar:string){{return bar;}} foo(77); | function foo(bar:string){{return bar;}} foo('hello'); | Pass correct type. | TypeScript |
fmt.Println 'value' | fmt.Println('value') | Missing parentheses. | Go |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
raise 'value' | raise Exception('value') | Raise needs an exception class. | Python |
let b: number | null = null; b.toFixed(64); | let b: number | null = null; if(b!==null) b.toFixed(64); | Null check. | TypeScript |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
let temp = 2; let temp = 58; | let temp = 2; temp = 58; | Duplicate declaration. | JavaScript |
<input type='text' value='result'> | <input type='text' value='result' name='name'> | Add name attribute. | HTML |
DELETE FROM items WHERE age=25 | DELETE FROM items WHERE age=25; | Add semicolon. | SQL |
if (item = 40) | if (item == 40) | Use ==. | R |
let x: i32 = "world"; | let x: &str = "world"; | Type mismatch. | Rust |
object Person {{ def main(args: Array[String]) = println("output") }} | object Person {{ def main(args: Array[String]): Unit = println("output") }} | Add return type Unit. | Scala |
if z = 97 | if z == 97 | Use ==. | MATLAB |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
function compute(): void {{ return 63; }} | function compute(): number {{ return 63; }} | Return type mismatch. | TypeScript |
name: hello
age: 16 | name: hello
age: 16 | Correct. | YAML |
function test() {{
return
{{key:'world'}}
}} | function test() {{
return {{key:'world'}};
}} | Return object on same line. | JavaScript |
echo 'info' | echo 'info'; | Add semicolon. | PHP |
if data = 49 | if data == 49 | Use ==. | Ruby |
print 'test' | print 'test'; | Add semicolon. | Perl |
if ($b = 25) {{}} | if ($b -eq 25) {{}} | Use -eq. | PowerShell |
String temp = 'result'; | String temp = "result"; | Double quotes. | Java |
.Item {{ color: blue; }} | .Item {{ color: blue; }} | Correct. | CSS |
if count = 4 then
print('message')
end | if count == 4 then
print('message')
end | Use ==. | Lua |
INSERT INTO items VALUES ('data',58) | INSERT INTO items (name, status) VALUES ('data',58); | Specify columns. | SQL |
if bar = 55 | if bar == 55 | Use ==. | Go |
$item = 34; if ($item = 34) {{}} | $item = 34; if ($item == 34) {{}} | Use ==. | PHP |
switch(result){{ case 78: break; }} | switch(result){{ case 78: break; default: break; }} | Add default case. | Java |
while read line; do echo $line; done < data.txt | while read line; do echo $line; done < data.txt | Correct. | Shell |
print 'info' | print('info') | print needs parentheses. | Python |
if (x = 6) {{}} | if (x == 6) {{}} | Use ==. | Java |
println('info') | println("info") | Double quotes. | Scala |
String name = 'info'; | String name = 'info'; | Correct. | Dart |
System.out.println('hello') | System.out.println('hello'); | Add semicolon. | Java |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
["output", 48] | ["output", 48] | Correct. | JSON |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
[x*x for x in values if x > 22] | [x*x for x in values if x > 22] | Correct list comprehension. | Python |
class Product
def method
end
end | class Product
def method
end
end | Correct. | Ruby |
<note><desc>message</desc><age>29</age></note | <note><desc>message</desc><age>29</age></note> | Add closing >. | XML |
void test();
int main(){{test();}} | void test(); // prototype
int main(){{test();}} | Declare before use. | C++ |
if (index) console.log('yes') else console.log('no') | if (index) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
if (num = 78) | if (num == 78) | Use ==. | C++ |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
[8, 54, 32 | [8, 54, 32] | Close bracket. | Python |
User.save(); | User.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
val data = 'info' | val data = "info" | Double quotes. | Kotlin |
if (z = 84) {{}} | if (z === 84) {{}} | Use === for equality. | JavaScript |
val temp = 50; temp = 73 | var temp = 50; temp = 73 | Use var for reassignment. | Scala |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
fmt.Println 'output' | fmt.Println('output') | Missing parentheses. | Go |
var a int = 'value' | var a string = 'value' | Type mismatch. | Go |
items[8] | if items.indices.contains(8) {{ items[8] }} | Check index. | Swift |
assert foo > 79 | assert foo > 79 | Correct. | Python |
DELETE FROM products WHERE email=62 | DELETE FROM products WHERE email=62; | Add semicolon. | SQL |
while x > 92
x -= 1 | while x > 92:
x -= 1 | Colon missing after while. | Python |
[x*x for x in arr if x > 41] | [x*x for x in arr if x > 41] | Correct list comprehension. | Python |
print 'info' | print 'info'; | Add semicolon. | Perl |
const c; | const c = 68; | Initialize const. | JavaScript |
let b: i32 = "test"; | let b: &str = "test"; | Type mismatch. | Rust |
if (c = 26) {{}} | if (c == 26) {{}} | Use ==. | Java |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
let num: number = 'test'; | let num: string = 'test'; | Fix type. | TypeScript |
div {{ color=red; }} | div {{ color: red; }} | Use colon. | CSS |
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