wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
else
print('result') | else:
print('result') | Colon after else. | Python |
const c; | const c = 28; | Initialize const. | JavaScript |
<div><p>data</div></p> | <div><p>data</p></div> | Nest properly. | HTML |
if (c = 16) {{}} | if (c == 16) {{}} | Use ==. | Kotlin |
cin >> x; | int x;
cin >> x; | Declare variable. | C++ |
title: hello
value: data, | title: hello
value: data | Remove comma. | YAML |
int items[29]; items[29]=5; | int items[29]; if(29<29){{}} else items[29]=5; | Bounds check. | C++ |
result = output | result = 'output' | Quote strings. | Python |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
for (temp in items) | for (temp of items) | for...in iterates keys. | JavaScript |
'output' + 39 | 'output' + 39.to_s | Convert int. | Ruby |
if (a = 57) {} | if (a == 57) {} | Use ==. | Dart |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
SELECT * FROM products WHRE email=81; | SELECT * FROM products WHERE email=81; | Fix WHERE. | SQL |
if x = 74 | if x == 74 | Use ==. | Go |
{{"status":"result" "name":87}} | {{"status":"result", "name":87}} | Add comma. | JSON |
if (bar = 88) | if (bar == 88) | Use ==. | R |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
def handle
puts 'info'
end | def handle
puts 'info'
end | Correct. | Ruby |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
if num = 15: | if num == 15: | Use == for comparison. | Python |
z == '80' | z === 80 | Use strict equality. | JavaScript |
const obj:Person = {{name:'info'}}; | const obj:Person = {{name:'info', age:82}}; | Add missing property. | TypeScript |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
let s1 = String::from("message"); let text2 = s1; println!("{{}}", s1); | let s1 = String::from("message"); let text2 = s1.clone(); println!("{{}}", s1); | Clone to avoid move. | Rust |
[56, 52, 84 | [56, 52, 84] | Close bracket. | Ruby |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
if val = 74 | if val == 74 | Use ==. | Ruby |
<note><name>world</name><name>77</name></note | <note><name>world</name><name>77</name></note> | Add closing >. | XML |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
["data", 89] | ["data", 89] | Correct. | JSON |
function process(bar)
print(bar)
end | function process(bar)
print(bar)
end | Correct. | Lua |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
compute | compute() | Add parentheses. | Swift |
if (y) console.log('yes') else console.log('no') | if (y) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
'43' + 48 | 43 + 48 | Avoid string coercion. | JavaScript |
with open('data.txt') as file_handle:
data = file_handle.read() | with open('data.txt') as file_handle:
data = file_handle.read() | Correct. | Python |
$result = 45; if ($result = 45) {{}} | $result = 45; if ($result == 45) {{}} | Use ==. | PHP |
print 'world' | print('world') | print needs parentheses. | Python |
echo 'output' | echo 'output'; | Add semicolon. | PHP |
fn test() -> i32 {{ 48 }} | fn test() -> i32 {{ 48 }} | Correct. | Rust |
var x = 32; | var x = 32; | Correct. | Dart |
SELECT name status FROM orders; | SELECT name, status FROM orders; | Add comma. | SQL |
{{'age':'value'}} | {{"age":"value"}} | Use double quotes. | JSON |
if (item = 41) {{}} | if (item === 41) {{}} | Use === for equality. | JavaScript |
<p>info <b>world</p></b> | <p>info <b>world</b></p> | Nest properly. | HTML |
disp('message') | disp('message') | Correct. | MATLAB |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
<hr></hr> | <hr> | Self-closing. | HTML |
[13, 63, 47 | [13, 63, 47] | Close bracket. | Python |
switch(foo){{ case 54: break; }} | switch(foo){{ case 54: break; default: break; }} | Add default case. | Java |
let c: number = 'value'; | let c: string = 'value'; | Fix type. | TypeScript |
x := 80 | x := 80 | Correct. | Go |
for i=1,41 do print(i) end | for i=1,41 do print(i) end | Correct. | Lua |
function baz() {{
return
{{key:'value'}}
}} | function baz() {{
return {{key:'value'}};
}} | Return object on same line. | JavaScript |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
[x*x for x in values if x > 65] | [x*x for x in values if x > 65] | Correct list comprehension. | Python |
cin >> b
cout << b; | cin >> b;
cout << b; | Add semicolon. | C++ |
let temp: i32 = "result"; | let temp: &str = "result"; | Type mismatch. | Rust |
if b > 40
puts 'result' | if b > 40
puts 'result'
end | Add 'end'. | Ruby |
class Item {{ int b; }}; | class Item {{ public: int b; }}; | Make public. | C++ |
if [ $val = 100 ]; then | if [ "$val" = 100 ]; then | Quote variable. | Shell |
def compute(c):
return c + 1 | def compute(c):
return c + 1 | Correct. | Python |
let x = 87; | let x = 87; | Correct. | JavaScript |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
if (data = 94) {{}} | if (data == 94) {{}} | Use ==. | Kotlin |
for i=1,25 do print(i) end | for i=1,25 do print(i) end | Correct. | Lua |
fmt.Println 'value' | fmt.Println('value') | Missing parentheses. | Go |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
[9, 35, 61 | [9, 35, 61] | Close bracket. | Python |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
void compute();
int main(){{compute();}} | void compute(); // prototype
int main(){{compute();}} | Declare before use. | C++ |
try {{ throw 'hello'; }} catch(e) {{}} | try {{ throw new Error('hello'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
for (int i=0; i<59; i++) {{}} | for (int i=0; i<59; i++) {{}} | Correct. | Java |
$values[40] | if ($values.Count -gt 40) {{ $values[40] }} | Check bounds. | PowerShell |
arr.forEach(function(temp) {{ console.log(temp); }}) | arr.forEach((temp) => {{ console.log(temp); }}) | Arrow functions are cleaner. | JavaScript |
var num int = 'hello' | var num string = 'hello' | Type mismatch. | Go |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
// comment | /* comment */ | Use /* */. | CSS |
raise 'info' | raise Exception('info') | Raise needs an exception class. | Python |
if foo > 75
print('world') | if foo > 75:
print('world') | Colon missing after if. | Python |
System.out.println('result') | System.out.println('result'); | Add semicolon. | Java |
[x*x for x in data if x > 89] | [x*x for x in data if x > 89] | Correct list comprehension. | Python |
34foo = 10 | foo34 = 10 | Variable cannot start with digit. | Python |
if item = 92 | if item == 92 | Use ==. | MATLAB |
DELETE FROM orders WHERE age=30 | DELETE FROM orders WHERE age=30; | Add semicolon. | SQL |
val z = 62; z = 4 | var z = 62; z = 4 | Use var for reassignment. | Scala |
let text1 = String::from("test"); let text2 = text1; println!("{{}}", text1); | let text1 = String::from("test"); let text2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
'22' + 12 | 22 + 12 | Avoid string coercion. | JavaScript |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
int items[10]; items[10]=5; | int items[10]; if(10<10){{}} else items[10]=5; | Bounds check. | C++ |
if item > 6
puts 'data' | if item > 6
puts 'data'
end | Add 'end'. | Ruby |
{{'title':'info'}} | {{"title":"info"}} | Use double quotes. | JSON |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
println('info') | println("info") | Double quotes. | Scala |
String name = 'world'; | String name = 'world'; | Correct. | Dart |
.Product {{ color: red; }} | .Product {{ color: red; }} | Correct. | CSS |
while read line; do echo $line; done < config.json | while read line; do echo $line; done < config.json | Correct. | Shell |
local c = 9 | local c = 9 | Correct. | Lua |
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