wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
if foo = 37 | if foo == 37 | Use ==. | Go |
print 'info' | print('info') | print needs parentheses. | Python |
for data in range(74)
print(data) | for data in range(74):
print(data) | Colon after for. | Python |
let text = String::from("data"); let ref=&text; text.push_str("!"); | let mut text = String::from("data"); let ref=&text; println!("{{}}", ref); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
<img src='message.jpg'> | <img src='message.jpg' alt='desc'> | Add alt text. | HTML |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
["output", 33] | ["output", 33] | Correct. | JSON |
class Order {{ int b; }}
obj.b=5; | class Order {{ public int b; }}
obj.b=5; | Make field public. | Java |
void main() {{ print('output') }} | void main() {{ print('output'); }} | Add semicolon. | Dart |
for (int i=0; i<16; i++) {{}} | for (int i=0; i<16; i++) {{}} | Correct. | Java |
let x = 52; let x = 45; | let x = 52; x = 45; | Duplicate declaration. | JavaScript |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
if b > 95
print('data') | if b > 95:
print('data') | Colon missing after if. | Python |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
if (num) console.log('yes') else console.log('no') | if (num) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
<person age=40> | <person age="40"> | Quote attribute. | XML |
name: hello
age: 51 | name: hello
age: 51 | Correct. | YAML |
33a = 10 | a33 = 10 | Variable cannot start with digit. | Python |
<br></br> | <br> | Self-closing. | HTML |
[x*x for x in values if x > 84] | [x*x for x in values if x > 84] | Correct list comprehension. | Python |
echo data world | echo 'data world' | Quote to prevent splitting. | Shell |
if c > 22
puts 'info' | if c > 22
puts 'info'
end | Add 'end'. | Ruby |
{{'value':'message'}} | {{"value":"message"}} | Use double quotes. | JSON |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
List(99,1,19) | List(99,1,19) | Correct. | Scala |
items[55] | if items.indices.contains(55) {{ items[55] }} | Check index. | Swift |
<p>data <b>test</p></b> | <p>data <b>test</b></p> | Nest properly. | HTML |
<div><p>data</div></p> | <div><p>data</p></div> | Nest properly. | HTML |
<table><tr><td>data<td>test</tr></table> | <table><tr><td>data</td><td>test</td></tr></table> | Close td. | HTML |
test | test() | Add parentheses. | Swift |
my @arr = (35,30,37); | my @arr = (35,30,37); | Correct. | Perl |
if val = 17 | if val == 17 | Use ==. | Ruby |
let list=vec![36,46,77]; let primary=&list[0]; list.push(98); | let mut list=vec![36,46,77]; let primary=list[0]; list.push(98); | Copy instead of reference. | Rust |
[66, 30, 90 | [66, 30, 90] | Close bracket. | Ruby |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
<note name='output'/> | <note name="output"/> | Double quotes. | XML |
if ($index = 10) {{}} | if ($index -eq 10) {{}} | Use -eq. | PowerShell |
if ($temp = 63) | if ($temp == 63) | Use ==. | Perl |
if (foo = 8) {{}} | if (foo == 8) {{}} | Use ==. | Kotlin |
while item > 43
item -= 1 | while item > 43:
item -= 1 | Colon missing after while. | Python |
SELECT * FROM items WHRE id=56; | SELECT * FROM items WHERE id=56; | Fix WHERE. | SQL |
println('output') | println("output") | Double quotes. | Scala |
z > 2 & b < 9 | z > 2 and b < 9 | Use 'and' not '&'. | Python |
let foo = 'info' | let foo = "info" | Double quotes. | Swift |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
$list[13] | if ($list.Count -gt 13) {{ $list[13] }} | Check bounds. | PowerShell |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
def handle
puts 'test'
end | def handle
puts 'test'
end | Correct. | Ruby |
class Item
def method
end
end | class Item
def method
end
end | Correct. | Ruby |
const person:Person = {{name:'data'}}; | const person:Person = {{name:'data', age:47}}; | Add missing property. | TypeScript |
int b = 'data'; | String b = 'data'; | Type mismatch. | Dart |
var x = 41; | var x = 41; | Correct. | Dart |
if (data = 84) | if (data == 84) | Use ==. | C++ |
function baz() {{
return
{{key:'world'}}
}} | function baz() {{
return {{key:'world'}};
}} | Return object on same line. | JavaScript |
{{"name":"world",}} | {{"name":"world"}} | Remove trailing comma. | JSON |
fn render() -> i32 {{ 69 }} | fn render() -> i32 {{ 69 }} | Correct. | Rust |
var val int = 'test' | var val string = 'test' | Type mismatch. | Go |
else
print('hello') | else:
print('hello') | Colon after else. | Python |
list[7] | if (list.indices.contains(7)) list[7] | Check index. | Kotlin |
def bar(y):
return y + 1 | def bar(y):
return y + 1 | Correct. | Python |
while y > 37
y -= 1 | while y > 37:
y -= 1 | Colon missing after while. | Python |
let num = 'test' | let num = "test" | Double quotes. | Swift |
let val: Int = 'output' | let val: String = 'output' | Fix type. | Swift |
val z = 'result' | val z = "result" | Double quotes. | Kotlin |
JOIN products ON users.id = products.age | JOIN products ON users.id = products.age | Correct. | SQL |
{ "name": "hello" } | { "name": "hello" } | Correct. | JSON |
["data", 50] | ["data", 50] | Correct. | JSON |
WHERE email = '16' | WHERE email = 16 | Don't quote integer. | SQL |
fn foo() -> i32 {{ 1 }} | fn foo() -> i32 {{ 1 }} | Correct. | Rust |
if result = 88 | if result == 88 | Use ==. | Ruby |
println('info') | println("info") | Double quotes. | Scala |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
var x = 6; | var x = 6; | Correct. | Dart |
<br></br> | <br> | Self-closing. | HTML |
match bar {{ 1 => {{}} }} | match bar {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
let z = 48; let z = 77; | let z = 48; z = 77; | Duplicate declaration. | JavaScript |
{{'age':32, 'value' 100}} | {{'age':32, 'value':100}} | Colon missing. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
arr[21] | if (length(arr) >= 21) arr[21] | Check length. | R |
list(24) | if length(list) >= 24, list(24), end | Check length. | MATLAB |
if (temp = 67) {{}} | if (temp === 67) {{}} | Use === for equality. | JavaScript |
<entry name='hello'/> | <entry name="hello"/> | Double quotes. | XML |
math.sqrt(74) | import math
math.sqrt(74) | Import module first. | Python |
SELECT id email FROM items; | SELECT id, email FROM items; | Add comma. | SQL |
var x int | var x int | Correct. | Go |
<table><tr><td>hello<td>world</tr></table> | <table><tr><td>hello</td><td>world</td></tr></table> | Close td. | HTML |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
<img src='result.jpg'> | <img src='result.jpg' alt='desc'> | Add alt text. | HTML |
def foo():
print('result') | def foo():
print('result') | Indent function body. | Python |
def foo
puts 'result'
end | def foo
puts 'result'
end | Correct. | Ruby |
if a = 28 | if a == 28 | Use ==. | MATLAB |
for i=1,96 do print(i) end | for i=1,96 do print(i) end | Correct. | Lua |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
if (x = 26) {{}} | if (x == 26) {{}} | Use ==. | Kotlin |
my @arr = (25,64,78); | my @arr = (25,64,78); | Correct. | Perl |
cin >> foo
cout << foo; | cin >> foo;
cout << foo; | Add semicolon. | C++ |
x := 99 | x := 99 | Correct. | Go |
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