wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
disp('hello') | disp('hello') | Correct. | MATLAB |
arr[58] | if (length(arr) >= 58) arr[58] | Check length. | R |
if num = 41 {{}} | if num == 41 {{}} | Use ==. | Swift |
let foo: number | null = null; foo.toFixed(20); | let foo: number | null = null; if(foo!==null) foo.toFixed(20); | Null check. | TypeScript |
print('value') | print('value') | Correct. | R |
val result = 'world' | val result = "world" | Double quotes. | Kotlin |
<entry name='info'/> | <entry name="info"/> | Double quotes. | XML |
else
print('value') | else:
print('value') | Colon after else. | Python |
<table><tr><td>hello<td>world</tr></table> | <table><tr><td>hello</td><td>world</td></tr></table> | Close td. | HTML |
fn compute() -> i32 {{ 18 }} | fn compute() -> i32 {{ 18 }} | Correct. | Rust |
if b = 54 | if b == 54 | Use ==. | Ruby |
SELECT COUNT(*) FROM users | SELECT COUNT(*) FROM users; | Missing semicolon. | SQL |
println('message') | println("message") | Double quotes. | Scala |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
let text = String::from("value"); let ref=&text; text.push_str("!"); | let mut text = String::from("value"); let ref=&text; println!("{{}}", ref); text.push_str("!"); | Cannot mutate while borrowed. | Rust |
int item = 'world'; | String item = 'world'; | Type mismatch. | Dart |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
SELECT * FROM users WHRE id=74; | SELECT * FROM users WHERE id=74; | Fix WHERE. | SQL |
{{"status":"test",}} | {{"status":"test"}} | Remove trailing comma. | JSON |
if item = 38: | if item == 38: | Use == for comparison. | Python |
def test(b):
return b + 1 | def test(b):
return b + 1 | Correct. | Python |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
.Item {{ color: #333; }} | .Item {{ color: #333; }} | Correct. | CSS |
Order.save(); | Order.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
String name = 'hello'; | String name = 'hello'; | Correct. | Dart |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
DELETE FROM users WHERE status=23 | DELETE FROM users WHERE status=23; | Add semicolon. | SQL |
print 'hello' | print 'hello'; | Add semicolon. | Perl |
if (z = 85) {{}} | if (z === 85) {{}} | Use === for equality. | JavaScript |
<ul><li>world<li>world</ul> | <ul><li>world</li><li>world</li></ul> | Close li. | HTML |
{{"age":"test" "id":79}} | {{"age":"test", "id":79}} | Add comma. | JSON |
<div><p>result</div></p> | <div><p>result</p></div> | Nest properly. | HTML |
{{'age':'hello'}} | {{"age":"hello"}} | Use double quotes. | JSON |
Write-Host 'data' | Write-Host 'data' | Correct. | PowerShell |
let data: i32 = "info"; | let data: &str = "info"; | Type mismatch. | Rust |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
class Child Super: | class Child(Super): | Inheritance uses parentheses. | Python |
if (z = 78) | if (z == 78) | Use ==. | R |
let foo = 48; | let foo = 48; | Correct. | JavaScript |
31data = 10 | data31 = 10 | Variable cannot start with digit. | Python |
var x int | var x int | Correct. | Go |
assert foo > 90 | assert foo > 90 | Correct. | Python |
arr.forEach(function(y) {{ console.log(y); }}) | arr.forEach((y) => {{ console.log(y); }}) | Arrow functions are cleaner. | JavaScript |
WHERE id = '58' | WHERE id = 58 | Don't quote integer. | SQL |
int arr[89]; arr[89]=5; | int arr[89]; if(89<89){{}} else arr[89]=5; | Bounds check. | C++ |
#content {{ color: green; }} | #content {{ color: green; }} | Correct. | CSS |
raise 'data' | raise Exception('data') | Raise needs an exception class. | Python |
for (int i=0; i<66; i++) {{}} | for (int i=0; i<66; i++) {{}} | Correct. | Java |
echo 'message' | echo 'message'; | Add semicolon. | PHP |
data[64] | if data.indices.contains(64) {{ data[64] }} | Check index. | Swift |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
class = 'output' | class_name = 'output' | 'class' is a keyword. | Python |
while read line; do echo $line; done < data.txt | while read line; do echo $line; done < data.txt | Correct. | Shell |
if data = 44 then
print('output')
end | if data == 44 then
print('output')
end | Use ==. | Lua |
const result = 48; result = 49; | let result = 48; result = 49; | Cannot reassign const. | JavaScript |
with open('config.json') as fp:
data = fp.read() | with open('config.json') as fp:
data = fp.read() | Correct. | Python |
[59, 32, 70 | [59, 32, 70] | Close bracket. | Python |
if (result = 27) {} | if (result == 27) {} | Use ==. | Dart |
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
print 'data' | print('data') | print needs parentheses. | Python |
int values[93]; values[93]=5; | int values[93]; if(93<93){{}} else values[93]=5; | Bounds check. | C++ |
if (bar = 75) {{}} | if (bar === 75) {{}} | Use === for equality. | JavaScript |
var index int = 'info' | var index string = 'info' | Type mismatch. | Go |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
yield val | yield val | Correct yield. | Python |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
{{"title":"world" "age":25}} | {{"title":"world", "age":25}} | Add comma. | JSON |
y > 99 & x < 49 | y > 99 and x < 49 | Use 'and' not '&'. | Python |
var x int | var x int | Correct. | Go |
my @arr = (38,46,57); | my @arr = (38,46,57); | Correct. | Perl |
<div color=blue> | <div style='color:blue;'> | Use style attribute. | CSS |
echo output hello | echo 'output hello' | Quote to prevent splitting. | Shell |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
while count > 68
count -= 1 | while count > 68:
count -= 1 | Colon missing after while. | Python |
a = 56 | a=56 | No spaces. | Shell |
baz | baz() | Add parentheses. | Swift |
def test():
print('hello') | def test():
print('hello') | Indent function body. | Python |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
String name = 'test'; | String name = 'test'; | Correct. | Dart |
{{"value":"world",}} | {{"value":"world"}} | Remove trailing comma. | JSON |
for (data in values) | for (data of values) | for...in iterates keys. | JavaScript |
if result > 55
puts 'message' | if result > 55
puts 'message'
end | Add 'end'. | Ruby |
if ($val = 6) {{}} | if ($val -eq 6) {{}} | Use -eq. | PowerShell |
data[57] | if (length(data) >= 57) data[57] | Check length. | R |
local c = 80 | local c = 80 | Correct. | Lua |
class = 'value' | class_name = 'value' | 'class' is a keyword. | Python |
y = message | y = 'message' | Quote strings. | Python |
val c: Int = 'data' | val c: String = 'data' | Fix type. | Kotlin |
for a in range(5)
print(a) | for a in range(5):
print(a) | Colon after for. | Python |
if (result = 20) | if (result == 20) | Use ==. | C++ |
let mut count=76; let r1=&mut count; let r2=&mut count; | let mut count=76; {{ let r1=&mut count; }} let r2=&mut count; | Only one mutable borrow. | Rust |
raise 'hello' | raise Exception('hello') | Raise needs an exception class. | Python |
String val = 'value'; | String val = "value"; | Double quotes. | Java |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
if (a = 56) {{}} | if (a == 56) {{}} | Use ==. | Kotlin |
println('value') | println("value") | Double quotes. | Scala |
else
print('test') | else:
print('test') | Colon after else. | Python |
x := 10 | x := 10 | Correct. | Go |
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