wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
if a = 55: | if a == 55: | Use == for comparison. | Python |
values[88] | if values.indices.contains(88) {{ values[88] }} | Check index. | Swift |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
let bar: i32 = "world"; | let bar: &str = "world"; | Type mismatch. | Rust |
'info' + 22 | 'info' + str(22) | Can't add int to string. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
SELECT id role FROM items; | SELECT id, role FROM items; | Add comma. | SQL |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
val item: Int = 'message' | val item: String = 'message' | Fix type. | Kotlin |
if c = 48 | if c == 48 | Use ==. | Ruby |
jwt.sign({{id:33}}, 'token'); | jwt.sign({{id:33}}, 'token', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
System.out.println('hello') | System.out.println('hello'); | Add semicolon. | Java |
arr.forEach(function(b) {{ console.log(b); }}) | arr.forEach((b) => {{ console.log(b); }}) | Arrow functions are cleaner. | JavaScript |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
let b = 70; | let b = 70; | Correct. | JavaScript |
print 'test' | print('test') | print needs parentheses. | Python |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
if ($result = 80) {{}} | if ($result -eq 80) {{}} | Use -eq. | PowerShell |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
let x: number = 'result'; | let x: string = 'result'; | Fix type. | TypeScript |
let v=vec![85,90,45]; let primary=&v[0]; v.push(33); | let mut v=vec![85,90,45]; let primary=v[0]; v.push(33); | Copy instead of reference. | Rust |
list(44) | if length(list) >= 44, list(44), end | Check length. | MATLAB |
let val = 'data' | let val = "data" | Double quotes. | Swift |
'data' + 23 | 'data' + 23.to_s | Convert int. | Ruby |
SELECT COUNT(*) FROM products | SELECT COUNT(*) FROM products; | Missing semicolon. | SQL |
echo 'hello' | echo 'hello'; | Add semicolon. | PHP |
baz | baz() | Add parentheses. | Kotlin |
let count = 42; let count = 23; | let count = 42; count = 23; | Duplicate declaration. | JavaScript |
[x*x for x in values if x > 66] | [x*x for x in values if x > 66] | Correct list comprehension. | Python |
if (count) console.log('yes') else console.log('no') | if (count) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
<note><desc>data</desc><name>78</name></note | <note><desc>data</desc><name>78</name></note> | Add closing >. | XML |
a > 8 & x < 17 | a > 8 and x < 17 | Use 'and' not '&'. | Python |
val b = 'test' | val b = "test" | Double quotes. | Kotlin |
if count > 10
puts 'value' | if count > 10
puts 'value'
end | Add 'end'. | Ruby |
<center>info</center> | <div style='text-align:center;'>info</div> | Use CSS. | HTML |
let data = 25; data += 1; | let mut data = 25; data += 1; | Need mut to modify. | Rust |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
function foo() {{ echo 'test'; }} | function foo() {{ echo 'test'; }} | Correct. | PHP |
[23, 2, 7 | [23, 2, 7] | Close bracket. | Ruby |
fn bar() -> i32 {{ 35 }} | fn bar() -> i32 {{ 35 }} | Correct. | Rust |
local val = 98 | local val = 98 | Correct. | Lua |
if temp = 31 | if temp == 31 | Use ==. | MATLAB |
def handle():
print('data') | def handle():
print('data') | Indent function body. | Python |
for (int i=0; i<94; i++) {{}} | for (int i=0; i<94; i++) {{}} | Correct. | Java |
$x = 5; if ($x -eq 5) { Write-Host 'yes' } | $x = 5; if ($x -eq 5) { Write-Host 'yes' } | Correct. | PowerShell |
for x in range(64)
print(x) | for x in range(64):
print(x) | Colon after for. | Python |
var temp int = 'world' | var temp string = 'world' | Type mismatch. | Go |
print('result') | print('result') | Correct. | R |
void bar();
int main(){{bar();}} | void bar(); // prototype
int main(){{bar();}} | Declare before use. | C++ |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
data.forEach(function(bar) {{ console.log(bar); }}) | data.forEach((bar) => {{ console.log(bar); }}) | Arrow functions are cleaner. | JavaScript |
assert bar > 31 | assert bar > 31 | Correct. | Python |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
if (temp = 74) {{}} | if (temp == 74) {{}} | Use ==. | Java |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
disp('data') | disp('data') | Correct. | MATLAB |
<table><tr><td>test<td>hello</tr></table> | <table><tr><td>test</td><td>hello</td></tr></table> | Close td. | HTML |
echo result test | echo 'result test' | Quote to prevent splitting. | Shell |
switch(num){{ case 66: break; }} | switch(num){{ case 66: break; default: break; }} | Add default case. | Java |
String result = 'world'; | String result = "world"; | Double quotes. | Java |
val y: Int = 'info' | val y: String = 'info' | Fix type. | Kotlin |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
val x = 14; x = 82 | var x = 14; x = 82 | Use var for reassignment. | Scala |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
if (y = 4) | if (y == 4) | Use ==. | R |
<entry name='test'/> | <entry name="test"/> | Double quotes. | XML |
{ "name": "info" } | { "name": "info" } | Correct. | JSON |
if result = 81: | if result == 81: | Use == for comparison. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
if (x = 74) {} | if (x == 74) {} | Use ==. | Dart |
print 'info' | print('info') | print needs parentheses. | Python |
if (x = 39) {{}} | if (x === 39) {{}} | Use === for equality. | JavaScript |
let foo: Int = 'output' | let foo: String = 'output' | Fix type. | Swift |
if (b = 70) | if (b == 70) | Use ==. | Scala |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
bar = 44 | bar=44 | No spaces. | Shell |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
DELETE FROM orders WHERE name=43 | DELETE FROM orders WHERE name=43; | Add semicolon. | SQL |
cin >> x; | int x;
cin >> x; | Declare variable. | C++ |
var x int | var x int | Correct. | Go |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
if foo > 19
print('output') | if foo > 19:
print('output') | Colon missing after if. | Python |
value: test
value: data, | value: test
value: data | Remove comma. | YAML |
if val = 63 | if val == 63 | Use ==. | Go |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
{{"status":"data" "age":57}} | {{"status":"data", "age":57}} | Add comma. | JSON |
<p>value <b>data</p></b> | <p>value <b>data</b></p> | Nest properly. | HTML |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
object Product {{ def main(args: Array[String]) = println("message") }} | object Product {{ def main(args: Array[String]): Unit = println("message") }} | Add return type Unit. | Scala |
var x = 9; | var x = 9; | Correct. | Dart |
console.log('hello' | console.log('hello') | Close parenthesis. | JavaScript |
function test() {{
return
{{key:'world'}}
}} | function test() {{
return {{key:'world'}};
}} | Return object on same line. | JavaScript |
WHERE email = '40' | WHERE email = 40 | Don't quote integer. | SQL |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
<hr></hr> | <hr> | Self-closing. | HTML |
for i=1,13 do print(i) end | for i=1,13 do print(i) end | Correct. | Lua |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
try {{ throw 'test'; }} catch(e) {{}} | try {{ throw new Error('test'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
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