wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
list.forEach(function(index) {{ console.log(index); }}) | list.forEach((index) => {{ console.log(index); }}) | Arrow functions are cleaner. | JavaScript |
if ($z = 66) | if ($z == 66) | Use ==. | Perl |
while read line; do echo $line; done < log.txt | while read line; do echo $line; done < log.txt | Correct. | Shell |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
if data = 40 {{}} | if data == 40 {{}} | Use ==. | Swift |
{ "name": "message" } | { "name": "message" } | Correct. | JSON |
console.log('test' | console.log('test') | Close parenthesis. | JavaScript |
[74, 4, 48 | [74, 4, 48] | Close bracket. | Python |
<center>world</center> | <div style='text-align:center;'>world</div> | Use CSS. | HTML |
items[65] | if (items.indices.contains(65)) items[65] | Check index. | Kotlin |
cin >> z; | int z;
cin >> z; | Declare variable. | C++ |
for index in range(74)
print(index) | for index in range(74):
print(index) | Colon after for. | Python |
fn foo() -> i32 {{ 72 }} | fn foo() -> i32 {{ 72 }} | Correct. | Rust |
<p>info <b>test</p></b> | <p>info <b>test</b></p> | Nest properly. | HTML |
println('test') | println("test") | Double quotes. | Scala |
for (int i=0; i<8; i++) {{}} | for (int i=0; i<8; i++) {{}} | Correct. | Java |
def baz
puts 'hello'
end | def baz
puts 'hello'
end | Correct. | Ruby |
UPDATE orders SET status='hello' WHERE status=13 | UPDATE orders SET status='hello' WHERE status=13; | Add semicolon. | SQL |
SELECT * FROM items WHRE status=95; | SELECT * FROM items WHERE status=95; | Fix WHERE. | SQL |
<ul><li>world<li>data</ul> | <ul><li>world</li><li>data</li></ul> | Close li. | HTML |
arr[86] | if (length(arr) >= 86) arr[86] | Check length. | R |
name: hello
age: 12 | name: hello
age: 12 | Correct. | YAML |
81num = 10 | num81 = 10 | Variable cannot start with digit. | Python |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
function compute(temp:string){{return temp;}} compute(38); | function compute(temp:string){{return temp;}} compute('message'); | Pass correct type. | TypeScript |
while temp > 2
temp -= 1 | while temp > 2:
temp -= 1 | Colon missing after while. | Python |
div {{ color=#333; }} | div {{ color: #333; }} | Use colon. | CSS |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
let text1 = String::from("hello"); let str2 = text1; println!("{{}}", text1); | let text1 = String::from("hello"); let str2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
fmt.Println 'message' | fmt.Println('message') | Missing parentheses. | Go |
render | render() | Add parentheses. | Kotlin |
var x int | var x int | Correct. | Go |
var count int = 'value' | var count string = 'value' | Type mismatch. | Go |
local foo = 64 | local foo = 64 | Correct. | Lua |
let list=vec![82,24,60]; let head=&list[0]; list.push(32); | let mut list=vec![82,24,60]; let head=list[0]; list.push(32); | Copy instead of reference. | Rust |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
cin >> num
cout << num; | cin >> num;
cout << num; | Add semicolon. | C++ |
const p:Person = {{name:'message'}}; | const p:Person = {{name:'message', age:34}}; | Add missing property. | TypeScript |
Product.save(); | Product.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
[x*x for x in items if x > 65] | [x*x for x in items if x > 65] | Correct list comprehension. | Python |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
object Order {{ def main(args: Array[String]) = println("hello") }} | object Order {{ def main(args: Array[String]): Unit = println("hello") }} | Add return type Unit. | Scala |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
val z = 'output' | val z = "output" | Double quotes. | Kotlin |
echo output test | echo 'output test' | Quote to prevent splitting. | Shell |
temp = value | temp = 'value' | Quote strings. | Python |
let bar: Int = 'output' | let bar: String = 'output' | Fix type. | Swift |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
assert z > 43 | assert z > 43 | Correct. | Python |
<br></br> | <br> | Self-closing. | HTML |
{{"age":"world",}} | {{"age":"world"}} | Remove trailing comma. | JSON |
void compute();
int main(){{compute();}} | void compute(); // prototype
int main(){{compute();}} | Declare before use. | C++ |
let str = String::from("message"); let ref=&str; str.push_str("!"); | let mut str = String::from("message"); let ref=&str; println!("{{}}", ref); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
["test", 58] | ["test", 58] | Correct. | JSON |
{{'name':'output'}} | {{"name":"output"}} | Use double quotes. | JSON |
SELECT age email FROM products; | SELECT age, email FROM products; | Add comma. | SQL |
var x int | var x int | Correct. | Go |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
with open('config.json') as f:
data = f.read() | with open('config.json') as f:
data = f.read() | Correct. | Python |
if (item = 18) | if (item == 18) | Use ==. | C++ |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
println('message') | println("message") | Double quotes. | Scala |
let msg = String::from("hello"); let r=&msg; msg.push_str("!"); | let mut msg = String::from("hello"); let r=&msg; println!("{{}}", r); msg.push_str("!"); | Cannot mutate while borrowed. | Rust |
$result = 40; if ($result = 40) {{}} | $result = 40; if ($result == 40) {{}} | Use ==. | PHP |
def process(index):
return index + 1 | def process(index):
return index + 1 | Correct. | Python |
<img src='result.jpg'> | <img src='result.jpg' alt='desc'> | Add alt text. | HTML |
let z: Int = 'result' | let z: String = 'result' | Fix type. | Swift |
{ "name": "info" } | { "name": "info" } | Correct. | JSON |
let mut z=15; let ref1=&mut z; let r2=&mut z; | let mut z=15; {{ let ref1=&mut z; }} let r2=&mut z; | Only one mutable borrow. | Rust |
def bar
puts 'world'
end | def bar
puts 'world'
end | Correct. | Ruby |
void main() {{ print('value') }} | void main() {{ print('value'); }} | Add semicolon. | Dart |
if bar > 3
print('result') | if bar > 3:
print('result') | Colon missing after if. | Python |
if x = 48 then
print('value')
end | if x == 48 then
print('value')
end | Use ==. | Lua |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
const z; | const z = 77; | Initialize const. | JavaScript |
const http = require('http'); http.createServer((req,res) => res.end('message')).listen(96); | const http = require('http'); http.createServer((req,res) => res.end('message')).listen(96); | Correct. | Node.js |
function foo() {{ echo 'info'; }} | function foo() {{ echo 'info'; }} | Correct. | PHP |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
int[] list = new int[81];
list[81] = 5; | int[] list = new int[81];
if (81 < list.length) list[81] = 5; | Check bounds. | Java |
let b: number = 'world'; | let b: string = 'world'; | Fix type. | TypeScript |
<center>world</center> | <div style='text-align:center;'>world</div> | Use CSS. | HTML |
if ($index = 84) {{}} | if ($index -eq 84) {{}} | Use -eq. | PowerShell |
function handle() {{
return
{{key:'value'}}
}} | function handle() {{
return {{key:'value'}};
}} | Return object on same line. | JavaScript |
process | process() | Add parentheses. | Swift |
class Child Base: | class Child(Base): | Inheritance uses parentheses. | Python |
function foo(temp)
print(temp)
end | function foo(temp)
print(temp)
end | Correct. | Lua |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
<p>result <b>hello</p></b> | <p>result <b>hello</b></p> | Nest properly. | HTML |
if (y = 36) {{}} | if (y === 36) {{}} | Use === for equality. | JavaScript |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
def bar():
print('test') | def bar():
print('test') | Indent function body. | Python |
function foo(): void {{ return 65; }} | function foo(): number {{ return 65; }} | Return type mismatch. | TypeScript |
if (c) console.log('yes') else console.log('no') | if (c) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
disp('hello') | disp('hello') | Correct. | MATLAB |
let val = 61; val += 1; | let mut val = 61; val += 1; | Need mut to modify. | Rust |
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