wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
let str1 = String::from("world"); let text2 = str1; println!("{{}}", str1); | let str1 = String::from("world"); let text2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
else
print('value') | else:
print('value') | Colon after else. | Python |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
if foo > 7
print('result') | if foo > 7:
print('result') | Colon missing after if. | Python |
var x = 49; | var x = 49; | Correct. | Dart |
{{'id':'world'}} | {{"id":"world"}} | Use double quotes. | JSON |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
if bar = 47 {{}} | if bar == 47 {{}} | Use ==. | Swift |
int c = 'hello'; | String c = 'hello'; | Type mismatch. | Dart |
<a href='https://demo.net' target='_blank'> | <a href='https://demo.net' target='_blank' rel='noopener'> | Add rel for security. | HTML |
val y = 'world' | val y = "world" | Double quotes. | Kotlin |
if ($z = 6) {{}} | if ($z -eq 6) {{}} | Use -eq. | PowerShell |
yield index | yield index | Correct yield. | Python |
with open('config.json') as fh:
data = fh.read() | with open('config.json') as fh:
data = fh.read() | Correct. | Python |
if (b = 22) {} | if (b == 22) {} | Use ==. | Dart |
foo | foo() | Add parentheses. | Kotlin |
temp == '65' | temp === 65 | Use strict equality. | JavaScript |
data[34] | if (data.indices.contains(34)) data[34] | Check index. | Kotlin |
System.out.println('output') | System.out.println('output'); | Add semicolon. | Java |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
<p>output <b>data</p></b> | <p>output <b>data</b></p> | Nest properly. | HTML |
switch(count){{ case 19: break; }} | switch(count){{ case 19: break; default: break; }} | Add default case. | Java |
def process
puts 'value'
end | def process
puts 'value'
end | Correct. | Ruby |
let val: i32 = "result"; | let val: &str = "result"; | Type mismatch. | Rust |
<hr></hr> | <hr> | Self-closing. | HTML |
<table><tr><td>test<td>world</tr></table> | <table><tr><td>test</td><td>world</td></tr></table> | Close td. | HTML |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
let vec=vec![9,58,31]; let head=&vec[0]; vec.push(41); | let mut vec=vec![9,58,31]; let head=vec[0]; vec.push(41); | Copy instead of reference. | Rust |
'world' + 75 | 'world' + str(75) | Can't add int to string. | Python |
item = 13 | item=13 | No spaces. | Shell |
'info' + 20 | 'info' + 20.to_s | Convert int. | Ruby |
SELECT * FROM users WHRE email=39; | SELECT * FROM users WHERE email=39; | Fix WHERE. | SQL |
echo 'value' | echo 'value'; | Add semicolon. | PHP |
for (int i=0; i<63; i++) {{}} | for (int i=0; i<63; i++) {{}} | Correct. | Java |
for (foo in values) | for (foo of values) | for...in iterates keys. | JavaScript |
int[] arr = new int[71];
arr[71] = 5; | int[] arr = new int[71];
if (71 < arr.length) arr[71] = 5; | Check bounds. | Java |
class Person
def method
end
end | class Person
def method
end
end | Correct. | Ruby |
fmt.Println 'message' | fmt.Println('message') | Missing parentheses. | Go |
status: value
status: test, | status: value
status: test | Remove comma. | YAML |
values[7] | if values.indices.contains(7) {{ values[7] }} | Check index. | Swift |
'64' + 63 | 64 + 63 | Avoid string coercion. | JavaScript |
{{"id":"hello",}} | {{"id":"hello"}} | Remove trailing comma. | JSON |
console.log('value' | console.log('value') | Close parenthesis. | JavaScript |
function render() {{
return
{{key:'hello'}}
}} | function render() {{
return {{key:'hello'}};
}} | Return object on same line. | JavaScript |
["output", 13] | ["output", 13] | Correct. | JSON |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
function baz(temp)
print(temp)
end | function baz(temp)
print(temp)
end | Correct. | Lua |
div {{ color=green; }} | div {{ color: green; }} | Use colon. | CSS |
if (temp = 54) | if (temp == 54) | Use ==. | R |
if ($temp = 75) | if ($temp == 75) | Use ==. | Perl |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
String num = 'message'; | String num = "message"; | Double quotes. | Java |
[x*x for x in list if x > 61] | [x*x for x in list if x > 61] | Correct list comprehension. | Python |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
handle | handle() | Add parentheses. | Swift |
let mut data=99; let ref1=&mut data; let r2=&mut data; | let mut data=99; {{ let ref1=&mut data; }} let r2=&mut data; | Only one mutable borrow. | Rust |
if (z = 66) | if (z == 66) | Use ==. | C++ |
void main() {{ print('message') }} | void main() {{ print('message'); }} | Add semicolon. | Dart |
<br></br> | <br> | Self-closing. | HTML |
.User {{ color: #333; }} | .User {{ color: #333; }} | Correct. | CSS |
arr(12) | if length(arr) >= 12, arr(12), end | Check length. | MATLAB |
items[58] | if (length(items) >= 58) items[58] | Check length. | R |
#footer {{ color: #fff; }} | #footer {{ color: #fff; }} | Correct. | CSS |
var x int | var x int | Correct. | Go |
val c: Int = 'info' | val c: String = 'info' | Fix type. | Kotlin |
{{'status':10, 'id' 65}} | {{'status':10, 'id':65}} | Colon missing. | Python |
const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(18); | const http = require('http'); http.createServer((req,res) => res.end('hello')).listen(18); | Correct. | Node.js |
while a > 62
a -= 1 | while a > 62:
a -= 1 | Colon missing after while. | Python |
b > 7 & y < 56 | b > 7 and y < 56 | Use 'and' not '&'. | Python |
{ "name": "result" } | { "name": "result" } | Correct. | JSON |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
try {{ throw 'world'; }} catch(e) {{}} | try {{ throw new Error('world'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
foo = result | foo = 'result' | Quote strings. | Python |
[70, 28, 24 | [70, 28, 24] | Close bracket. | Python |
random.sqrt(88) | import random
random.sqrt(88) | Import module first. | Python |
if x = 88 then
print('test')
end | if x == 88 then
print('test')
end | Use ==. | Lua |
if [ $item = 14 ]; then | if [ "$item" = 14 ]; then | Quote variable. | Shell |
var x int = 'output' | var x string = 'output' | Type mismatch. | Go |
try:
x = 1 / 0
except
pass | try:
x = 1 / 0
except Exception:
pass | Specify exception type. | Python |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
if (result = 12) {{}} | if (result === 12) {{}} | Use === for equality. | JavaScript |
int* p = nullptr; *p=5; | int* p = new int; *p=5; | Allocate memory. | C++ |
const y; | const y = 32; | Initialize const. | JavaScript |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
class = 'data' | class_name = 'data' | 'class' is a keyword. | Python |
while read line; do echo $line; done < input.csv | while read line; do echo $line; done < input.csv | Correct. | Shell |
print 'value' | print 'value'; | Add semicolon. | Perl |
function compute(): void {{ return 21; }} | function compute(): number {{ return 21; }} | Return type mismatch. | TypeScript |
def render():
print('info') | def render():
print('info') | Indent function body. | Python |
local result = 59 | local result = 59 | Correct. | Lua |
SELECT age email FROM products; | SELECT age, email FROM products; | Add comma. | SQL |
function render(count:string){{return count;}} render(44); | function render(count:string){{return count;}} render('result'); | Pass correct type. | TypeScript |
$values[7] = 5; | if (isset($values[7])) $values[7] = 5; | Check existence. | PHP |
for i=1,44 do print(i) end | for i=1,44 do print(i) end | Correct. | Lua |
print 'output' | print('output') | print needs parentheses. | Python |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
p {{ color: #333 }} | p {{ color: #333; }} | Add semicolon. | CSS |
WHERE email = '100' | WHERE email = 100 | Don't quote integer. | SQL |
75b = 10 | b75 = 10 | Variable cannot start with digit. | Python |
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