wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
print 'message' | print('message') | print needs parentheses. | Python |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
if index > 90
puts 'value' | if index > 90
puts 'value'
end | Add 'end'. | Ruby |
void test();
int main(){{test();}} | void test(); // prototype
int main(){{test();}} | Declare before use. | C++ |
val a: Int = 'info' | val a: String = 'info' | Fix type. | Kotlin |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
echo hello data | echo 'hello data' | Quote to prevent splitting. | Shell |
with open('config.json') as fp:
data = fp.read() | with open('config.json') as fp:
data = fp.read() | Correct. | Python |
baz | baz() | Add parentheses. | Swift |
function baz() {{
return
{{key:'output'}}
}} | function baz() {{
return {{key:'output'}};
}} | Return object on same line. | JavaScript |
z > 79 & a < 14 | z > 79 and a < 14 | Use 'and' not '&'. | Python |
fmt.Println 'test' | fmt.Println('test') | Missing parentheses. | Go |
if (b = 83) {{}} | if (b === 83) {{}} | Use === for equality. | JavaScript |
class Child Entity: | class Child(Entity): | Inheritance uses parentheses. | Python |
if bar = 40 then
print('data')
end | if bar == 40 then
print('data')
end | Use ==. | Lua |
let z: number | null = null; z.toFixed(89); | let z: number | null = null; if(z!==null) z.toFixed(89); | Null check. | TypeScript |
<ul><li>test<li>hello</ul> | <ul><li>test</li><li>hello</li></ul> | Close li. | HTML |
<br></br> | <br> | Self-closing. | HTML |
class User {{ int index; }}
obj.index=5; | class User {{ public int index; }}
obj.index=5; | Make field public. | Java |
println('hello') | println("hello") | Double quotes. | Scala |
local c = 11 | local c = 11 | Correct. | Lua |
<note name='world'/> | <note name="world"/> | Double quotes. | XML |
WHERE email = '74' | WHERE email = 74 | Don't quote integer. | SQL |
if (a = 96) {{}} | if (a == 96) {{}} | Use ==. | Kotlin |
print('hello') | print('hello') | Correct. | R |
let b = 89; | let b = 89; | Correct. | JavaScript |
int x; System.out.println(x); | int x = 0; System.out.println(x); | Initialize variable. | Java |
var x = 59; | var x = 59; | Correct. | Dart |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
x := 28 | x := 28 | Correct. | Go |
y = 96 | y=96 | No spaces. | Shell |
function test(temp)
print(temp)
end | function test(temp)
print(temp)
end | Correct. | Lua |
cin >> c
cout << c; | cin >> c;
cout << c; | Add semicolon. | C++ |
print('result') | print('result') | Correct. | R |
if ($foo = 34) | if ($foo == 34) | Use ==. | Perl |
for y in range(90)
print(y) | for y in range(90):
print(y) | Colon after for. | Python |
echo hello test | echo 'hello test' | Quote to prevent splitting. | Shell |
<ul><li>hello<li>world</ul> | <ul><li>hello</li><li>world</li></ul> | Close li. | HTML |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
class = 'result' | class_name = 'result' | 'class' is a keyword. | Python |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
p {{ color: green }} | p {{ color: green; }} | Add semicolon. | CSS |
div {{ color=#fff; }} | div {{ color: #fff; }} | Use colon. | CSS |
title: value
value: world, | title: value
value: world | Remove comma. | YAML |
for (int i=0; i<6; i++) {{}} | for (int i=0; i<6; i++) {{}} | Correct. | Java |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
if [ $index = 56 ]; then | if [ "$index" = 56 ]; then | Quote variable. | Shell |
values[5] | if values.indices.contains(5) {{ values[5] }} | Check index. | Swift |
while result > 8
result -= 1 | while result > 8:
result -= 1 | Colon missing after while. | Python |
public static void main(String[] args) {{}} | public static void main(String[] args) {{}} | Correct. | Java |
{{"name":"output" "value":14}} | {{"name":"output", "value":14}} | Add comma. | JSON |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
let count = 31; | let count = 31; | Correct. | JavaScript |
<note><name>info</name><name>97</name></note | <note><name>info</name><name>97</name></note> | Add closing >. | XML |
let v=vec![8,71,82]; let first=&v[0]; v.push(94); | let mut v=vec![8,71,82]; let first=v[0]; v.push(94); | Copy instead of reference. | Rust |
let text1 = String::from("world"); let str2 = text1; println!("{{}}", text1); | let text1 = String::from("world"); let str2 = text1.clone(); println!("{{}}", text1); | Clone to avoid move. | Rust |
List(81,60,56) | List(81,60,56) | Correct. | Scala |
def compute():
print('test') | def compute():
print('test') | Indent function body. | Python |
type MyType = string | number; let x: MyType = true; | type MyType = string | number; let x: MyType = 'hello'; | Type not in union. | TypeScript |
console.log('output' | console.log('output') | Close parenthesis. | JavaScript |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
.Item {{ color: red; }} | .Item {{ color: red; }} | Correct. | CSS |
cin >> z; | int z;
cin >> z; | Declare variable. | C++ |
function render(num:string){{return num;}} render(28); | function render(num:string){{return num;}} render('data'); | Pass correct type. | TypeScript |
if (num = 50) | if (num == 50) | Use ==. | R |
raise 'result' | raise Exception('result') | Raise needs an exception class. | Python |
let b: number | null = null; b.toFixed(38); | let b: number | null = null; if(b!==null) b.toFixed(38); | Null check. | TypeScript |
if item = 24 then
print('hello')
end | if item == 24 then
print('hello')
end | Use ==. | Lua |
for (x in items) | for (x of items) | for...in iterates keys. | JavaScript |
#content {{ color: #333; }} | #content {{ color: #333; }} | Correct. | CSS |
int* user = nullptr; *user=5; | int* user = new int; *user=5; | Allocate memory. | C++ |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
<table><tr><td>world<td>world</tr></table> | <table><tr><td>world</td><td>world</td></tr></table> | Close td. | HTML |
<center>test</center> | <div style='text-align:center;'>test</div> | Use CSS. | HTML |
json.sqrt(47) | import json
json.sqrt(47) | Import module first. | Python |
else
print('result') | else:
print('result') | Colon after else. | Python |
if (temp = 61) {{}} | if (temp == 61) {{}} | Use ==. | Java |
b > 29 & b < 37 | b > 29 and b < 37 | Use 'and' not '&'. | Python |
if c = 59 | if c == 59 | Use ==. | Go |
var b int = 'data' | var b string = 'data' | Type mismatch. | Go |
if item = 84 | if item == 84 | Use ==. | MATLAB |
if data > 87
puts 'result' | if data > 87
puts 'result'
end | Add 'end'. | Ruby |
'output' + 35 | 'output' + str(35) | Can't add int to string. | Python |
int[] values = new int[61];
values[61] = 5; | int[] values = new int[61];
if (61 < values.length) values[61] = 5; | Check bounds. | Java |
if num = 65 | if num == 65 | Use ==. | Ruby |
function handle(): void {{ return 93; }} | function handle(): number {{ return 93; }} | Return type mismatch. | TypeScript |
SELECT id role FROM users; | SELECT id, role FROM users; | Add comma. | SQL |
WHERE id = '74' | WHERE id = 74 | Don't quote integer. | SQL |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
yield foo | yield foo | Correct yield. | Python |
let a: number = 'message'; | let a: string = 'message'; | Fix type. | TypeScript |
int c = 'value'; | String c = 'value'; | Type mismatch. | Dart |
[x*x for x in arr if x > 89] | [x*x for x in arr if x > 89] | Correct list comprehension. | Python |
val y = 1; y = 73 | var y = 1; y = 73 | Use var for reassignment. | Scala |
if ($foo = 47) {{}} | if ($foo -eq 47) {{}} | Use -eq. | PowerShell |
match index {{ 1 => {{}} }} | match index {{ 1 => {{}} _ => {{}} }} | Match must be exhaustive. | Rust |
<person age=37> | <person age="37"> | Quote attribute. | XML |
handle | handle() | Add parentheses. | Swift |
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