package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)^Q: ((?:.*|\n)*?)\n*A: (.+(?:\n(?:^.{1,3}$|^.{4}(?<!<!--).*))*)
`)
var str = `Q: diff between null and undefined?
A: Null indicates an intentional empty value.
- Undefined indicates the total absence of a value. This happen when only the variable was declared without any initializer. A missing key in an object is also undefined.
\`\`\`javascript
export function ticketStatus(tickets, ticketId) {
if (tickets[ticketId] === undefined) {
return 'unknown ticket id';
} else if (tickets[ticketId] === null) {
return 'not sold';
} else {
return \`sold to ${tickets[ticketId]}\`;
}
}
\`\`\`
<!--ID: 1673953179724-->
---
Q: rewrite to use [[JS Object.assign]]
\`\`\`javascript
visitor.ticketId = null;
return visitor;
\`\`\`
A: Just pass only the props we want to overwrite to assign
\`\`\`javascript
return Object.assign(visitor, {ticketId: null});
\`\`\`
<!--ID: 1673953179746-->
---
Q: diff between isNaN() global vs Number.isNaN()?
A: global isNaN() does type conversion.
- Since I am trying to test whether the string contains a valid number, this is the right choice.
- If the input is already a number, then Number.isNaN() might be better. as
---
`
for i, match := range re.FindAllString(str, -1) {
fmt.Println(match, "found at index", i)
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Golang, please visit: https://golang.org/pkg/regexp/