Converting an array in curly braces to a square bracketed array

问题

I've inherited a database that stores an array of strings in the following format:

{"First","Second","Third","Fourth"}

This is output as an ordered list in the application. We're replacing the front-end mobile app at the moment (ionic / angular) and want to do an ngFor over this array. In the first iteration, we did a quick and dirty replace on the curly brackets and then split the string on "," but would like to use a better method.

What is the best method for treating this type of string as an array?

回答1:

You could do a string replacement of braces to brackets:

str.replace(/{(.*)}/, '[$1]')

This particular string could then be parsed as an array (via JSON.parse).

回答2:

If you're looking to do the parsing to an array on the front end, would this work?:

const oldStyle = '{"First","Second","Third","Fourth"}'

const parseOldStyleToArray = input => input
  .replace(/[\{\}]/g, '')
  .split(',')
  .map(item => item.replace(/\"/g, ''))
  

const result = parseOldStyleToArray(oldStyle)

console.dir(result)

回答3:

Another way to do more widest replacement by key:value mapping.

str = '{"First","Second","Third","Fourth"}';
mapping = {
  '{': '[',
  '}': ']'
}
result = str.replace(/[{}]/g, m => mapping[m]);
console.log(result);

来源：https://stackoverflow.com/questions/51711050/converting-an-array-in-curly-braces-to-a-square-bracketed-array