javascript — converting string to array of tuples

问题

I have a string that I want to convert into array

"[(6, 11), (12, 17), (18, 20)]"

.split() wouldn't work (or at least I don't know how to separate the words) and JSON.parse always craps out with Uncaught SyntaxError: Unexpected token

I'm converting like this: JSON.parse(THAT_GIVEN_LIST)

Am I doing something wrong? How do I make this string into a nice list of [(6, 11), (12, 17), (18, 20)]

回答1:

The parentheses that you are using are not syntactically correct for JSON. You pose that they mean to define a tuple. However, tuples are not JSON primitives. If you want to have nested structures like this, your best bet will be to use nested arrays:

const a = "[[6, 11], [12, 17], [18, 20]]";
const aa = JSON.parse(a);
console.log(aa);

aa.forEach(i => console.log(`first: ${i[0]}, second: ${i[1]}`));

回答2:

Having your input format as python list, you can do it in next way:

'use strict';

const tuple = "[(6, 11), (12, 17), (18, 20)]";

const tupleToArray = JSON.parse(tuple
  .replace(/\(/g, '[')
  .replace(/\)/g, ']')
);

console.log(tupleToArray);

回答3:

Using JSON.parse() to get the 2-D array. Replaced occurences of "(" with "[" and ")" with "]".

var arr = JSON.parse("[(6, 11), (12, 17), (18, 20)]".split("(").join("[").split(")").join("]"));

console.log(arr);

回答4:

You could do something like I did below. Basically I removed all the white-space from the original string then used regex and split the string into an array. Finally I used another regex and spread operator to map the formatted strings to a new array:

var s = "[(6, 11), (12, 17), (18, 20)]";

function makeTuple(str) {
  return str
    .replace(/\s/g, "")
    .split("),(")
    .map(el => [...el.replace(/[\[()\]]/g, '').split(',')]);
}

console.log(makeTuple(s));

来源：https://stackoverflow.com/questions/52046119/javascript-converting-string-to-array-of-tuples

标签

javascript

arrays

json

string

tuples