JS array string patch name to array(object)

问题

i have trouble with js array. I have patch name(string) look like ( "user.joey.friends.0.franc" ) and i need to "compress" to look like this:

console.log( parseArray( "user.joey.friends.0.franc" ) );
//Object {
            user: {
                joey: {
                    friends: {
                        0: {
                            franc: 1
                        }
                    }
                }
            }
        }

Any ideas, how to do that ?

回答1:

Here's a non recursive way to get you most of the way there.

function compress(str) {
    var split = str.split('.'), obj = {}, current = obj, i;

    for (i = 0; i < split.length; i++){
        current[split[i]] =  {} ;
        current = current[split[i]];
    }

    return obj;
}

回答2:

If you're saying you have an object with the structure you've quoted, and you're trying to look up the property defined by your string "user.joey.friends.0.franc", that's a fairly straightforward loop: Live Example

function findProperty(obj, path) {
    var steps = path.split(/\./);
    var step;
    var n;
    for (n = 0; n < steps.length; ++n) {
        step = steps[n];
        if (!(step in obj)) {
            return undefined;
        }
        obj = obj[step];
    }
    return obj;
}

var a =  {
  user: {
    joey: {
      friends: {
        0: {
          franc: 1
        }
      }
    }
  }
};

console.log(findProperty(a, "user.joey.friends.0.franc")); // "1"

回答3:

If you're trying to create an object from a string, this solution is what I currently use until I find something better (I believe it based on a namespacing method from Yahoo):

function createObject() {
  var a = arguments, i, j, d, _this;
  var out = {};
  for (i = 0; i < a.length; i = i + 1) {
    d = a[i].split('.');
    out2 = out;
    for (j = 0; j < d.length; j = j + 1) {
      out2[d[j]] = out2[d[j]] || {};
      out2 = out2[d[j]];
    }
  }
  return out;
}

createObject('user.joey.friends.0.franc');

DEMO

来源：https://stackoverflow.com/questions/25510551/js-array-string-patch-name-to-arrayobject