How transform string dot notation to nested object?

Question

I want convert a dot notation string like 'a.b.c.d' to an Object. If the Object doesnt exist I want create a empty one.

var str = 'a.b.c.d'
var obj = {}

// so ...

function dotToObj(obj, str) {
    // something 
    obj[?] = obj[?] || {}            
     }

// If object doesnt exist so create a empty object.

var rsp = dotToObj(obj, str);


console.log(rsp)

// Excpect:
Object {a: Object}
    a: Object
        b: Object
            c: Object
                d: Object
                __proto__: Object
            __proto__: Object
        __proto__: Object
    __proto__: Object

Nina Scholz · Accepted Answer · 2016-01-20 12:10:08Z

7

You can split the string and use the parts for the reference with Array.prototype.reduce(), where obj is used as the start object and while iterating, the new reference is returned.

var str = 'a.b.c.d',
    obj = {};

str.split('.').reduce(function (r, a) {
    r[a] = r[a] || {};
    return r[a];
}, obj);

document.write('<pre>' + JSON.stringify(obj, 0, 4) + '</pre>');

edited Jan 20, 2016 at 12:10

answered Jan 20, 2016 at 12:03

Nina Scholz

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2 Comments

huykon225 Over a year ago

how can I set value for deepest value, example d = 123?

Nina Scholz Over a year ago

@huykon225, you could take s/t like this: stackoverflow.com/questions/55635011/…

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