Nested property getter and setter methods #Javascript #Utility

nested-property.jks

Object.prototype.setNested = function(s, v) {
    s = s.replace(/\[(\w+)\]/g, '.$1'); // convert indexes to properties
    s = s.replace(/^\./, '');           // strip a leading dot
    var a = s.split('.');
    o = this;
    while (a.length) {
        var n = a.shift();
        if(a.length == 0){
            o[n]=v;
            return;
        }else if (n in o) {
            o = o[n];
        } else {
            return;
        }
    }
}
Object.prototype.getNested = function(s){
    var o = this;
    s = s.replace(/\[(\w+)\]/g, '.$1'); // convert indexes to properties
    s = s.replace(/^\./, '');           // strip a leading dot
    var a = s.split('.');
    while (a.length) {
        var n = a.shift();
        if (n in o) {
            o = o[n];
        } else {
            return;
        }
    }
    return o;
} 
// Example
var someObject = {
    'part1' : {
        'name': 'Part 1',
        'size': '20',
        'qty' : '50'
    },
    'part2' : {
        'name': 'Part 2',
        'size': '15',
        'qty' : '60'
    },
    'part3' : [
        {
            'name': 'Part 3A',
            'size': '10',
            'qty' : '20'
        }, {
            'name': 'Part 3B',
            'size': '5',
            'qty' : '20'
        }, {
            'name': 'Part 3C',
            'size': '7.5',
            'qty' : '20'
        }
    ]
};

console.log(someObject.getNested( 'part1.name'));
console.log(someObject.getNested( 'part2.qty'));
console.log(someObject.getNested( 'part3[0].name'));
someObject.setNested( 'part3[0].name', "Changed");
console.log(someObject.getNested( 'part3[0].name'));