const something = { bar: "Foobar!" };
const foo = 'bar';
something.foo; // The idea is to access something.bar, getting "Foobar!"

const foo = 'bar';
something[foo];

var foo = { pName1 : 1, pName2 : [1, {foo : bar }, 3] , ...}

var name = "pName"
var num  = 1;

foo[name + num]; // 1

// --

var a = 2;
var b = 1;
var c = "foo";

foo[name + a][b][c]; // bar

var suffix = " name";

var person = {
    ["first" + suffix]: "Nicholas",
    ["last" + suffix]: "Zakas"
};

console.log(person["first name"]);      // "Nicholas"
console.log(person["last name"]);       // "Zakas"

var obj = {method:function(p1,p2,p3){console.log("method:",arguments)}}

var str = "method('p1', 'p2', 'p3');"

var match = str.match(/^s*(S+)((.*));s*$/);

var func = match[1]
var parameters = match[2].split(',');
for(var i = 0; i < parameters.length; ++i) {
  // clean up param begninning
    parameters[i] = parameters[i].replace(/^s*['"]?/,'');
  // clean up param end
  parameters[i] = parameters[i].replace(/['"]?s*$/,'');
}

obj[func](parameters); // sends parameters as array
obj[func].apply(this, parameters); // sends parameters as individual values

function fetchFromObject(obj: Object, path: string): boolean | Object {
var dot_idx: number;
var lbkt_idx: number;
var rbkt_idx: number;
var prop: string;
var prop_idx: number;
var new_obj: Object;
var new_path: string;

// Return if no object.
if (typeof obj === 'undefined') {
    return false;
}

// Get index of first left bracket in path.
lbkt_idx = path.indexOf('[');
// If left bracket.
if (lbkt_idx > -1) {
    // Get right bracket index.
    rbkt_idx = path.indexOf(']');
}
// Get index of first dot in path.
dot_idx = path.indexOf('.');

/*
 * Most complicated situation is if there are both brackets
 * and dots in the path. This means we have a mixture of both
 * indexed and non-indexed properties:
 *
 *      x[].y --or-- x.y[]
 *
 * In this case, we must see if the indexed property is before
 * or after the non-indexed property.
 *
 * In either case, we must recurse.
 */
if ((lbkt_idx > -1) && (dot_idx > -1)) {
    // If bracket is before dot: x[].y
    if (lbkt_idx < dot_idx) {
        // Get property string.
        prop = path.substr(0, lbkt_idx);
        // Get index.
        prop_idx = Number(path.substring(lbkt_idx + 1, rbkt_idx));
        // Get path to right of dot.
        new_path = path.substr(dot_idx + 1);
        // Get new object.
        new_obj = obj[prop][prop_idx];
        // Recurse.
        return fetchFromObject(new_obj, new_path);
    }
    // Else dot before bracket: x.y[]
    else {
        // Get property string.
        prop = path.substr(0, dot_idx);
        // Get path to right of dot.
        new_path = path.substr(dot_idx + 1);
        // Get new object.
        new_obj = obj[prop];
        // Recurse.
        return fetchFromObject(new_obj, new_path);
    }
}
/*
 * Else recurse if dotted property; x.y
 */
else if (dot_idx > -1) {
    // Get property string.
    prop = path.substr(0, dot_idx);
    // Get path to right of dot.
    new_path = path.substr(dot_idx + 1);
    // Get new object.
    new_obj = obj[prop];
    // Recurse.
    return fetchFromObject(new_obj, new_path);
}
/*
 * Else done if single indexed property: x[]
 */
else if (lbkt_idx > -1) {
    // Get property string.
    prop = path.substr(0, lbkt_idx);
    // Get index.
    prop_idx = Number(path.substring(lbkt_idx + 1, rbkt_idx));
    // Return with object.
    return obj[prop][prop_idx];
}
/*
 * Else single non-indexed property.
 */
return obj[path];

// Accessing root property
var rootProp = 'rootPropert';
_.get(object, rootProp, defaultValue);

// Accessing nested property
var listOfNestedProperties = [var1, var2];
_.get(object, listOfNestedProperties);

var obj = {firstLevel: 1, nested: {test: 2}};
console.log(eval('obj.firstLevel')); // 1
console.log(eval('obj.nested.test')); // 2

// creating reference
var ref = eval('obj.nested');
console.log(ref === obj.nested); // true
ref.newProperty = 3;
console.log(eval('obj.nested.newProperty')); // 3

var newObj = {value: 1, nested: {value: 0}};
eval('newObj.value = 5');
eval('newObj.nested.value = 10');
console.log(newObj.value);
console.log(newObj.nested.value);