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A way to convert an object with keys of . seperated strings into a JSON object

I'm trying to figure out a way to turn and object like this :
{ "test.subtest.pass" : "test passed", "test.subtest.fail" : "test failed" }
into JSON like this:
{ "test": { "subtest": { "pass": "test passed", "fail": "test failed" }}}
sometimes there may be duplicate keys, as above perhaps there would be another entry like "test.subtest.pass.mark"
I have tried using the following method and it works but it's incredibly ugly:
convertToJSONFormat() {
const objectToTranslate = require('<linkToFile>');
const resultMap = this.objectMap(objectToTranslate, (item: string) => item.split('.'));
let newMap:any = {};
for (const [key,value] of Object.entries(resultMap)) {
let previousValue = null;
// #ts-ignore
for (const item of value) {
// #ts-ignore
if (value.length === 1) {
if(!newMap.hasOwnProperty(item)) {
newMap[item] = key
} // #ts-ignore
} else if (item === value[value.length - 1]) {
if(typeof previousValue[item] === 'string' ) {
const newKey = previousValue[item].toLowerCase().replace(/\s/g, '');;
const newValue = previousValue[item];
previousValue[item] = {};
previousValue[item][newKey] = newValue;
previousValue[item][item] = key;
} else {
previousValue[item] = key;
}
} else if (previousValue === null) {
if (!newMap.hasOwnProperty(item)) {
newMap[item] = {};
}
previousValue = newMap[item];
} else {
if (!previousValue.hasOwnProperty(item)) {
previousValue[item] = {}
previousValue = previousValue[item];
} else if (typeof previousValue[item] === 'string') {
const newValue = previousValue[item];
previousValue[item] = {};
previousValue[item][item] = newValue;
} else {
previousValue = previousValue[item];
}
}
}
}
return newMap;
}

We can utilize recursion to make the code a little less verbose:
function convertToJSONFormat(objectToTranslate) {
// create root object for the conversion result
const result = {};
// iterate each key-value pair on the object to be converted
Object
.entries(objectToTranslate)
.forEach(([path, value]) => {
// utilize a recursive function to write the value into the result object
addArrayPathToObject(result, path.split("."), value);
});
return result;
}
function addArrayPathToObject(root, parts, value) {
const p = parts.shift();
// base-case: We attach the value if we reach the last path fragment
if (parts.length == 0) {
root[p] = value
return;
}
// general case: check if root[p] exists, otherwise create it and set as new root.
if(!root[p]) root[p] = {};
addArrayPathToObject(root[p], parts, value)
}
This function utilizes the fact that objects are pass-by-reference to recursively traverse through the object starting at its root until setting the desired value.
You can add error-handling and other such concerns as necessary for your use.

#Meggan Naude, toJson function copies json object to reference obj for provided keys and value.
const p = { "test.subtest.pass" : "test passed", "test.subtest.fail" : "test failed" };
const result = {} ;
const toJson = (obj, keys, value) => {
if (keys?.length === 1) {
obj[keys[0]] = value;
return obj
} else {
const k = keys.splice(0, 1)
if (k in obj) {
toJson(obj[k], keys, value)
} else {
obj[k] = {};
toJson(obj[k], keys, value)
}
return obj
}
}
Object.keys(p).forEach(key => toJson(result, key.split('.'), p[key]))
console.log(result);

How can I create empty JSON keys (nested or not) using a string?

I currently have this code built in JS, but it's really, really ugly.
Is there any better way to approach it?
The way it works basically is pushing a string like app.chat.test to be the key, and value like teststr.
I test the lengths to see if the "parent" key is there, otherwise we build it.
function constructJson(jsonKey, jsonValue){
//REWRITE!!!!!!!!
let jsonObj = langFile;
let jsonKeyArr = jsonKey.split('.')
if (jsonKeyArr.length === 1) {
if (valToAdd === undefined) {
if (jsonObj[jsonKey] === undefined) {
jsonObj[jsonKey] = {}
}
} else {
if (jsonObj[jsonKey] === undefined) {
jsonObj[jsonKey] = valToAdd
}
}
} else if (jsonKeyArr.length === 2) {
if (jsonObj[jsonKeyArr[0]] === undefined) {
jsonObj[jsonKeyArr[0]] = {}
}
if (jsonObj[jsonKeyArr[0]][jsonKeyArr[1]] === undefined) {
jsonObj[jsonKeyArr[0]][jsonKeyArr[1]] = jsonValue
}
} else if (jsonKeyArr.length === 3) {
if (jsonObj[jsonKeyArr[0]] === undefined) {
jsonObj[jsonKeyArr[0]] = {}
}
if (jsonObj[jsonKeyArr[0]][jsonKeyArr[1]] === undefined) {
jsonObj[jsonKeyArr[0]][jsonKeyArr[1]] = {}
}
if (jsonObj[jsonKeyArr[0]][jsonKeyArr[1]][jsonKeyArr[2]] === undefined) {
jsonObj[jsonKeyArr[0]][jsonKeyArr[1]][jsonKeyArr[2]] = jsonValue
}
} else if (jsonKeyArr.length === 4) {
if (jsonObj[jsonKeyArr[0]] === undefined) {
jsonObj[jsonKeyArr[0]] = {}
}
if (jsonObj[jsonKeyArr[0]][jsonKeyArr[1]] === undefined) {
jsonObj[jsonKeyArr[0]][jsonKeyArr[1]] = {}
}
if (jsonObj[jsonKeyArr[0]][jsonKeyArr[1]][jsonKeyArr[2]] === undefined) {
jsonObj[jsonKeyArr[0]][jsonKeyArr[1]][jsonKeyArr[2]] = {}
}
if (jsonObj[jsonKeyArr[0]][jsonKeyArr[1]][jsonKeyArr[2]][jsonKeyArr[3]] === undefined) {
jsonObj[jsonKeyArr[0]][jsonKeyArr[1]][jsonKeyArr[2]][jsonKeyArr[3]] = jsonValue
}
} else if (jsonKeyArr.length === 5) {
if (jsonObj[jsonKeyArr[0]] === undefined) {
jsonObj[jsonKeyArr[0]] = {}
}
if (jsonObj[jsonKeyArr[0]][jsonKeyArr[1]] === undefined) {
jsonObj[jsonKeyArr[0]][jsonKeyArr[1]] = {}
}
if (jsonObj[jsonKeyArr[0]][jsonKeyArr[1]][jsonKeyArr[2]] === undefined) {
jsonObj[jsonKeyArr[0]][jsonKeyArr[1]][jsonKeyArr[2]] = {}
}
if (jsonObj[jsonKeyArr[0]][jsonKeyArr[1]][jsonKeyArr[2]][jsonKeyArr[3]] === undefined) {
jsonObj[jsonKeyArr[0]][jsonKeyArr[1]][jsonKeyArr[2]][jsonKeyArr[3]] = {}
}
if (jsonObj[jsonKeyArr[0]][jsonKeyArr[1]][jsonKeyArr[2]][jsonKeyArr[3]][jsonKeyArr[4]] === undefined) {
jsonObj[jsonKeyArr[0]][jsonKeyArr[1]][jsonKeyArr[2]][jsonKeyArr[3]][jsonKeyArr[4]] = jsonValue
}
} else if (jsonKeyArr.length > 5) {
return console.log("Length over 5 not supported yet!")
}
return jsonObj;
}
Regards.

OF course it's possible, a simple loop will perfeclty do the job.
function constructJson(jsonKey, jsonValue){
//REWRITE!!!!!!!!
langFile = {a:{}, foo:{}};// remove this for your own code
var jsonObj = langFile;
var jsonKeyArr = jsonKey.split('.');
var currentValue = jsonObj;
for(var i = 0; i < jsonKeyArr.length;i++){
if(currentValue[jsonKeyArr[i]]===undefined){
currentValue[jsonKeyArr[i]] = {};
}
if(i < jsonKeyArr.length-1){
currentValue = currentValue[jsonKeyArr[i]];
}else{
currentValue[jsonKeyArr[i]] = jsonValue;
}
}
return jsonObj;
}
alert(JSON.stringify(constructJson("a.b.cd.ef", "toto")));
I just assigning to a temporary variable each sublevel. When i'm on the last i'm assigning the value.

Yes you can, using the javascript reduce function on the array created from the splitted string.
function namespaceCreateExceptLast(representationOfElementToCreate, baseNamespace) {
var tokens;
if (typeof representationOfElementToCreate !== 'string')
throw new Error('Expecting string as first parameter');
if (baseNamespace === undefined)
baseNamespace = window;
tokens = representationOfElementToCreate.split('.');
// Remove the last element (which will contain the value)
tokens.pop();
// Use reduce to create part by part your new object
return tokens.reduce(function (prev, property) {
if (typeof prev !== 'object') {
throw Error('One property is already defined but not an object, namespace creation has failed', property);
return undefined;
} else {
if (!prev[property])
prev[property] = {};
return prev[property];
}
}, baseNamespace);
};
Then you can have:
function constructJson(jsonKey, jsonValue){
let jsonObj = langFile;
var lastItem = namespaceCreateExceptLast(jsonKey, jsonObj);
var lastKey = jsonKey.substring(jsonKey.lastIndexOf('.') + 1);
lastItem[lastKey] = jsonValue;
}
I have added some comments and exceptions to help you understand how it's done, but it's mainly based on the reduce function which you can easily get help for (https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Objets_globaux/Array/reduce).

Code works with arrays, but not multidimensional arrays.

Working on a Holdem hand evaluator, and part of the yak shaving is writing a "how many combos of 5 do you get from 7 cards" function (pickNofSet()). I've done that, but the way I've done that returns a bunch of duplicates.
So I have to write a removeDuplicates(). Here's the problem... it works with a simple array, but it doesn't work with the "arrays of arrays" that my "pickNofSet" function generates.
-- here's the removeDuplicates code --
var removeDuplicates = function(input){ // takes array
var output = [];
for (i=0; i < input.length; i++){
var unique = true; // all elements are innocent until proven guilty
for(j=i+1; j < input.length; j++){
if(input[j] === input[i]){
unique = false; // guilty!
};// endif
};// end jfor
if(unique){ // if not found guilty,
output.push(input[i]); // you may go free, little element
};// end if
};// end ifor
console.log(output);
return output; };//end function
Here's what I get from the Console:
> removeDuplicates(['a','b','c'],['a','b','c'],['d','e','f'],['g','h','i']);
< undefined
> removeDuplicates([1, 2, 2, 3, 3, 5, 5, 6, 6, 6]);
< [1, 2, 3, 5, 6]

Operator === can't compare array
As you use === to check equality between two elements, this only works with primitive data types, but not array. e.g.
1===1 // true
[1]===[1] // Sorry, you can't
If you want your algorithm to work with both primitive elements and array elements, you may need to upgrade your equality check from === to a customized function.
From this:
if(input[j] === input[i]){
unique = false; // guilty!
};// endif
To this:
if (equals(input[j],input[i]){
unique = false; // guilty!
};// endif
And implement equals function to be capable of comparing both primitive data types and arrays:
function equals(a,b){
if (typeof(a)!=typeof(b))
return false;
else if (typeof(a)=='object'){
if (Object.keys(a).length != Object.keys(b).length)
return false;
else{
for (var keyA of Object.keys(a)){
if (!(keyA in b))
return false;
else if (a[keyA]!==b[keyA])
return false;
else
return true;
}
}
}
else
return a===b;
}
Hint: This solution should, hopefully, also work with JSON element.

Here is an example of a general purpose unique filter that should fill your need. Requires an ES5 compliant environment.
(function () {
'use strict';
function $strictEqual(a, b) {
return a === b;
}
function $isUndefined(inputArg) {
return $strictEqual(typeof inputArg, 'undefined');
}
function $isPrimitive(inputArg) {
var type = typeof inputArg;
return type === 'undefined' || inputArg === null || type === 'boolean' || type === 'string' || type === 'number' || type === 'symbol';
}
function $isFunction(inputArg) {
return typeof inputArg === 'function';
}
function $isDate(inputArg) {
return Object.prototype.toString.call(inputArg) === '[object Date]';
}
function $isRegExp(inputArg) {
return Object.prototype.toString.call(inputArg) === '[object RegExp]';
}
function $isString(inputArg) {
return Object.prototype.toString.call(inputArg) === '[object String]';
}
function $isArguments(inputArg) {
return Object.prototype.toString.call(inputArg) === '[object Arguments]';
}
function $getItem(object, index) {
var item;
if ($isString(object)) {
item = object.charAt(index);
} else {
item = object[index];
}
return item;
}
var de = function (a, b, circ) {
if (a === b) {
return true;
}
var aType,
bType,
aIsArgs,
bIsArgs,
aIsPrim,
bIsPrim,
aCirc,
bCirc,
ka,
kb,
length,
index,
it;
if ($isDate(a) && $isDate(b)) {
return a.getTime() === b.getTime();
}
if ($isRegExp(a) && $isRegExp(b)) {
return a.source === b.source &&
a.global === b.global &&
a.multiline === b.multiline &&
a.lastIndex === b.lastIndex &&
a.ignoreCase === b.ignoreCase &&
a.sticky === b.sticky;
}
aIsPrim = $isPrimitive(a);
bIsPrim = $isPrimitive(b);
if ((aIsPrim || $isFunction(a)) && (bIsPrim || $isFunction(b))) {
/*jslint eqeq: true */
return a == b;
}
if (aIsPrim || bIsPrim) {
return a === b;
}
if (a.prototype !== b.prototype) {
return false;
}
if (circ.a.indexOf(a) === -1) {
circ.a.push(a);
} else {
aCirc = true;
}
if (circ.b.indexOf(b) === -1) {
circ.b.push(b);
} else {
bCirc = true;
}
if (aCirc && bCirc) {
circ.cnt += 1;
} else {
circ.cnt = 0;
}
if (circ.cnt > 200) {
throw new RangeError('Circular reference limit exceeded');
}
aIsArgs = $isArguments(a);
bIsArgs = $isArguments(b);
if ((aIsArgs && !bIsArgs) || (!aIsArgs && bIsArgs)) {
return false;
}
if (aIsArgs) {
return de(Array.prototype.slice.call(a), Array.prototype.slice.call(b), circ);
}
ka = Object.keys(a);
kb = Object.keys(b);
length = ka.length;
if (length !== kb.length) {
if (Array.isArray(a) && Array.isArray(b)) {
if (a.length !== b.length) {
return false;
}
} else {
return false;
}
} else {
ka.sort();
kb.sort();
for (index = 0; index < length; index += 1) {
if (ka[index] !== kb[index]) {
return false;
}
}
}
for (index = 0; index < length; index += 1) {
it = ka[index];
if (!de($getItem(a, it), $getItem(b, it), circ)) {
return false;
}
}
aType = typeof a;
bType = typeof b;
return aType === bType;
};
if (!Object.prototype.deepEqual) {
Object.defineProperty(Object.prototype, 'deepEqual', {
enumerable: false,
configurable: true,
writable: true,
value: function (b) {
var a = this;
return de(a, b, {
a: [],
b: [],
cnt: 0
});
}
});
}
if (!Array.prototype.unique) {
Object.defineProperty(Array.prototype, 'unique', {
enumerable: false,
configurable: true,
writable: true,
value: function (equalFn, thisArg) {
var object = Object(this),
length,
index,
eqFn,
arr,
idx,
val,
it;
if ($isUndefined(equalFn)) {
eqFn = $strictEqual;
} else {
eqFn = equalFn;
}
if (!$isFunction(eqFn)) {
throw new TypeError('Argument is not a function: ' + eqFn);
}
arr = [];
length = object.length >>> 0;
for (index = 0; index < length; index += 1) {
if (index in object) {
it = $getItem(object, index);
val = true;
for (idx = 0; idx < length; idx += 1) {
if (idx < index && idx in object && eqFn.call(thisArg, it, $getItem(object, idx))) {
val = false;
break;
}
}
if (val) {
arr.push(it);
}
}
}
return arr;
}
});
}
}());
var data1 = [1, 2, 2, 3, 3, 5, 5, 6, 6, 6],
data2 = [
['a', 'b', 'c'],
['a', 'b', 'c'],
['d', 'e', 'f'],
['g', 'h', 'i']
],
equals = Function.prototype.call.bind(Object.prototype.deepEqual),
pre = document.getElementById('out');
pre.textContent = JSON.stringify(data1.unique(equals), null, 2);
pre.textContent += '\n\n';
pre.textContent += JSON.stringify(data2.unique(equals), null, 2);
<pre id="out"></pre>

traversing a json for empty array value

i have a below json
{
"loanDetails": [
{
"vehicleDetail": {
"RCBookImageReferences": {
"imagePathReferences": [
{
}
]
}
},
"chargeDetails": [
{
}
],
"commissionDetails": [
{
}
],
"disbursementDetails": [
{
}
]
}
]
}
in the above json i need to traverse every key and if i find it emty then set the parent as empty array ie the output should be as below
{"loanDetails":[]}
i used the code below
function isEmpty(obj) {
for(var prop in obj) {
if(obj.hasOwnProperty(prop))
return false;
}
return true;
}
But it did not give me the expected result.I'm stuck here any help will be much helpful.

The function clean takes an object and loops over its keys, calling clean recursively
on each object-valued property.
If the result of cleaning is an empty object, delete the key in question.
If the object itself turns out to be empty, return undefined, triggering deletion of the property holding that object at the higher level.
function clean(obj) {
var isEmpty = true;
for (var key in obj) {
var val = obj[key];
if (val === null || typeof val !== 'object' || (obj[key] = clean(val))) {
isEmpty = false;
} else {
delete obj[key];
}
}
return isEmpty ? undefined : obj;
}
>> a = { x: 1, b: { y: [] }, c: { d: { } } }
>> clean(a)
<< Object {x: 1}

This should make it recursive. With two solutions.
Solution 1: empty test function
var boolValue = true;
for(var prop in obj) {
if(obj.hasOwnProperty(prop) && typeof obj[prop] === 'object')
{
boolValue = recursiveIsEmpty(obj[prop]);
}
else
{
return false;
}
}
return boolValue ;
//test and set empty string
recursiveIsEmpty(jsonDataObj['loanDetails']) ? jsonDataObj['loanDetails'] = [] : null;
Solution 2 recursive empty function that empties parent obj
function recursiveIsEmpty(obj) {
var boolValue = true;
for(var prop in obj) {
if(obj.hasOwnProperty(prop) && typeof obj[prop] === 'object')
{
boolValue = recursiveIsEmpty(obj[prop]);
if (boolValue)
{
delete obj[prop]; //an object is empty. Delete from parent;
}
}
else
{
return false;
}
}
return boolValue; //returns an empty object
}
recursiveIsEmpty(jsonDataObj['loanDetails']) //returns jsonDataObj['loanDetails'] = [];
This checks if obj has a property that is an object. If so load that object and check it's properties. If not return false, because that will be string or number and that confirms the object is not empty.

Your JSON-string is not valid. When corrected, you can use a reviver function parameter (see MDN) to remove 'empty' arrays (aka properties with criteria you specify).
To be clear, the reviver function takes care of the traversing on all levels of the parsed object. If it returns undefined the property is removed from the object. The reviver used in the snippet thus removes all properties containing arrays with empty objects, or empty arrays.
The snippet demonstrates this.
// json string corrected
var foo = '{"loanDetails": [{"vehicleDetail": {"RCBookImageReferences": '+
'{"imagePathReferences": [{}]}}, "chargeDetails": [{}],'+
'"commissionDetails": [{}],"disbursementDetails": [{}]}]}';
// parse it, using reviver parameter
var fooparsed = JSON.parse( foo,
function (key, value) { //<= reviver here
return (value.length && value.length == 1 &&
value[0] instanceof Object &&
Object.keys(value[0]).length == 0) ||
value instanceof Array && !value.length
? undefined : value;
}
);
// print
Helpers.log2Screen( Object.print(fooparsed) );
<script src="http://kooiinc.github.io/JSHelpers/Helpers-min.js"></script>

if you are doing this using ajax then you should go with seriallizing the jason array using javascript.
at the time of passing data through json
data: "your data",
use this
data:$(form).serialize(),
it will pass all the key of that form which you are passing ,
if you want to see its result the try to print it on console

var inputObj = {
"loanDetails": [{
"vehicleDetail": {
"RCBookImageReferences": {
"imagePathReferences": [{}]
}
},
"chargeDetails": [{}],
"commissionDetails": [{}],
"disbursementDetails": [{}]
}, {
"vehicleDetail": {
"RCBookImageReferences": {
"imagePathReferences": [{
"Valid": "Working"
}]
}
},
"chargeDetails": [{}],
"commissionDetails": [{}],
"disbursementDetails": [{}]
}],
"Superman": {
"Name": ""
},
"SpiderMan": {
"Name": "Senthil"
}
}
function flatten(target, opts) {
var output = {},
opts = opts || {},
delimiter = opts.delimiter || '.'
function getkey(key, prev) {
return prev ? prev + delimiter + key : key
};
function step(object, prev) {
Object.keys(object).forEach(function(key) {
var isarray = opts.safe && Array.isArray(object[key]),
type = Object.prototype.toString.call(object[key]),
isobject = (type === "[object Object]" || type === "[object Array]")
if (!isarray && isobject) {
return step(object[key], getkey(key, prev))
}
output[getkey(key, prev)] = object[key]
});
if (Object.keys(object) == "") {
if (object instanceof Array) {
output[prev] = [];
} else {
output[prev] = {};
}
}
};
step(target)
return output
};
function unflatten(target, opts) {
var opts = opts || {},
delimiter = opts.delimiter || '.',
result = {}
if (Object.prototype.toString.call(target) !== '[object Object]') {
return target
}
function getkey(key) {
var parsedKey = parseInt(key)
return (isNaN(parsedKey) ? key : parsedKey)
};
Object.keys(target).forEach(function(key) {
var split = key.split(delimiter),
firstNibble, secondNibble, recipient = result
firstNibble = getkey(split.shift())
secondNibble = getkey(split[0])
while (secondNibble !== undefined) {
if (recipient[firstNibble] === undefined) {
recipient[firstNibble] = ((typeof secondNibble === 'number') ? [] : {})
}
recipient = recipient[firstNibble]
if (split.length > 0) {
firstNibble = getkey(split.shift())
secondNibble = getkey(split[0])
}
}
// unflatten again for 'messy objects'
recipient[firstNibble] = unflatten(target[key])
});
//Array Check
var keys = Object.keys(result);
if (keys.length > 0 && keys[0] === "0") {
var output = [];
keys.forEach(function(key) {
output.push(result[key])
});
return output;
}
return result
};
var flatted = flatten(inputObj);
var keys = Object.keys(flatted);
keys.forEach(function(key) {
if (JSON.stringify(flatted[key]) === "{}" || JSON.stringify(flatted[key]) == "") {
// console.log(key)
delete flatted[key];
var paths = key.split(".");
if (paths.length >= 2) {
var int = parseInt(paths[1])
if (isNaN(int)) {
key = paths[0];
flatted[key] = {};
} else {
key = paths[0] + "." + int;
flatted[key] = {};
}
var newKeys = Object.keys(flatted);
for (var j = 0; j < newKeys.length; j++) {
var omg = newKeys[j];
if (omg.indexOf(key) != -1 && omg.length > key.length) {
delete flatted[key];
}
}
}
}
})
console.log(flatted)
var output = unflatten(flatted);
alert(JSON.stringify(output))

JS: How to return 'undefined' instead of throwing error 'cannot read property x of undefined'

What is the best way to have js return undefined rather than throw an error when a parent property does not exist?
Example
a = {}
b = a.x.y.z
// Error: Cannot read property 'value' of undefined
// Target result: b = undefined

You have to check for the existence of each property:
var b;
if (a.x && a.x.y && a.x.y.z) {
b = a.x.y.z
}
Or, simliar to another poster's "safeGet" function:
var get = function (obj, ns) {
var y = ns.split('.');
for(var i = 0; i < y.length; i += 1) {
if (obj[y[i]]) {
obj = obj[y[i]];
} else {
return;
}
}
return obj;
};
Use:
var b = get(a, 'x.y.z');

try {
a = {}
b = a.x.y.z
}
catch (e) {
b = void 0;
}

I would go for slightly verbose:
var b = ((a.x || {}).y || {}).z

you could write a safeGet helper function, something like:
edited for drilldown as suggested in comments by arcyqwerty
var getter = function (collection, key) {
if (collection.hasOwnProperty(key)) {
return collection[key];
} else {
return undefined;
}
};
var drillDown = function (keys, currentIndex, collection) {
var max = keys.length - 1;
var key = keys[currentIndex];
if (typeof collection === 'undefined') {
return undefined;
}
if (currentIndex === max) {
return getter(collection, key);
} else {
return drillDown(keys, currentIndex + 1,
getter(collection, key));
}
};
var safeGet = function (collection, key) {
if (key.indexOf(".") !== -1) {
return drillDown(key.split("."), 0, collection);
} else {
return getter(collection, key);
}
};
a = { x: 1 };
b = safeGet(a, 'x.y.z');
http://jsfiddle.net/YqdWH/2/