Develop Reference

Set same function to multiple objects in javascript

I have a list of objects like this
var obj = [
{ name: "user", per: { pu: [{ end: "foo" }], ge: [{ end: "bar" }] } },
{ name: "user2", per: { pu: [{ end: "foo2" }], ge: [{ end: "bar2" }] } }
];
I want to add a new property cond which is a function to the objects in pu and ge, but when i do this, the function set to the only last object.
I loop through them then set them like so obj[0].per[itm][0].cond = func and that set to the last object only, but when i try to convert function toString() it set to all, JSON.stringfy() works as func same behavior.
Have I clone or set it in another way?

You may need to post fuller code as it's difficult to see where your error is. However, considering it from scratch, I think some nested loops to match the nested arrays will get you there.
for (let o of obj) {
for (let puObj of o.per.pu) {
puObj.cond = func;
}
for (let geObj of o.per.ge) {
geObj.cond = func;
}
}

use the below function...
const updateObject = (oldObject, updatedProperties) => {
return {
...oldObject,
...updatedProperties
}
};
then you can pass in your new function or anything you need to add like this:
obj[index].per = updateObject(obj[index].per, {cond : function() {}} ); //use a loop to add the function to all objects in array
//check your current obj
console.log(obj);

How to add attribute to the root of JSON object consists of array of objects?

How to add attribute to the root of JSON object consists of array of objects?
If my JSON object something like that:
[
{
"Id":"f2ac41c5-b214-48f6-ad40-9fc35c1aaad9",
"Name":"W",
"NumberOfWorkHours":8,
"NumberOfShortDays":1,
"WorkTimeRegulationId":"f5833075-2847-4cc3-834d-6138dd0dcd99"
},
{
"Id":"5c267601-fcf2-4735-9e49-b4def3981648",
"Name":"S",
"NumberOfWorkHours":6,
"NumberOfShortDays":0,
"WorkTimeRegulationId":"8d14580e-278f-41d1-9239-8874be792580"
}
]
I do the following:
worktimeJSON.Id = $('.Js-WorkTime-id').val();
worktimeJSON.Name = $('.Js-WorkTime-name').val();
worktimeJSON.NumberOfAvailableRotations = $('.Js-WorkTime-rotations').val();
And make sure that the jQuery fetching data from the inputs but this doesn't work.

This will change property of all object in array if you want to change in particular then use index for this for exp->
worktimeJSON[0].Id = $('.Js-WorkTime-id').val();
worktimeJSON[0].Name = $('.Js-WorkTime-name').val();
worktimeJSON[0].NumberOfAvailableRotations = $('.Js-WorkTime-rotations').val();
var worktimeJSON = [
{
"Id":"f2ac41c5-b214-48f6-ad40-9fc35c1aaad9",
"Name":"W",
"NumberOfWorkHours":8,
"NumberOfShortDays":1,
"WorkTimeRegulationId":"f5833075-2847-4cc3-834d-6138dd0dcd99"
},
{
"Id":"5c267601-fcf2-4735-9e49-b4def3981648",
"Name":"S",
"NumberOfWorkHours":6,
"NumberOfShortDays":0,
"WorkTimeRegulationId":"8d14580e-278f-41d1-9239-8874be792580"
}
];
worktimeJSON = worktimeJSON.map(function(val){
val.Id = $('.Js-WorkTime-id').val();
val.Name = $('.Js-WorkTime-name').val();
val.NumberOfAvailableRotations = $('.Js-WorkTime-rotations').val();
return val;
});

Push can do the job.
let worktimeJSON = [
{
"Id":"f2ac41c5-b214-48f6-ad40-9fc35c1aaad9",
"Name":"W",
"NumberOfWorkHours":8,
"NumberOfShortDays":1,
"WorkTimeRegulationId":"f5833075-2847-4cc3-834d-6138dd0dcd99"
},
{
"Id":"5c267601-fcf2-4735-9e49-b4def3981648",
"Name":"S",
"NumberOfWorkHours":6,
"NumberOfShortDays":0,
"WorkTimeRegulationId":"8d14580e-278f-41d1-9239-8874be792580"
}
];
worktimeJSON.push
({
id: "someID",
name: "toto",
WorkTimeRegulationId: 42
});
console.log(worktimeJSON);

I structure my object like this:
let WorkTimeRegulationViewModelJSON = {
Id: $('.Js-WorkTimeRegulation-id').val(),
Name: $('.Js-WorkTimeRegulation-name').val(),
NumberOfAvailableRotations: $('.Js-WorkTimeRegulation-rotations').val(),
AssignedWorkTimes: JSON.parse(worktimeJSON)
};

can you get var name from object with nested objects with lodash?

https://jsfiddle.net/adamchenwei/Lyg2jy61/7/
RESOLVED VERSION:
https://jsfiddle.net/adamchenwei/Lyg2jy61/10/
For some reason findKey for parent top level got undefined
My objective is to get the result = 'myName' with lodash;
var obj = {
myName: {
Adam: 'Man',
},
herName: {
Eve: 'Woman',
},
};
var result = _.findKey(obj, '0'); //as you can see somehow its undefined!
var result2 = _.findKey(obj.myName, '0');
console.log(result);//objective is to get the result = 'myName' with lodash;
console.log(result2);
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.16.4/lodash.min.js"></script>

It looks like what you're actually trying to do is get the first key of an object. To get the keys of an object, you can use _.keys. Then just retrieve the first one.
var obj = {
myName: {
Adam: 'Man',
},
herName: {
Eve: 'Woman',
},
};
console.log(_.keys(obj)[0]);
// Or if you want to do it exclusively with lodash functions
console.log(_.first(_.keys(obj)));
// or
console.log(_.head(_.keys(obj)));
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.16.4/lodash.min.js"></script>

It's not clear what you're after exactly, but using _.findKey on the object you have posted would work like this:
https://jsfiddle.net/Lyg2jy61/8/
var obj = {
myName: {
Adam: 'Man',
},
herName: {
Eve: 'Woman',
}
};
console.log(_.findKey(obj, function(o) { return !!o.Adam; }));
If you just want the first key: _.keys(obj)[0]

Cannot read property 'concat' of undefined

to begin with, I have a multilevel of entities as in
country unit ----> customer reporting group ----> customers
each country unit has different customer reporting groups and each of the later has different customers
in the code the variable names are
cu ----> crg ---> customer
this is represented in a multilevel object called menuData:
menuData = {
cu1: {
CRG3: {
Customer1: {},
Customer5: {}
},
CRG7: {
Customer3: {},
Customer2: {},
Customer7: {}
}
},
cu4: {
CRG1: {
Customer2: {},
Customer4: {}
},
CRG3: {
Customer4: {}
}
}
};
what I wanted to do is to construct unique id for each level in a multilevel objects as well as in for example the ids for the customer units will be the same
cu1 and cu2 and so on
for the customer reporting groups the ids will consist of the cu + the crg as in
cu1+crg4
for the customer:
cu1+crg4+customer6;
what I did is a function called getIds
var getIds = function(menuData) {
var ids = {};
for (cu in menuData) {
ids[cu] = cu;
for (crg in menuData[cu]) {
if (!(ids[cu] in ids)) {
ids[cu] = {};
ids[cu][crg] = ids[cu].concat(crg);
} else ids[cu][crg] = ids[cu].concat(crg);
for (customer in menuData[cu][crg]) {
if (!ids[cu][crg]) {
ids[cu][crg] = {};
ids[cu][crg][customer] = ids[cu][crg].concat(customer);
} else ids[cu][crg][customer] = ids[cu][crg].concat(customer);
}
}
}
console.log(ids);
return ids;
};
the error I got is
Cannot read property 'concat' of undefined
what I have tried is that, because it says that it's undefined, I try to define it if its not already defined as in
if (!(ids[cu] in ids)) {
ids[cu] = {};
ids[cu][crg] = ids[cu].concat(crg);
}
if its not defined, define it and insert the value, but if its defined, only assign the value
else ids[cu][crg] = ids[cu].concat (crg );
why do I get this error? and how to get the the ids in multilevel objects ?
edit, excpected output is
ids = {
"cu1": {
"cu1+CRG3": { "cu1+CRG3+Customer1":{}, "cu1+CRG3+Customer5":{} },
"cu1+CRG7": { "cu1+CRG7+Customer3":{}, "cu1+CRG7+Customer2":{}, "cu1+CRG7+Customer7":{} }
},
"cu4": {
"cu4+CRG1": { "cu4+CRG1+Customer2":{}, "cu4+CRG1+Customer4":{} },
"cu4+CRG3": { "cu4+CRG3+Customer4":{}}
}
}

The Problem with your Code is that you are using Objects to store your data and Objects don´t have the Method "concat" only Arrays have the "concat" Method. Your Object must look like these to work:
menuData = [
"cu1": [
"CRG3": [ "Customer1":{}, "Customer5":{} ],
"CRG7": [ "Customer3":{}, "Customer2":{}, "Customer7":{} ]
],
"cu4": [
"CRG1": [ "Customer2":{}, "Customer4":{} ],
"CRG3": [ "Customer4":{}]
]
]
Here´s a reference : MDN Array.concat()
What can be confusing in JS is that an Object Property can be accessed like an Array.
Update after Expected Output was added:
okay than i think concat is not the right solution for your Problem.
Try it with something like this:
var ids = {};
var menuData = {
cu1: {
CRG3: {
Customer1: {},
Customer5: {}
},
CRG7: {
Customer3: {},
Customer2: {},
Customer7: {}
}
},
cu4: {
CRG1: {
Customer2: {},
Customer4: {}
},
CRG3: {
Customer4: {}
}
}
};
for (propKeyLevel1 in menuData){
ids[propKeyLevel1] = {};
var propLevel1 = ids[propKeyLevel1];
for(propKeyLevel2 in menuData[propKeyLevel1]){
propLevel1[propKeyLevel1+"+"+propKeyLevel2] = {};
var propLevel2 = propLevel1[propKeyLevel1+"+"+propKeyLevel2];
for(propKeyLevel3 in menuData[propKeyLevel1][propKeyLevel2]){
propLevel2[propKeyLevel1+"+"+propKeyLevel2+"+"+propKeyLevel3] = {};
}
}
}
console.log(ids);

concat is a method for for a String or an Array, here you call it on an object hence the error.
What you're trying to do is a bit unclear to me, but maybe you could try that :
ids[cu][crg] = crg;
instead of :
ids[cu][crg] = ids[cu].concat (crg );
Because that's what you seem to be trying.

I’d try it this way:
function getIds(dataIn, idsIn) {
idsIn = idsIn || [];
var dataOut = {}, idOut;
for (var idIn in dataIn) {
idsOut = idsIn.concat([idIn]);
dataOut[idsOut.join('+')] = getIds(dataIn[idIn], idsOut);
}
return dataOut;
}
Perfect use case for a recursive function passing down an array (idsOut) of the ids of the previous layers to generate the intended object keys. Pretty straight forward.

Assign methods to object by iterating over an array

In ES5, I know that it's possible to assign methods to an object using a forEach loop in the following way:
var myMethods = [
{
name: 'start',
src: someFn
},
{
name: 'stop',
src: someOtherFn
}
];
var myObject = {};
myMethods.forEach(function(method) {
myObject[method.name] = method.src;
});
In ES2015 (or ES6), is it possible to define these methods in tandem with creating the object? Here is an example of how I might expect this to work:
// example
const myObject = {
[...myMethods.map((method) => method.name)]: [...myMethods.map(method) => method.src)]
}
The end result would look like this:
const myObject = {
start: someFn,
stop: someOtherFn
}
If there is a way to iterate over these methods and assign them to myObject, I would happily restructure the myMethods array so that this is possible.
The end goal is to be able to assign each of these methods in an external module and not have to duplicate the definition.

Yes, you can use Object.assign and the spread operator in conjunction with computed property names to do
var myObject = Object.assign({}, ...myMethods.map(({name, src}) => ({[name]: src})));
First we map myMethods to an array of little one-property objects, whose key is given by the value of the name property and value by the src property. Then we use the spread operator ... to pass these to Object.assign as parameters. Object.assign then glues them all together for us.

Reduce should do the trick for you. Note that the optional second parameter is used to start with an empty object at the beginning.
var myMethods = [{
name: 'start',
src: function() {
console.log('started')
}
}, {
name: 'stop',
src: function() {
console.log('stopped')
}
}];
var myObject = myMethods.reduce((obj, method) => {
obj[method.name] = method.src;
return obj;
}, {})
console.log(myObject)
myObject.start()
myObject.stop()

Try assigning to myObject at same line of myMethods assignnemts
var myObject = {};
someFn = function(){console.log(this)};
someOtherFn = function(){console.log(this)};
var myObject = {};
someFn = function(){};
someOtherFn = function(){}
var myMethods = [
{
name: (myObject["start"] = "start"),
src: (myObject["start"] = someFn)
},
{
name: (myObject["stop"] = "stop"),
src: (myObject["stop"] = someOtherFn)
}
];