Zara  Bryant

Zara Bryant

1548208380

How to push additional fields to a javascript array from an oData result

I have a ramdom array in javascript

var dataModel = [];

I've queried an oData url and I want to fill the result in my dataModel [] array. And, for each item I want to add additional fields

odataMod.read(
        "/",
        null, [],
        true,
        function (oData, oResponse) {
            var data = oData.results;
        data.forEach(function (item) {
            //Add the object 
            dataModel.push(item);
            //I want to add additional fields to every object in data 
            dataModel.push(item.ObjectType = "Chevron");
            dataModel.push(item.HierarchyNodeLevel = 0);
            dataModel.push(item.IsCriticalPath = false);
            dataModel.push(item.IsProjectMilestone = false);
            dataModel.push(item.DrillDownState = "expanded");
            dataModel.push(item.Magnitude = 5);


Note : the ObjectType , DrillDownState , Magnitude (etc…) are the fields that I want to add with their values Chevron, 0, false (etc…)

Below is a screenshot of the current result :

But I want to add the additional properties inside each item and not outside , what I am doing wrong? In other word, I want the additional fields to be inside the metadata

Below is a sc of where I would like to add the items :


#javascript #arrays

What is GEEK

Buddha Community

Brooke Giles

1548665928

Maybe I’m misunderstanding, but I think you want only one push per item in the response. The other pushes ought to be replaced with setting properties on a copy of the item…

        data.forEach(function (item) {
            item.ObjectType = "Chevron";
            item.HierarchyNodeLevel = 0;
            item.IsCriticalPath = false;
            item.IsProjectMilestone = false;
            item.DrillDownState = "expanded";
            item.Magnitude = 5;
            dataModel.push(item);  // note: just one push

            // alternatively, so as to not mutate item...
            // const dataModelItem = Object.assign({
            //    ObjectType: "Chevron",
            //    HierarchyNodeLevel: 0,
            //    etc.
            // }, item);
            // dataModel.push(dataModelItem);
        }

Lowa Alice

Lowa Alice

1624388400

JavaScript Arrays Tutorial. DO NOT MISS!!!

Learn JavaScript Arrays

📺 The video in this post was made by Programming with Mosh
The origin of the article: https://www.youtube.com/watch?v=oigfaZ5ApsM&list=PLTjRvDozrdlxEIuOBZkMAK5uiqp8rHUax&index=4
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Thanks for visiting and watching! Please don’t forget to leave a like, comment and share!

#arrays #javascript #javascript arrays #javascript arrays tutorial

Zara  Bryant

Zara Bryant

1548208380

How to push additional fields to a javascript array from an oData result

I have a ramdom array in javascript

var dataModel = [];

I've queried an oData url and I want to fill the result in my dataModel [] array. And, for each item I want to add additional fields

odataMod.read(
        "/",
        null, [],
        true,
        function (oData, oResponse) {
            var data = oData.results;
        data.forEach(function (item) {
            //Add the object 
            dataModel.push(item);
            //I want to add additional fields to every object in data 
            dataModel.push(item.ObjectType = "Chevron");
            dataModel.push(item.HierarchyNodeLevel = 0);
            dataModel.push(item.IsCriticalPath = false);
            dataModel.push(item.IsProjectMilestone = false);
            dataModel.push(item.DrillDownState = "expanded");
            dataModel.push(item.Magnitude = 5);


Note : the ObjectType , DrillDownState , Magnitude (etc…) are the fields that I want to add with their values Chevron, 0, false (etc…)

Below is a screenshot of the current result :

But I want to add the additional properties inside each item and not outside , what I am doing wrong? In other word, I want the additional fields to be inside the metadata

Below is a sc of where I would like to add the items :


#javascript #arrays

Coy  Roberts

Coy Roberts

1600671600

Javascript array push: How to Add Item in Javascript Array

Javascript array push() an inbuilt function that adds a new element at the end of an array and returns the new length of an array. The push() method modifies the length of the Array or collection. Arrays are kind of list objects whose prototype has methods to perform the mutation operations. Neither the length of a JavaScript array nor the types of its elements are fixed.

We can add new items in the Array using the following approach.

  1. Javascript array push() method is used to add items at the end of an array.
  2. Javascript array unshift() method is used to add items at the beginning of an array.
  3. Javascript array splice()  method is used to add elements within the Array.

So, in this example, we will see how we can perform javascript add to  array operation.

Understanding Javascript Array push()

Javascript array push() is an inbuilt method that can be used to append a  number,  string,  object, Array, or any value to the Array. JavaScript arrays are used to store multiple values in a single variable. An array data structure can hold many values under a single name, and you can access those values by referring to the index number.

Let us see the syntax of the Javascript Array push() method.

#javascript #javascript array push #js

Terry  Tremblay

Terry Tremblay

1602154740

Fill and Filter in Array in JavaScript

By the word Array methods, I mean the inbuilt array functions, which might be helpful for us in so many ways. So why not just explore and make use of them, to boost our productivity.

Let’s see them together one by one with some amazing examples.

Array.fill():

The _fill()_ method changes all elements in an array to a static value, from a start index (default _0_) to an end index (default _array.length_). It returns the modified array.

In simple words, it’s gonna fill the elements of the array with whatever sets of params, you pass in it. Mostly we pass three params, each param stands with some meaning. The first param value: what value you want to fill, second value: start range of index(inclusive), and third value: end range of index(exclusive). Imagine you are going to apply this method on some date, so that how its gonna look like eg: array.fill(‘Some date’, start date, end date).

NOTE: Start range is inclusive and end range is exclusive.

Let’s understand this in the below example-

//declare array
var testArray = [2,4,6,8,10,12,14];

console.log(testArray.fill("A"));

When you run this code, you gonna see all the elements of testArray will be replaced by 'A' like [“A”,"A","A","A","A","A","A"].

#javascript-tips #array-methods #javascript-development #javascript #arrays

Cayla  Erdman

Cayla Erdman

1597470780

A quick guide to JavaScript Arrays

Introduction

Arrays are a structure common to all programming languages so knowing what they are and having a firm grasp on what you’re able to accomplish with Arrays will take you a long way in your journey as a software developer. The code examples I share in this post will be in JavaScript but the concepts are common among all languages. What you learn here can easily be translated to any other language you work with.

In this post I’ll be covering how to perform the create, read update and delete operations using arrays, some common functions that come with the Array prototype and also how to implement them.


What is an Array

Before we jump into the juicy bits of Arrays, lets quickly gloss over what they are. Arrays

  • are a fundamental data type in JavaScript
  • are an ordered collection of values called **elements **that are stored at and accessed via an index
  • are untyped, meaning that the elements of an array could be of different types. This allows us to create complex arrays such as an array of objects or even an array of arrays (multidimensional arrays)
  • can have elements that are constants or expressions
  • have a property called length that tells you the number of elements in the array
  • inherit properties from Array.prototype that includes a wide variety useful functions that can be called from arrays or array-like objects

CRUD operations using Arrays

If you’re not familiar with the term CRUD it stands for Create, Read, Update and Delete. In this section we’ll go through each one of these operations and cover different ways you can perform each one.

Creating Arrays

There are several ways you can create an Array but the most common ways are by using

  • the Array literal syntax
  • the Array constructor i.e. new Array()

Lets take a look at each one with examples

Array literal

The array literal is the most common way of creating an array. It uses the square brackets as a notion of a container followed by comma separated values inside the square brackets. The following examples show how to use the array literal syntax and how arrays are untyped i.e. can contain elements of different types.

Image for post

Examples of untyped arrays in JavaScript created with the array literal syntax.

Array constructor

Another way to create an array is through the Array constructor.

const myArray = new Array();

Using the Array constructor, as shown above, is the same as creating an array with the array literal syntax. i.e.

// The following two lines behave exactly the same way i.e. both create an empty arrays

const myArray = new Array();
const myOtherArray = [];

The array constructor, however, is able to receive arguments that allow it to behave in different ways depending on the number and type of arguments passed to it.

  • You can pass a single numeric argument which creates an array of the specified length. This option is mostly used when you know how many elements you’ll be placing in the array
const myArray = new Array(5);

Note: If you want to define the array with a specified size, as shown above, the argument passed must be a numeric value. Any other type would be considered as the first element that’ll be placed in the array.

  • Or you can pass two or more arguments or a non-numeric argument to place the values inside the array. This works the same way as shown in the array literal examples.

Image for post

Examples of arrays created by using the Array constructor in JavaScript

As stated earlier, these two ways are the most common ways of creating arrays that you’ll see and use 99% of the time. There are a few other ways but we won’t dive deep into how they work. They are

  • the spread operator const someArray = […someOtherArray]
  • the static method Array.of()
  • and the static method Array.from()

#javascript #web-development #javascript-tips #javascript-development #javascript-arrays #sql