How to iterate map values in Lightning Web Components(lwc)

This post explains how to iterate map values in Lightning web components(lwc)

Demo:

Apex Class

public inherited sharing class LWCExampleController {
    @AuraEnabled(cacheable=true)    
    public static map<String, String> returnMapOfValues() {
        map<String, String> mapOfValues = new map<String, String>();
        mapOfValues.put('Telanagana', 'Hyderabad');
        mapOfValues.put('Arunachal Pradesh', 'Itanagar');
        mapOfValues.put('Assam', 'Dispur');
        mapOfValues.put('Bihar', 'Patna');
        mapOfValues.put('Gujarat', 'Gandhinagar');
        return mapOfValues;
    }
}

showMapLWCDemo.html

<template>
    <lightning-card title="Iterate Map Values Demo">
        <template if:true={mapOfValues}>
            <table class="slds-table slds-table_bordered slds-table_cell-buffer slds-table_col-bordered">
                <thead>
                    <tr class="slds-text-title_caps">
                        <th scope="col">
                            <div title="Key">State Name (Key)</div>
                        </th>
                        <th scope="col">
                            <div title="Value">Capital City Name (Value)</div>
                        </th>
                    </tr>
                </thead>
                <tbody>
                    <template for:each={mapOfValues} for:item="keyValue">
                        <tr key={keyValue.key}>
                            <th scope="col">
                                <div>{keyValue.key}</div>
                            </th>
                            <th scope="col">
                                <div>{keyValue.value}</div>
                            </th>
                        </tr>
                    </template>
                </tbody>
            </table>
        </template>

    </lightning-card>
</template>

showMapLWCDemo.js

import { LightningElement, track, wire } from 'lwc';
import getMapOfData from '@salesforce/apex/LWCExampleController.returnMapOfValues';

export default class ShowMapLWCDemo extends LightningElement {
    @track mapOfValues = [];

    @wire(getMapOfData)
    mapOfData({data, error}) {
        if(data) {
            for(let key in data) {
                // Preventing unexcepted data
                if (data.hasOwnProperty(key)) { // Filtering the data in the loop
                    this.mapOfValues.push({value:data[key], key:key});
                }
            }
        }
        else if(error) {
            window.console.log(error);
        }
    }
}

showMapLWCDemo.js-meta.xml

<?xml version="1.0" encoding="UTF-8"?>
<LightningComponentBundle xmlns="http://soap.sforce.com/2006/04/metadata" fqn="showMapLWCDemo">
    <apiVersion>45.0</apiVersion>
    <isExposed>true</isExposed>
    <targets>
        <target>lightning__AppPage</target>
        <target>lightning__RecordPage</target>
        <target>lightning__HomePage</target>
    </targets>
</LightningComponentBundle>

Result

How to check field exists or not on sobject using Apex?

Some scenarios, we need to validate field is exists or not on the object.
use below simple code it checks the field on an object if the field has existed on the object it returns true otherwise it returns false.

Example:

Boolean bHasField = Account.getSobjectType().getDescribe().fields.getMap().keySet().contains('phone');
System.debug('bHasField =====> '+bHasField);

Result:

How to use custom metadata type values in Process Builder

In the Summer 19 release, Salesforce introduced the option to use custom metadata type values in process builder, formulas, and validation rules.

if you don't have pre-release dev org, sign up using below link
https://www.salesforce.com/form/signup/prerelease-summer19/

Syntax to use Metadata value in Formulas

$CustomMetadata.CustomMetadataTypeAPIName.RecordAPIName.FieldAPIName

Example
I created the Account_Generic_Data__mdt for this demo.

and created the Value__c filed on Account Generic Data Custom metadata type.
and I created the record

To Use this value in formulas and process builders
Example:

$CustomMetadata.Account_Generic_Data__mdt.Acc_Minimum_Amount.Value__c 

Resource:
https://releasenotes.docs.salesforce.com/en-us/summer19/release-notes/rn_forcecom_development_custom_metadata_process_builder.htm?edition=&impact=