Probably not a good idea: normalize array of objects in Craft

getnews.twig

{# variables #}
{% set allNews = [] %}
{% set today = "now"|date("Y-m-d") %}

{# create custom allNews array of objects #}
{% set news = craft.entries()
  .section(["news"])
  .with([
    "newsImage"
  ])
  .orderBy("postDate DESC")
  .limit(8)
  .all() %}
{% for item in news %}
  {% set thumbSmall = item.newsImage[0].getUrl({ width: 600, height: 450 }) ?? null %}
  {% set thumbMedium = item.newsImage[0].getUrl({ width: 800, height: 600 }) ?? null %}
  {% set allNews = allNews|merge([{
    thumbSmall: thumbSmall,
    thumbMedium: thumbMedium,
    title: item.commonTitle,
    url: item.url,
    displayDate: item.postDate|date("Y-m-d"),
    sortDate: item.postDate|date("U"),
    typeFormatted: "News",
    cssClass: "c-news--news"
  }]) %}
{% endfor %}
{% set events = craft.entries()
  .section(["events"])
  .with([
    "eventsImage"
  ])
  .orderBy("eventStartDate DESC")
  .eventEndDate(['and', ">= #{today}"])
  .limit(8)
  .all() %}
{% for item in events %}
  {% set thumbSmall = item.eventImage[0].getUrl({ width: 600, height: 450 }) ?? null %}
  {% set thumbMedium = item.eventImage[0].getUrl({ width: 800, height: 600 }) ?? null %}
  {% set allNews = allNews|merge([{
    thumbSmall: thumbSmall,
    thumbMedium: thumbMedium,
    title: item.commonTitle,
    url: item.url,
    displayDate: item.eventStartDate|date("Y-m-d"),
    sortDate: item.eventStartDate|date("U"),
    typeFormatted: "Event",
    cssClass: "c-news--event"
  }]) %}
{% endfor %}
{% set videos = craft.entries()
  .section(["videos"])
  .with([
    "videoImage"
  ])
  .orderBy("postDate DESC")
  .limit(8)
  .all() %}
{% for item in videos %}
  {% set thumbSmall = item.eventImage[0].getUrl({ width: 600, height: 450 }) ?? null %}
  {% set thumbMedium = item.eventImage[0].getUrl({ width: 800, height: 600 }) ?? null %}
  {% set allNews = allNews|merge([{
    thumbSmall: thumbSmall,
    thumbMedium: thumbMedium,
    title: item.commonTitle,
    url: item.url,
    displayDate: item.postDate|date("Y-m-d"),
    sortDate: item.postDate|date("U"),
    typeFormatted: "Vidéo",
    cssClass: "c-news--video"
  }]) %}
{% endfor %}

{# sort and slice #}
{% set allNews = allNews|sort((a, b) => a.sortDate < b.sortDate) %}
{% set allNews = allNews|slice(0,8) %}

{# display (@TODO: replace by a component using custom objects) #}
{% for item in allNews %}
  <p>{{ item.displayDate }} - {{ item.typeFormatted }} - {{ item.title }}</p>
{% endfor %}

@brettburwell yes that's another / cleaner approach, thank you for posting it. I now have a version where I just do one big for loop like you do with a switch / case on the entry type. Cleaner indeed.

Got an event simpler way of dealing with that with the help of Brandon and by taking advantage of the possibility to use raw SQL in the order clause:

{% set eventSection = craft.app.sections.getSectionByHandle('events') %}
{% set today = 'now'|date_modify("-1 month")|date('Y-m-d') %}

{% set allNews = craft.entries()
  .section(['news', 'events', 'videos'])
  .eventEndDate(['or', ':empty:', ">= #{today}"])
  .orderBy(
    expression('(
      CASE
        WHEN sectionId = :eventSectionId THEN field_eventStartDate
        ELSE postDate
      END
    ) DESC', {
      eventSectionId: eventSection.id
    })
  )
  .with([
    'newsImage',
    'eventsImage',
    'videoImage',
  ])
  .all()
%}

Nice. That definitely tightens things up even more. Thanks for sharing @jeromecoupe!