JavaScript optimization techniques that cannot be ignored in the project Null, Undefined, null check exist in multiple conditions to determine the trinomial operator null/undefined check and assign default value arrow function extension operator

<h1 class="pgc-h-arrow-right" data-track="1" >Null, Undefined, null check</h1>

Common notation:

After optimization:

<h1 class="pgc-h-arrow-right" data-track="6" > judgment that there are multiple conditions</h1>

<h1 class="pgc-h-arrow-right" data-track="11" > trinomial operator</h1>

<h1 class="pgc-h-arrow-right" data-track="16" > empty/undefined checks and assigns default values</h1>

<h1 class="pgc-h-arrow-right" data-track="21" > arrow function</h1>

Optimized post-write:

<h1 class="pgc-h-arrow-right" data-track="26" > extension operator</h1>