JSFiddle - React, Tailwind, and code Playground

HTML

<p id="a1"/>
<p id="a2"/>

JavaScript

var a1 = [1,2,3,4,5];

var pos = $.inArray(3,a1);

a1.splice(pos);

$("#a1").text("array1: " + a1);

var a2 = [1,2,3,4,5];

pos = $.inArray(3, a2);

a2.splice(pos,1);

$("#a2").append("array2: " + a2);