JSFiddle - React, Tailwind, and code Playground

JavaScript

$(function() {
  var arr = [];
  arr.push([0,1]);
  arr.push([2,1]);
  arr.push([3,1]);
  arr.push([4,1]);
  arr.push([5,1]);
  
  if(jQuery.inArray("2,1",arr)) {
    alert("not there");
  }
  
});