JSFiddle - React, Tailwind, and code Playground

JavaScript

function index(arr) {
    return arr.reduce(function(acc, item){
        return acc[JSON.stringify(item)] = item, acc
    }, {})    
}

var arrayA = []; 
arrayA[0] = [];  
arrayA[0]["stName"] = "Aby";
arrayA[0]["stId"] = "E44";
arrayA[1] = [];  
arrayA[1]["stName"] = "Emy";
arrayA[1]["stId"] = "E55";
arrayA[2] = [];  
arrayA[2]["stName"] = "Jan";
arrayA[2]["stId"] = "E6";

/* Want to remove arrayB from arrayA */
var arrayB = []; 
arrayB["stName"] = "Emy";
arrayB["stId"] = "E55";

var indexB = index(arrayB);

arrayA = arrayA.filter( function( el ) {
  return !(JSON.stringify(el) in indexB);
} );

console.log(arrayA);