JSFiddle - React, Tailwind, and code Playground

by jfriend00

JavaScript

var arrays = [
    ['valueOf', 'toString','apple', 'orange', 'banana', 'banana', 'pear', 'fish', 'pancake', 'taco', 'pizza'],
    ['valueOf', 'toString','taco', 'fish', 'fish', 'apple', 'pizza'],
    ['valueOf', 'toString','banana', 'pizza', 'fish', 'apple', 'apple']
    ];


function containsAll(/* pass all arrays here */) {
    var output = [];
    var cntObj = {};
    var array, item, cnt;
    // for each array passed as an argument to the function
    for (var i = 0; i < arguments.length; i++) {
        array = arguments[i];
        // for each element in the array
        for (var j = 0; j < array.length; j++) {
            item = "-" + array[j];
            cnt = cntObj[item] || 0;
            // if cnt is exactly the number of previous arrays, 
            // then increment by one so we count only one per array
            if (cnt == i) {
                cntObj[item] = cnt + 1;
            }
        }
    }
    // now collect all results that are in all arrays
    for (item in cntObj) {
        if (cntObj.hasOwnProperty(item) && cntObj[item] === arguments.length) {
            output.push(item.substring(1));
        }
    }
    return(output);
}    

var result = containsAll.apply(this, arrays);

document.body.innerHTML = "<pre>[<br>    " + result.join(',<br>    ') + "<br>]</pre>";