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function myConcat(separator) {
  var result = ""; // initialize list
  var i;
  // iterate through arguments
  for (i = 1; i < arguments.length; i++) {
    result += arguments[i] + separator;
  }
  return result;
}

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// Flatten an Array of Arrays without using .flat()
function flatten(array) {
  return array.reduce((acc, item) => {
    if (Array.isArray(item)) {
      acc = acc.concat(flatten(item));
    } else {
      acc.push(item);
    }

    return acc;

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document.getElementById("app").innerHTML = `
<h1>Hello Vanilla!</h1>
<div>
  We use the same configuration as Parcel to bundle this sandbox, you can find more
  info about Parcel 
  <a href="https://parceljs.org" target="_blank" rel="noopener noreferrer">here</a>.
</div>
`;
var marks = { physics: 98, maths: 95, chemistry: 91 };

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// 1. ID base case
// 2. ID recursive case
// 3. Return where appropriate
// 4. Write procedures that bring you closer to base case

// Simple factorial example with Recursion
const factorial = n => {
  return n < 2 ? 1 : n * factorial(n - 1);
};

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// Use .bind() when you want that function to later be called
// with a certain context, useful in events.
// Use .call() or .apply() when you want to invoke the
// function immediately, with modification of the context.

// implement Function.prototype.bind()

/*
  const foo = function() {
    console.log(this.bar);

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/*
  Hi there! Thanks for taking on this code test. The requirements are listed below:
  
  1. Create a "Foods" class or constructor that will take two arguements: a root element and a data object (foodData).
  2. Render all of the items in the data object into the DOM with the root element as the parent
  3. If the user clicks a food item, it should be removed from the list
  
  Rules:
  - Only vanilla JS
  - Feel free to use Google, Bing, DuckDuckGo to look things up

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// Reduce can be used to sum all products
const products = [{ price: 1 }, { price: 2 }, { price: 3 }, { price: 4 }];

function sumAllPrices(products) {
  return products.reduce((sum, product) => sum + product.price, 0);
}

sumAllPrices(products); // 425

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const a = [1, 2, 3];
const b = [4, 5, 6];
const c = [1, 2, 3];

function arrayEquals(a, b) {
  return (
    Array.isArray(a) &&
    Array.isArray(b) &&
    a.length === b.length &&
    a.every((val, index) => val === b[index])