Jeetu Anupam

Benjamin Franklin took things a big step ahead. He came up with the idea that electricity had positive and negative elements and that electricity flowed between these elements. He also believed that lightning was a form of this flowing electricity. In 1752, Franklin conducted his famous kite experiment.

If you’re planning to go abroad soon, you’ll need to have access to foreign currency. While you could make all your purchases with a credit or debit card, you run the risk of wasting too much money on foreign transaction fees. One way to avoid that is to exchange currency and carry around cash. Unfortunately, sometimes getting access to foreign funds can be expensive. If you’re on a mission to save money, here are the cheapest ways to purchase foreign currency.

Many banks and credit unions offer a foreign currency exchange service for a fee. Some financial institutions will even order currency, or allow you to order it online, and ship it to your home. That may be a convenient way to get the money you need for your trip. However, if you have to pay shipping fees, you could lose a lot of money in the process.

A cheaper way to get access to foreign currency is to buy it from your local bank branch in person. You may not have to pay a fee at all, as a loyal customer. Plus, larger banks often get access to the best exchange rates. The process is pretty simple and you could be able to exchange the money you need in the matter of minutes.

Another option, if you’re unable to go to a bank branch before it’s time to leave, is to stop by an ATM. As long as it’s within your bank’s network, you should have to pay little to no fees for your withdrawals, if the ATM is able to process foreign transactions. If not, you could take U.S. cash out and plan on exchanging it for the going rate when you enter the country.

You can also find out whether your bank has a foreign affiliate. If it does, you may be able to withdraw funds from one of their ATMs once you arrive. If there are fees that you have to pay, it might be a good idea to take out as much money as you can at one time so that you don’t rack up fees for smaller withdrawals.

Another way to exchange currency is to purchase traveler’s checks. You can get travelers checks from most banks or credit unions. You may be able to buy them from your bank or credit union, but you’ll likely have to pay a small fee. Again, going into the bank and buying them from a teller is a good idea if you don’t want to pay extra to have them mailed to you.

If you can’t get traveler’s checks from your own bank, there may be another bank in your area that sells them, and your bank might even be able to give you a referral. Many traveler’s checks come from American Express. If you visit its website, you can enter your address and get a list of the closest banks that provide traveler’s checks. But the fee you’re required to pay may be higher if you don’t have an account with the bank.

The good thing about traveler’s checks is that you can easily order additional checks if you lose them or someone steals them. Plus, once you have them, you’re the only person who can trade those checks in for foreign currency. The downside is that not all businesses let you use them to make purchases. So you’ll probably have to find a bank once you get to your destination that cashes travelers checks.

An alternative is to find a prepaid travel credit card, like the ones offered by American Express and MasterCard. They offer some of the same benefits that traveler’s checks provide without the hassle of having to cash in the checks.

Opening a bank account in a foreign country might make sense if you frequently travel there, or especially if you own property in the country. If the bank sells currency, you could wait until you arrive to get the funds you need. Setting up an account may take time, so you’ll either need to do it in advance or open the account so you can access it later during your next trip.

Even if you don’t open a foreign bank account, these bank branches still might be able to exchange currency for you. If they are willing to do so you’ll likely have to pay a fee, just as you would in the U.S. if you aren’t a banking customer.

There are various online bureaus that sell foreign currency. But to get the most money at the cheapest rates, you’ll need to do some research. Travelmoneymax.com is just one website that makes it easy to compare different bureaus and find the ones with the best exchange rates. You may be able to avoid paying a shipping fee by ordering large amounts of currency at a single purchase.

Most popular JavaScript libraries are available from a public Content Delivery Network (CDN).

This can simplify deploying the application and keeping dependencies up to date. In fact, if you've followed any JavaScript tutorial for a library, then you've probably already used a public CDN but may not be aware of it.

A CDN is a Content Delivery Network. These are file hosting services for multiple versions of common libraries. They are usually highly performant and offer location cached files so no matter where your users are, they receive the files from geo locations close to them. This can make your application faster than hosting files yourself.

CDN's also have the advantage that if you are using libraries common to multiple sites then your users may already have the file cached in their browser. This speeds up your site because the browser doesn't need to download the library again.

For example, JQuery has an official JQuery CDN. If most JQuery applications import the JQuery library from this CDN, then users are more likely to have JQuery in their cache already.

Not every library has their own CDN. Most libraries deploy to npmjs.com and rely on the programmer adding the library to their project via npm at build time. npm downloads the library from a CDN and adds it to the project locally.

We don't have to be using npm and JavaScript build processes to take advantage of the npm eco-system. We can use an 'npm driven CDN' as the host for libraries, without having to use npm.

An 'npm-driven CDN' is one which hosts the distribution code for libraries which deploy to npm.

For example, AG Grid which I demonstrated in my article "How to Convert a Static HTML Table to a Dynamic JavaScript Data Grid" deploys to npm but does not have its own CDN. Instead, programmers can add a direct reference to AG Grid from a CDN like unpkg.com.

npm-driven CDNs monitor the releases distributed via npm, and host the releases on their own site.

In the source code for my earlier freeCodeCamp post, I used the unpkg.com CDN to import AG Grid in my code using a script element.

As with all code that we copy and paste, it's worth understanding what it does so that we can handle any issues.

I've only ever used three CDNs:

These are all professional and well-run sites. And the main reason I pick one above the other is that the tutorial I first followed for a library used that particular CDN in the code.

Knowing that multiple CDNs are available is useful because:

CDNs deliver more than JavaScript. For example, AG Grid deploys CSS files as well as JavaScript.

These would be referenced from the CDN as normal using link elements.

For example, AG Grid uses two style sheets.

The Structural Style sheet provides the CSS that will layout the data as a Grid.

The Theme Style sheet provides the visual aesthetics for the Grid.

Both of these CSS files are also deployed to npmjs.com and can be included into our project from a CDN.

In my open source table editing tool I use three libraries: AG Grid, PapaParse, and Faker.

Faker recently had an issue where a recent version deployed to npm had issues. So if my code had been defaulting to the latest version then my application would have failed.

Fortunately I had imported a specific version of faker from unpkg. As you can see from the src URL below I included version 5.5.3:

There are number of advantages to controlling the version:

I import the three libraries I use at specific versions:

This puts me in control of the testing and I'm more confident that any bugs in the application will be a result of my coding, rather than an update to a library used in the project.

The different CDNs may have a different syntax for controlling the version numbers. But you will be able to see the format to use by searching for the library on the CDN and following the documentation provided by each CDN.

Here are the listings for AG Grid on each of the CDN sites:

If you follow the links for the AG Grid packages then you will see that each site has a slightly different interface. But they all allow selecting a specific version of AG Grid and allow you to copy and paste the URL to add to your HTML file.

Below is a simple HTML file which will render a Data Grid on the screen.

I only have to deploy the HTML file, because the AG Grid library is loaded into the browser from the CDN.

In the example below I'm loading version 26.2.1 of AG Grid and the CSS files from the unpkg.com CDN.

Unpkg imports are demonstrated in this deployed html page.

I could easily use other CDNs by changing the script and link elements in the head section of my html file.

JSDelivr using version 26.2.1

JSDelivr imports are demonstrated in this deployed html page.

CdnJS using version 26.2.1. CdnJS takes a slightly different approach to version naming so it is worth checking the version drop down on the cdnJS AG Grid listing

CdnJS imports are demonstrated in this deployed html page.

We don't always have to deploy JavaScript libraries to our site along with our HTML files. Instead, we can include them such that they are delivered by a Content Delivery Network.

Many tutorials we follow will show examples of doing this.

If we do import JavaScript or CSS from a CDN we should add the version number of the library that we are using to protect our deployed example from future issues if the library updates.

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