Dinh Thoai Tran

• First 10 items

1)
+ What is the effect of extern "C" in C++?
o extern-_c_-c 2)
+ Find object by id in an array of JavaScript objects
o object-array-javascript-objects 3)
+ Does Java support default parameter values?
o java-support-default-parameter-values 4)
+ Preview an image before it is uploaded
o preview-image-uploaded 5)
+ How to convert int to string in C++?
o convert-int-string-c 6)
+ Comments in Markdown
o comments-markdown 7)
+ How to replace master branch in Git, entirely, from another branch?
o replace-master-branch-git_-entirely_-bra-209be0a079e84a36f746d108bc6021c1 8)
+ How do I commit case-sensitive only filename changes in Git?
o commit-case-sensitive-filename-git 9)
+ How do I check if a variable is an array in JavaScript?
o check-variable-array-javascript 10)
+ How do I exclude a directory when using `find`?
o exclude-directory-_find

On initial steps of developing web product, I don't know if product's idea is accepted by users or not. With my past experience, on these steps, saving money as much as possible but on order hand being ready to pay for better service with less effort in changing code base. I choose following hosting solution:

• Front Gateway:

  o The web which user access directly (or front-end)

  o I use free hosting of InfinityFree.com . Free account has some technical limitation but provider provides premium package for $7 / month. The limitation of free account is bandwidth, JavaScript injection. So I make a util functions to get web results from back-end. When I move to later steps, I can buy premium account, then change util functions only, and the site will run faster without any limitation any more.

• Bridge:

  o HTTP tunel which help I publish back-end website to Internet from Android device on local network

  o I use free account of Pinggy.io. Free account has limitation of non-continuous connection but provider provide premium package to remove limitation.

• Back End:

  o The web provide API to access database

  o I use my free Android device to host this back-end. Because I don't use 3G/4G/5G, so

  _ In USA, I buy smartphone from network provider, remove SIM card and use Wi-Fi only. It is very cheap, only ~ $35 - $45 with (3GB - 4GB RAM phone)

  _ In Vietnam, the smartphone is much expensive but it is around $110 for (6GB RAM phone)

I run more than one business, and for a long time I could not have told you, with a straight face, exactly which one was profitable in a given month. I had a general feeling, but no real number I trusted, just totals across bank accounts that never told the full story.

If you are running two or more businesses right now, do you actually know this month's numbers by business, or are you working off a general feeling too? What made you either build a real system for it, or decide it was not worth the effort yet?