The environment variables DYLD_INSERT_LIBRARIES (macOS) and LD_PRELOAD (Linux) let you instruct the dynamic linker to load dynamic libraries that are not normally part of an application. Furthermore, the libraries specified are loaded before any other libraries.
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If you take a look at stock on Yahoo Finance during market hours, you will notice the price and other key information updates in realtime:
I was curious how this was done, so I started to investigate.
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A friend recently hired me to help build a small online store for him. He had three main requirements:
the store to be up and running ASAP; it had to be easy for him to manage; and it had to be built with JavaScript.
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