I think,you should at first practice the basics of mnemonics and then,try to apply them in your programming language endeavor!! When you get the basics ingrained in your brain,the rest will be pretty easy!!!
You need to develop the ‘touchstone habits’ regarding ‘mnemonics’. Once you get used to the mnemonics techniques,you will be able to apply in everything in your life including programming languages(math or whatever)…
I personally just ‘convert the methods/functions/syntax’ of programming language(s) to concrete images,create stories with them,and put them in the Loci of my Memory Palaces,and review them time to time with ‘spaced repetition technique’.
I personally believe that ‘mnemonic’ techniques are very very helpful to learn ‘methods,functions,syntax’ of programming language!!
The way I apply or create a story with different images may not help you much,as images are basically individual thing! How you imagine something is gonna be very different than how I imagine…BUT the basics of Mnemonic techniques are always the same for all…
I suggest you to only choose the ways that are tested and proven to be effective…and as the saying in the world of programming goes, “Don’t reinvent the wheel”.
I mean,for example,Memory Palace is a technique that human being seems to be using since the dawn of time. So,this is a time tested technique. And you should use it…Another technique time tested is ‘linking method’…and so on!
The forum has a huge source>>> Links to Art of Memory Resources
Sorry,if I sound like I’m giving too many lectures 
Being a programmer myself, I thought,I should share my experiences so you don’t waste your precious time like I did, and you can apply the best and the most effective techniques in your memory journey…