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https://leetcode.com/problems/merge-strings-alternately/editorial/?source=submission-ac In swift, you cannot access characters by someString[3] It’s a big song and dance with getting a string index from the startIndex Once you have the start index,...
Things I learnt: When there is mapping to be done, think about a DICTIONARY Here, we have to use the VALUES of the array, e.g. [1, 2, 3, 4] Figure out which numbers add up to 6 = 2 + 4 But we want to output the INDEX of the array So we need to m...
If you are in the middle of having Swift five and six in your code base, then you will need to proactively deal with applying the main actor attribute to your Swift five code, so that it doesn't break when you upgrade to Swift six. This can happen if...
Design a reservation and payment system for a parking garage https://www.youtube.com/watch?v=NtMvNh0WFVM&list=PLrtCHHeadkHp92TyPt1Fj452_VGLipJnL I’m up to 4m01s Step 1: define the scope Clarifying questions I came up with <what do I call this catego...
Thoughts on what to discuss at each stage Step 1: narrow the scope Scale: how many users / traffic Security / Authentication: is this already in place? Data size: e.g. handling videos is different to images vs small data like credit card transacti...
Normalized databases: Definition The “purest” form of a database, where all databases are scoped to be as small as possible The database can contain FK indexes to allow for joining to other DBs e.g. Reports Table, which has columns for: report id ...
Function invocation id scoped for the webjob execution `Properties.MS_FunctionInvocationId` Operation id scoped for the lifetime of the http request
Lazy loading virtual properties are only loaded when they are required to be used This is controlled by an option that you set - you can make lazy loading the default way to load properties Has an N+1 loading problem. If you have a foreach stateme...
Read through When you read something, it checks the cache to see if it is there If it's not in the cache, it will put it in the cache This means data will always exist in the cache, unless the data doesn't exist Write through When you write to...