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shankarshastri / gist:4d496958d7d0b06f568ee043f2637ab4
Created Jan 2, 2020 — forked from cvogt/gist:9193220
Slick: Dynamic query conditions using the **MaybeFilter** (Updated to support nullable columns)
View gist:4d496958d7d0b06f568ee043f2637ab4
import scala.slick.lifted.CanBeQueryCondition
// optionally filter on a column with a supplied predicate
case class MaybeFilter[X, Y](val query: scala.slick.lifted.Query[X, Y]) {
def filter[T,R:CanBeQueryCondition](data: Option[T])(f: T => X => R) = {
data.map(v => MaybeFilter(query.filter(f(v)))).getOrElse(this)
}
}
// example use case
import java.sql.Date
View Applied-FP-with-Scala.md

Applied Functional Programming with Scala - Notes

Copyright © 2016-2018 Fantasyland Institute of Learning. All rights reserved.

1. Mastering Functions

A function is a mapping from one set, called a domain, to another set, called the codomain. A function associates every element in the domain with exactly one element in the codomain. In Scala, both domain and codomain are types.

val square : Int => Int = x => x * x
@shankarshastri
shankarshastri / redis-master.yaml
Last active Jan 29, 2020
Redis And Redis Insight
View redis-master.yaml
apiVersion: v1
kind: Service
metadata:
name: redis-service
spec:
type: LoadBalancer
selector:
app: redis
ports:
- name: redis
@shankarshastri
shankarshastri / LearnXInYMinProtocolBuffer.proto
Last active Feb 26, 2020
Self-Explanatory Protocol Buffer Lang Guide (CheatSheet)
View LearnXInYMinProtocolBuffer.proto
/*
* Self-Explanatory Protocol Buffer Lang Guide
*/
/*
* Why Protocol Buffers?
* Protocol buffers are Google's language-neutral, platform-neutral, extensible mechanism for serializing structured data – think XML, but smaller, faster, and simpler.
* You define how you want your data to be structured once, then you can use special generated source code to easily write and read your structured data to and from a variety of data streams and using a variety of languages.
* Protocol Buffers are Schema Of Messages. They are language agnostic.
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