bastman

/**
 * Filters the elements of this list to be instances of the specified type parameter [Child].
 */
public inline fun <reified T, reified Child : T> Iterable<T>.filterIsSubClassInstanceOf(): List<Child> {
    return this.filterIsInstance<Child>()
}

// usage example ...

sealed class S {

bastman

package com.example.demo

// based on ...
// https://www.reddit.com/r/Kotlin/comments/15b16px/little_example_of_railway_oriented_programming_in/
// https://github.com/GabrielLasso/Kotlin-railway-example

fun main() {
    val pipeline: (data: Either<Throwable, Person>) -> Either<Throwable, Response> =
        (::validate `→` ::save `→` ::notify `→` ::buildResponse)

bastman

/* 

InstantRangeDeserializer.kt

jackson-module-kotlin: InstantRangeDeserializer - How to deserialize ClosedRange<Instant>


Type definition error: [simple type, class kotlin.ranges.ClosedRange]; 
nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: 
Cannot construct instance of `kotlin.ranges.ClosedRange` (no Creators, like default constructor, exist): 

bastman

// see: https://itnext.io/sliding-window-algorithm-technique-6001d5fbe8b3
fun main() {
    intro()
    `Maximum sum subarray of Size k`()
    //`Count Occurrences of Anagram`()


}

fun intro() {

bastman

fun ObjectMapper.convertValueAsJsonNode(value:Any?):JsonNode = convertValue(value, JsonNode::class.java)

inline fun <reified T> JsonNode.jq(
    query: String,
    noinline convert: (Any) -> T
): T {
    val isNullable: Boolean = null is T
    try {
        val expression: Expression<JsonNode> = JmesPathJackson.compile(query)

bastman

// see discussion on alternatives here: https://discuss.kotlinlang.org/t/how-do-you-round-a-number-to-n-decimal-places/8843/15

fun Double.round(decimals:Int, roundingMode:RoundingMode=RoundingMode.HALF_EVEN):Double =
    toBigDecimal().setScale(decimals, roundingMode).toDouble()
    
# ???    
fun Double.round2(decimals: Int): Double {
    val locale:Locale = Locale.US
    val aTxt:String = String.format(locale, "%.${decimals+1}f", this)
    val aDouble:Double = aTxt.toDouble()

bastman

import com.fasterxml.jackson.databind.JsonNode
import com.fasterxml.jackson.databind.node.ArrayNode
import com.fasterxml.jackson.databind.node.JsonNodeFactory
import com.fasterxml.jackson.databind.node.ObjectNode
import io.burt.jmespath.Adapter
import io.burt.jmespath.JmesPath
import io.burt.jmespath.JmesPathType
import io.burt.jmespath.RuntimeConfiguration
import io.burt.jmespath.function.ArgumentConstraints
import io.burt.jmespath.function.BaseFunction

bastman

https://blog.timescale.com/tutorials/how-to-install-psql-on-mac-ubuntu-debian-windows/

bastman

SELECT my_id, COUNT(my_id) 
FROM my_table
GROUP BY my_id
HAVING COUNT(my_id) > 1;

bastman

$ kubectl create job --from=cronjob/<CRONJOB-NAME> <NEW-JOB-NAME>

e.g.:
$ kubectl create job --from=cronjob/my-cron my-cron-manual-001


function k8s-cronjob-run() {
  source_cronjob_name=$1
  [ -z "$source_cronjob_name" ] && echo "Please provide source-cronjob-name !" && return
  sink_run_id=$(date -u +"%Y-%m-%dt%H.%M.%Sz")