markus2610

Lerp in Jetpack Compose: The Tiny Function Behind Smooth Animations

What is lerp?

Linear interpolation. Given a start, an end, and a fraction t ∈ [0,1], lerp returns a value in between:

lerp(a, b, t) = a + (b - a) * t

• t = 0 ➜ start
• t = 1 ➜ end

markus2610

import androidx.compose.ui.tooling.preview.PreviewParameterProvider
import kotlin.reflect.KClass

/**
 * Creates a [PreviewParameterProvider] based on the classes of two existing providers.
 *
 * You can create your own easily with Kotlin delegation:
 * ```
 * class ExampleProvider : PreviewParameterProvider<Pair<Type1, Type2>> 
 *    by compositeProvider(Type1ParameterProvider::class, Type2ParameterProvider::class)

markus2610

// NOTE: This code uses Compose 1.0.0-beta09

import androidx.compose.foundation.Canvas
import androidx.compose.foundation.layout.BoxWithConstraints
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue

markus2610

/**
 * Returns a [State] holding a local animation time in milliseconds.
 * The value always starts at `0L` and stops updating when
 * the call leaves the composition.
 */
@Composable
fun animationTimeMillis(): State<Long> {
    val millisState = state { 0L }
    val lifecycleOwner = LifecycleOwnerAmbient.current
    launchInComposition {

markus2610

# example color list:
c = """#e41a1c
#377eb8
#4daf4a
#984ea3
#ff7f00
#ffff33
#a65628
#f781bf
#999999"""

markus2610

import { HttpEvent, HttpHandler, HttpInterceptor, HttpRequest, HttpResponse } from '@angular/common/http';
import { Observable } from 'rxjs/Observable';
import { map } from 'rxjs/operators';
import * as CryptoJS from 'crypto-js';

export class RequestInterceptor implements HttpInterceptor {  
  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    // Encrypt the body.
    
    const updatedReq = req.clone({

markus2610

Charles command-line options

Charles supports a few command line options out of the box, documented here.
Unfortunately they seem to operate only as parameters for new Charles sessions, so you won't be able to run commands on a running instance of Charles.

Start a specific Charles session

A Charles session contains all of your recorded information. It is represented by the Session window; by default a new session is automatically created when you start Charles.
Sessions can be saved from File → Save Session (⌘+S).
Once saved, if you want you can start Charles from the saved session by running:

markus2610

Data Modeling with MongoDB

---

Objectives

• Understand model relationships in MongoDB
• Understand One-to-Many relationships

markus2610

# See list of docker virtual machines on the local box
$ docker-machine ls
NAME      ACTIVE   URL          STATE     URL                         SWARM   DOCKER   ERRORS
default   *        virtualbox   Running   tcp://192.168.99.100:2376           v1.9.1 

# Note the host URL 192.168.99.100 - it will be used later!

# Build an image from current folder under given image name
$ docker build -t gleb/demo-app .

markus2610

const fs = require('fs');
const yargs = require('yargs');

const { Argv } = yargs;
const { promisify } = require('util');
const { resolve } = require('path');

const exists = promisify(fs.exists);
const readFile = promisify(fs.readFile);
const writeFile = promisify(fs.writeFile);