Maximilian Rauh maxrawlinger

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Array Iteration

https://gist.github.com/ljharb/58faf1cfcb4e6808f74aae4ef7944cff

While attempting to explain JavaScript's reduce method on arrays, conceptually, I came up with the following - hopefully it's helpful; happy to tweak it if anyone has suggestions.

Intro

JavaScript Arrays have lots of built in methods on their prototype. Some of them mutate - ie, they change the underlying array in-place. Luckily, most of them do not - they instead return an entirely distinct array. Since arrays are conceptually a contiguous list of items, it helps code clarity and maintainability a lot to be able to operate on them in a "functional" way. (I'll also insist on referring to an array as a "list" - although in some languages, List is a native data type, in JS and this post, I'm referring to the concept. Everywhere I use the word "list" you can assume I'm talking about a JS Array) This means, to perform a single operation on the list as a whole ("atomically"), and to return a new list - thus making it mu

TypeScript and currying

In functional programming you often want to apply a function partly. A simple example is a function add. It would be nice if we could use add like:

var res2 = add(1, 3); // => 4

var add10To = add(10);
var res = add10To(5); // => 15

	import merge from "lodash/merge"
	import * as z from "zod"

	const recursiveError = (arr: Array<string \| number>, lastError: string[] \| object): any => {
	if (!arr \|\| arr.length === 0) {
	return lastError
	}
	const [currPath, ...iss] = arr
	let newErr
	if (typeof currPath === "string") {

	const highlight = (fuseSearchResult: any, highlightClassName: string = 'highlight') => {
	const set = (obj: object, path: string, value: any) => {
	const pathValue = path.split('.');
	let i;

	for (i = 0; i < pathValue.length - 1; i++) {
	obj = obj[pathValue[i]];
	}

	obj[pathValue[i]] = value;

	import React from 'react';
	import PropTypes from 'prop-types';
	import moment from 'moment';
	import { connect } from 'react-redux';

	import * as actions from 'actions/cards';
	import { activateCardStep1Validate, activateCardStep2Validate } from 'utils/validate';
	import { API_BIRTHDATE_FORMAT } from 'utils/constants';
	import Modal, { ModalContent } from 'components/Modal';
	import Wizard from 'components/Wizard';

	Iteration(s): 0
	==================================
	Object.create: 0
	Object.setPrototypeOf: 0

	Iteration(s): 1
	==================================
	Object.create: 0
	Object.setPrototypeOf: 0.04

	# force HTTPS and www.
	RewriteEngine On
	RewriteCond %{HTTP_HOST} (?!^www\.)^(.+)$ [OR]
	RewriteCond %{HTTPS} off
	RewriteRule ^ https://www.%1%{REQUEST_URI} [R=301,L]


	# alternative way
	RewriteCond %{HTTP_HOST} !^$
	RewriteCond %{HTTP_HOST} !^www\. [NC]

	var a = 123, b = 'hello';
	function test(x, y) {
	console.log(this);
	return a + x + b + y;
	}

	// Serialize a function with its captured environment
	var sf = serialize(test, { a: a, b: b });

	// Deserialize with captured environment