tudorels

Group array of JavaScript objects by keys

This fork of JamieMason's implementation changes the key parameter to be an array of keys instead of just a single key. This makes it possible to group by multiple properties instead of just one.

Implementation

const groupBy = keys => array =>
  array.reduce((objectsByKeyValue, obj) => {
    const value = keys.map(key => obj[key]).join('-');

Group Array of JavaScript Objects by Key or Property Value

Implementation

const groupBy = key => array =>
  array.reduce((objectsByKeyValue, obj) => {
    const value = obj[key];
    objectsByKeyValue[value] = (objectsByKeyValue[value] || []).concat(obj);
    return objectsByKeyValue;

	r.table("test").filter( function(doc) {
	return doc("adresses").contains(function(adress) {
	return adress("city").eq("Paris")
	})
	})



	/*
	{

	import Konva from 'konva';
	import { ShapeConfig } from 'konva/lib/Shape';

	export class HistoryStat {
	private static _instance: HistoryStat;
	public _currentStat: any[] = [];

	private _currentPointer: number = -1;
	private _history: Array<Object[]> = [];

	<template>
	<q-page class="flex flex-center">
	<div>
	<svg id="svg" width="300" height="300"></svg>
	</div>
	<svg width="0" height="0">
	<pattern
	id="pattern"
	patternUnits="userSpaceOnUse"
	x="0"

	package main

	import (
	"fmt"
	"net/http"
	"net/http/httputil"
	"net/url"

	"github.com/gin-gonic/gin"
	)

	package main

	import (
	"fmt"
	"log"
	"strings"

	"github.com/PuerkitoBio/goquery"
	)

	Section "Device"
	Identifier "Intel Graphics"
	Driver "intel"
	Option "TearFree" "true"
	Option "DRI" "3"
	Option "AccelMethod" "uxa"
	#Option "AccelMethod" "sna"
	EndSection

	DECLARE @Object AS INT;
	DECLARE @ResponseText AS VARCHAR(8000);
	DECLARE @Body AS VARCHAR(8000) =
	'{
	"what": 1,
	"ever": "you",
	"need": "to send as the body"
	}'

	EXEC sp_OACreate 'MSXML2.XMLHTTP', @Object OUT;

	<!DOCTYPE html>
	<html>
	<head>
	<title>Paste Image</title>
	<script type="text/javascript">
	var imageObj = new Image();
	window.onload = function() {
	document.getElementById("pasteTarget").
	addEventListener("paste", handlePaste);
	var canvas = document.getElementById('canvasTarget');