# Advent of Code 2019-08 with R & JavaScript

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Solving Advent of Code 2019-08 with R and JavaScript.

[Disclaimer] Obviously, this post contains a big spoiler about Advent

of Code, as it gives solutions for solving day 8.

## About the JavaScript code

The JavaScript code has been written in the same RMarkdown as the R

code. It runs thanks to the `{bubble}`

package:

https://github.com/ColinFay/bubble

## Instructions

Find the instructions at: https://adventofcode.com/2019/day/8

## R solution

### Part one

library(magrittr) library(purrr) ipt <- read.delim("input8.txt", header = FALSE, colClasses = "character")$V1 ipt <- strsplit(ipt, "")[[1]] %>% as.numeric() layers_size <- 6 * 25 l <- list() for (i in 1: (length(ipt)/layers_size)){ l[[i]] <- ipt[1:150] ipt <- ipt[151:length(ipt)] } mn <- l %>% lapply(table) %>% map_dbl("0") %>% which.min() l[[mn]] %>% table() ## . ## 0 1 2 ## 7 14 129 14 * 129 ## [1] 1806

### Part two

v <- c() for (i in seq_len(layers_size)){ idx <- map_dbl(l, i) v[i] <- idx[idx %in% c(0,1)][1] } library(dplyr) library(tidyr) library(ggplot2) library(tibble) matrix(v, ncol = 6) %>% as.data.frame() %>% rowid_to_column() %>% gather(key = key, value = value, V1:V6) %>% mutate(key = gsub("V(.)", "\\1", key) %>% as.numeric()) %>% ggplot(aes(rowid, key, fill = as.factor(value))) + geom_tile() + coord_fixed() + scale_fill_viridis_d() + scale_y_reverse()

## JS solution

var ipt = fs.readFileSync("input8.txt", 'utf8').split("").filter(x => x.length != 0 & x != '\n').map(x => parseInt(x)); var layers_size = 6 * 25; var layer_n = ipt.length / layers_size; var res = []; function table(vec){ var tbl = {}; vec.map(function(x){ if (tbl[x]){ tbl[x] = tbl[x] + 1; } else { tbl[x] = 1; } }) return tbl; } for (var i = 0; i < layer_n; i ++){ res[i] = ipt.splice(0, layers_size); } var res_b = res.map(x => table(x)); var minim = Math.min.apply(Math, res_b.map(x => x['0'])); var smallest = res_b.filter(x => x['0'] == minim); smallest[0]["1"] * smallest[0]["2"]; ## 1806 var v = []; for (var i = 0; i < layers_size; i ++){ var idx = res.map(x => x[i]); v[i] = idx.find(z => z== 0 | z == 1); } var nn = []; for (var i = 0; i < 6; i ++){ nn[i] = v.splice(0, 25).join(" ").replace(/0/g, " "); } nn ## [ ' 1 1 1 1 1 1 1 1 1 1 1 1 1 ', ## ' 1 1 1 1 1 1 1 1 ', ## ' 1 1 1 1 1 1 1 1 1 1 ', ## ' 1 1 1 1 1 1 1 1 1 1 1 1 1 ', ## '1 1 1 1 1 1 1 1 1 ', ## ' 1 1 1 1 1 1 1 1 1 ' ]

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