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(ns aula9.exercicio | |
(:require [aula9.dados-banco :as data])) | |
;; 1 crie um átomo com o vetor dados banco. | |
(def clients-map | |
(atom | |
(reduce | |
(fn [acc item] | |
(assoc acc (:id item) item)) {} data/banco-db))) | |
(def clients (atom data/banco-db)) | |
;; 2 crie uma função capaz de trazer um cliente de acordo com o seu id | |
(defn get-client-by-id-map | |
[clients id] | |
(get clients id)) | |
(defn get-client-by-id | |
[clients client-id] | |
(first | |
(filter | |
(fn [{:keys [id]}] (= client-id id)) | |
clients))) | |
(comment | |
(get-client-by-id-map @clients-map 2) | |
(get-client-by-id @clients 2) | |
(get-client-by-id-map @clients-map 100) | |
(get-client-by-id @clients 100) | |
) | |
;; 3 crie uma função que, dado um valor adiciona esse valor do saldo existente de um cliente dado id. A função deve printar o valor anterior do saldo | |
(defn add-new-value-map | |
[id new-value] | |
(let [old-client (get-client-by-id-map @clients-map id)] | |
(println old-client) | |
(swap! | |
clients-map | |
(fn [clients] | |
(update-in | |
clients | |
[id :saldo] | |
#(+ % new-value)))))) | |
(defn add-new-value | |
[id new-value] | |
(let [old-client (get-client-by-id @clients id) | |
old-client-index (.indexOf @clients old-client)] | |
(println old-client) | |
(swap! | |
clients | |
(fn [clients] | |
(update-in | |
clients | |
[old-client-index :saldo] | |
#(+ % new-value)))))) | |
(comment | |
(add-new-value-map 2 100) | |
(add-new-value 2 100) | |
) | |
;; 4 crie uma função que, dado um valor subtrai esse valor do saldo existente de um cliente dado id. A função deve printar o valor anterior do saldo | |
(comment | |
(add-new-value-map 2 -100) | |
(add-new-value 2 -100) | |
) | |
;; 5 crie uma função chamada 'transação' da qual você passa uma das operações (deposito/saque), o valor a ser depositado/retirado e efetua uma transação bancária. | |
(defn transacao-map | |
[operation value id] | |
(cond | |
(= operation :deposito) (add-new-value-map id value) | |
(= operation :saque) (add-new-value-map id (- value)))) | |
(defn transacao | |
[operation value id] | |
(cond | |
(= operation :deposito) (add-new-value id value) | |
(= operation :saque) (add-new-value id (- value)))) | |
(comment | |
(transacao-map :deposito 100 2) | |
(transacao-map :saque 100 2) | |
(transacao :deposito 100 2) | |
(transacao :saque 100 2) | |
) |
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