爲什麼在一個賬號之後減少停止？

Question

我編寫gen-sim-map函數的方式有些不對。它會在一個帳號後停止，並在向量中最後一個數字。我想知道我做錯了什麼。我可以通過對該函數應用重複來解決問題，但這對我來說似乎是錯誤的。

這裏是數據和調用;函數defs在下面。

(def acct-nums (gen-acct-nums 5)) 
#'ba1-app/acct-nums 

ba1-app=> acct-nums 
[10000 10001 10002 10003 10004 10005] 

ba1-app=> (gen-sim-map acct-nums) 
{10005 [\W 160.12]} 

(defn random-trans 
    [] 
    (nth avail-trans (.nextInt random (count avail-trans)))) 

(defn random-amount 
    [] 
    (float (/ (.nextInt random (count (range 1 10000))) 25))) 

; Generate an account number. The range is arbitrary to make it look a real bank account #. 
(defn gen-acct-nums [range-end-idx] 
    (vec (range 10000 (+ 10000 range-end-idx 1)))) 

(defn gen-sim-map [acct-nums] 
    (reduce 
     (fn [sim-map one-acct-num] 
      (let [trans (random-trans) 
        amt (random-amount)] 
       { one-acct-num (vector trans amt) })) 
     {} 
     acct-nums)) 

Answer 1

我懷疑你的問題是你沒有改變累加器。我期望看到像

(defn gen-sim-map [acct-nums] 
    (reduce 
     (fn [sim-map one-acct-num] 
      (let [trans (random-trans) 
       amt (random-amount)] 
       (assoc sim-map one-acct-num (vector trans amt)))) ; <--- 
     {} 
     acct-nums)) 

或類似。