Clojure - Function that returns all integers up to a certain number

Question

I want to create a function that when you input a number say 5 it'll return a vector of all numbers from 1 to 5, ie [1 2 3 4 5]

So far I am at

    (defn counter [number]
      (let [x 1
            result []]
       (when (<= x number)
        (conj result x)
        (inc x))))

Right now it'll put 1 into the vector but I want to say now (inc x) and run through again. Do I have to use recur?

Any help is much appreciated

Answer 1

There is a builtin function range. To achieve your goal (vector of numbers from 1 to n inclusively) you can wrap it as follows:

(defn get-range [n]
  (->> n inc (range 1) vec))

(get-range 5)
#=> [1 2 3 4 5]

Also, you can go and use iterate function

(defn get-range [n]
  (->> (iterate inc 1)
       (take n)
       vec))

Or use a loop:

(defn get-range [n]
  (loop [m 1
         res []]
    (if (> m n)
      res
      (recur (inc m) (conj res m)))))