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How to iterate a range of numbers in Clojure?


How to iterate a range of numbers in Clojure?

By : communicab
Date : November 21 2020, 07:31 AM
wish help you to fix your issue In Clojure, there's really no universal answer to this as it's decided by why you want to iterate through those numbers.
You might want to produce some value for each of the numbers and then collect them in a list, in which case you want to use map or for. You might want to "summarize" them in some way (like adding them all together) in which case you'd want to use something like reduce.
code :
(defn why-not-prime [n]
  (let[checker (fn [divisor] ;; A local function under the name checker, with one argument
                 (if (= 0 (mod n divisor));; If that argument is a divisor of n
                   divisor ;;then return it
                   false)) ;; otherwise return false - this value wasn't "appropriate"
       witness (some checker (range 2 n))] ;; witness will be the first value that satisfies checker
              ;if there isn't such a value, witness is nil
    (if witness
      (str n " is composite because it can be divided by " witness)
      (str n " is prime."))))


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Clojure (range) and (iterate inc 0) difference on def -light table

Clojure (range) and (iterate inc 0) difference on def -light table


By : user6417119
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Chris Granger, the LightTable developer Added an issue:
https://github.com/Kodowa/Light-Table-Playground/issues/657
Why does Clojure's range iterate only 32 times?

Why does Clojure's range iterate only 32 times?


By : DisplayName=
Date : March 29 2020, 07:55 AM
I wish this helpful for you for evaluates to a lazy sequence. Due to something called chunking, you are getting lucky here and for is being chunked into 32-element lazy partitions.
The code in your question is extremely non-idiomatic.
code :
(doseq [i (range 100)]
  (println i))

;; or

(dotimes [i 100]
  (println i))
List Prime Numbers within a range results in an error message in Clojure

List Prime Numbers within a range results in an error message in Clojure


By : user2288281
Date : March 29 2020, 07:55 AM
this one helps. In clojure the result of a function is its last expression, so in your example (if (= n 1) false) and (if (= n 2) no-divisors?) are always lost, because the last expression is (no-divisors? n).
Try this:
code :
(defn is-prime? [n]
    (cond 
       (= n 1) false
       (= n 2) true
       :else (no-divisors? n)))
MySQL CTE - is it possible to iterate over range of numbers?

MySQL CTE - is it possible to iterate over range of numbers?


By : user3328698
Date : March 29 2020, 07:55 AM
it fixes the issue I'm curious if is that possible to do similar query using CTE (the values of "id" may vary, not necessarily in succession)
code :
with my_table_numbered as (
  select ((row_number() over ())-1)%3 as rn_mod, id from my_table
)
select elt(rn_mod+1, 5, 10, 22, 33) as val, id 
from my_table_numbered;
+------+----+
| val  | id |
+------+----+
| 5    |  1 |
| 10   |  2 |
| 22   |  3 |
| 5    |  4 |
| 10   |  6 |
| 22   |  7 |
| 5    |  8 |
| 10   |  9 |
| 22   | 13 |
| 5    | 14 |
| 10   | 15 |
| 22   | 16 |
+------+----+
iterate through range of numbers to add as keys

iterate through range of numbers to add as keys


By : Erick Lawiet
Date : October 22 2020, 11:12 PM
Hope that helps Try array_fill_keys and range
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