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Q&A Add single element for multiple keys to map

(merge m1 (zipmap ks (repeat itm))) Demonstration: $ clj Clojure 1.10.3 user=> (def m1 {:a 1 :b 2}) #'user/m1 user=> (def itm 3) #'user/itm user=> (def ks [:c :d :e]) #'user/ks u...

posted 2y ago by NoahTheDuke‭  ·  edited 2y ago by NoahTheDuke‭

Answer
#2: Post edited by user avatar NoahTheDuke‭ · 2021-11-16T15:42:24Z (over 2 years ago)
Add clj command and Clojure version to repl output
  • `(merge m1 (zipmap ks (repeat itm)))`
  • Demonstration:
  • ```clojure
  • user=> (def m1 {:a 1 :b 2})
  • #'user/m1
  • user=> (def itm 3)
  • #'user/itm
  • user=> (def ks [:c :d :e])
  • #'user/ks
  • user=> (merge m1 (zipmap ks (repeat itm)))
  • {:a 1, :b 2, :c 3, :d 3, :e 3}
  • ```
  • * [`repeat`](https://clojuredocs.org/clojure.core/repeat) returns a lazy sequence of the given item.
  • * [`zipmap`](https://clojuredocs.org/clojure.core/zipmap) returns a map with the first input (keys) mapped to the second input (vals), and it stops building the map when either input runs out of elements. In this case, it will be the given vector of keys.
  • * [`merge`](https://clojuredocs.org/clojure.core/merge) merges all of the input maps into a single map, left-to-right (so any repeated keys will overwrite previous keys).
  • `(merge m1 (zipmap ks (repeat itm)))`
  • Demonstration:
  • ```clojure
  • $ clj
  • Clojure 1.10.3
  • user=> (def m1 {:a 1 :b 2})
  • #'user/m1
  • user=> (def itm 3)
  • #'user/itm
  • user=> (def ks [:c :d :e])
  • #'user/ks
  • user=> (merge m1 (zipmap ks (repeat itm)))
  • {:a 1, :b 2, :c 3, :d 3, :e 3}
  • ```
  • * [`repeat`](https://clojuredocs.org/clojure.core/repeat) returns a lazy sequence of the given item.
  • * [`zipmap`](https://clojuredocs.org/clojure.core/zipmap) returns a map with the first input (keys) mapped to the second input (vals), and it stops building the map when either input runs out of elements. In this case, it will be the given vector of keys.
  • * [`merge`](https://clojuredocs.org/clojure.core/merge) merges all of the input maps into a single map, left-to-right (so any repeated keys will overwrite previous keys).
#1: Initial revision by user avatar NoahTheDuke‭ · 2021-11-16T15:41:34Z (over 2 years ago)
`(merge m1 (zipmap ks (repeat itm)))`

Demonstration:
```clojure
user=> (def m1 {:a 1 :b 2})
#'user/m1
user=> (def itm 3)
#'user/itm
user=> (def ks [:c :d :e])
#'user/ks
user=> (merge m1 (zipmap ks (repeat itm)))
{:a 1, :b 2, :c 3, :d 3, :e 3}
```

* [`repeat`](https://clojuredocs.org/clojure.core/repeat) returns a lazy sequence of the given item.
* [`zipmap`](https://clojuredocs.org/clojure.core/zipmap) returns a map with the first input (keys) mapped to the second input (vals), and it stops building the map when either input runs out of elements. In this case, it will be the given vector of keys.
* [`merge`](https://clojuredocs.org/clojure.core/merge) merges all of the input maps into a single map, left-to-right (so any repeated keys will overwrite previous keys).