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Task/Associative-array-Creation/EchoLisp/associative-array-creation.echolisp

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+(lib 'hash) ;; needs hash.lib
+(define H (make-hash)) ;; new hash table
+;; keys may be symbols, numbers, strings ..
+;; values may be any lisp object
+(hash-set H 'simon 'antoniette)
+   → antoniette
+(hash-set H 'antoinette 'albert)
+   → albert
+(hash-set H "Elvis" 42)
+    → 42
+(hash-ref H 'Elvis)
+    → #f ;; not found. Elvis is not "Elvis"
+(hash-ref H "Elvis")
+    → 42
+(hash-ref H 'simon)
+    → antoniette
+(hash-count H)
+    → 3