1; Eclipse Public License, Version 1.0 (EPL-1.0) (plain text) THE ACCOMPANYING 2; PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC LICENSE 3; ("AGREEMENT"). ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM 4; CONSTITUTES RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT. 5; 6; 1. DEFINITIONS 7; 8; "Contribution" means: 9; 10; a) in the case of the initial Contributor, the initial code and 11; documentation distributed under this Agreement, and b) in the case of each 12; subsequent Contributor: i) changes to the Program, and ii) additions to the 13; Program; where such changes and/or additions to the Program originate from 14; and are distributed by that particular Contributor. 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No party to this 191; Agreement will bring a legal action under this Agreement more than one year 192; after the cause of action arose. Each party waives its rights to a jury 193; trial in any resulting litigation. 194 195(ns koans.23-meta 196 (:require [koan-engine.core :refer :all])) 197 198(def giants 199 (with-meta 'Giants 200 {:league "National League"})) 201 202(meditations 203 "Some objects can be tagged using the with-meta function" 204 (= __ (meta giants)) 205 206 "Or more succinctly with a reader macro" 207 (= __ (meta '^{:division "West"} Giants)) 208 209 "While others can't" 210 (= __ (try 211 (with-meta 212 2 213 {:prime true}) 214 (catch ClassCastException e 215 "This doesn't implement the IObj interface"))) 216 217 "Notice when metadata carries over" 218 (= __ (meta (merge '^{:foo :bar} {:a 1 :b 2} 219 {:b 3 :c 4}))) 220 221 "And when it doesn't" 222 (= __ (meta (merge {:a 1 :b 2} 223 '^{:foo :bar} {:b 3 :c 36rCRAZY}))) 224 225 "Metadata can be used as a type hint to avoid reflection during runtime" 226 (= __ (#(.charAt ^String % 0) "Cast me")) 227 228 "You can directly update an object's metadata" 229 (= 0xFF (let [giants 230 (with-meta 231 'Giants 232 {:world-series-titles (atom 7)})] 233 (swap! (:world-series-titles (meta giants)) __) 234 @(:world-series-titles (meta giants)))) 235 236 "You can also create a new object from another object with metadata" 237 (= {:league "National League" :park "AT&T Park"} 238 (meta (vary-meta giants 239 assoc __ __))) 240 241 "But it won't affect behavior like equality" 242 (= __ (vary-meta giants dissoc :league)) 243 244 "Or the object's printed representation" 245 (= __ (pr-str (vary-meta giants dissoc :league)))) 246