Dart\u306b\u306f\u30d5\u30a1\u30fc\u30b9\u30c8\u30af\u30e9\u30b9\u306eFunction\u304c\u3042\u308a\u307e\u3059\u3002
\n
\n\u7c21\u5358\u306a\u4f8b\u3092\u307f\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u30af\u30ed\u30fc\u30b8\u30e3\u306e\u4f8b\u3092\u3042\u3052\u3066\u3044\u307e\u3059\u3002f\u306fx+n\u3092\u8fd4\u3059\u95a2\u6570\u3092\u4f5c\u308a\u3060\u3057\u307e\u3059\u3002f(2)\u3068\u547c\u3076\u3068\u3001\u300c(x)=>x+2\u300d\u306e\u95a2\u6570\u3092\u4f5c\u308a\u307e\u3059\u3002g\u306f\u5408\u6210\u95a2\u6570\u3092\u4f5c\u3063\u3066\u3044\u307e\u3059\u3002f(Math.sin)\u3068\u547c\u3076\u3068\u3001\u300c(x,y)=>Math.sin(x)*y\u300d\u3068\u3044\u3046\u95a2\u6570\u3092\u4f5c\u308a\u307e\u3059\u3002\u3053\u3046\u3044\u3063\u305f\u51e6\u7406\u3092\u5408\u6210\u3059\u308b\u3053\u3068\u304c\u8a00\u8a9e\u6a5f\u80fd\u3068\u3057\u3066\u7c21\u5358\u306b\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u308b\u3068\u3053\u308d\u304c\u3046\u308c\u3057\u3044\u3067\u3059\u306d\u3002<\/p>\n
\r\nFunction f(num n) {\r\n return (x) => x + n;\r\n}\r\nFunction g(Function _f) {\r\n return (num x, [num y=1]) => _f(x) * y;\r\n}\r\nmain() {\r\n int n = 2;\r\n var f0 = f(n);\r\n print(f0(1)); \/\/ 3\r\n n = 3;\r\n var f1 = f(n);\r\n print(f0(1)); \/\/ 3\r\n print(f1(1)); \/\/ 4\r\n\r\n print("----------");\r\n var g0 = g(f0);\r\n for(num x=0; x<5; x+=1) {\r\n print(g0(x)); \r\n }\r\n print("----------");\r\n var g1 = g(f1);\r\n for(num y=0; y<5; y+=1) {\r\n print(g1(2, y)); \r\n }\r\n}\r\n<\/pre>\n\u4f8b\u3067\u306f\u3001f(n)\u306e\u3088\u3046\u306b\u5909\u6570\u3092\u6e21\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u3053\u306e\u4f8b\u3067\u306ff(2)\u306e\u3088\u3046\u306b\u3057\u3066\u3082\u540c\u3058\u3067\u3059\u3002\u300cf0=f(n);\u300d\u3068\u3057\u3066\u304b\u3089n\u306e\u5024\u3092\u5909\u66f4\u3057\u3066\u3082\u3001f0\u306b\u306f\u5f71\u97ff\u304c\u3042\u308a\u307e\u305b\u3093\u3002f0\u306e\u4e2d\u3067\u4f7f\u308f\u308c\u3066\u3044\u308b\u5909\u6570n\u306f\u300cf0=f(n);\u300d\u3068\u3057\u305f\u6642\u70b9\u3067\u30ad\u30e3\u30d7\u30c1\u30e3\u3055\u308c\u3066f0\u3068\u3044\u3046\u95a2\u6570\u3068\u7d50\u3073\u3064\u3044\u3066\u7528\u610f\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u5b9f\u884c\u7d50\u679c\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u300cg0(x)\u300d\u306fx\u306b2\u3092\u8db3\u3057\u305f\u5024\u306b\u306a\u308a\u307e\u3059\u3057\u3001\u300cg1(2, y)\u300d\u306ff1(2)*y\u3064\u307e\u308a5*y\u306e\u5024\u306b\u306a\u308a\u307e\u3059\u304b\u3089\u3001\u305d\u306e\u3053\u3068\u3092\u7406\u89e3\u3057\u3066\u7d50\u679c\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\r\n3\r\n3\r\n4\r\n----------\r\n2\r\n3\r\n4\r\n5\r\n6\r\n----------\r\n0\r\n5\r\n10\r\n15\r\n20\r\n<\/pre>\n\u30af\u30ed\u30fc\u30b8\u30e3\u306f\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u306e\u4ed5\u7d44\u307f\u3092\u63d0\u4f9b\u3057\u305f\u308a\u5229\u7528\u3057\u305f\u308a\u3059\u308b\u3068\u304d\u306b\u4fbf\u5229\u3067\u3059\u304b\u3089\u3001\u899a\u3048\u3066\u304a\u304d\u305f\u3044\u30c6\u30af\u30cb\u30c3\u30af\u3067\u3059\u3002<\/p>\n