{"id":280,"date":"2022-05-25T04:51:55","date_gmt":"2022-05-24T19:51:55","guid":{"rendered":"https:\/\/www.kd2.jp\/memo3\/?p=280"},"modified":"2022-06-08T11:08:01","modified_gmt":"2022-06-08T02:08:01","slug":"%e9%85%8d%e5%88%97%e3%81%ae%e5%90%88%e8%a8%88%e3%82%92%e6%b1%82%e3%82%81%e3%82%8b","status":"publish","type":"post","link":"https:\/\/www.kd2.jp\/memo3\/?p=280","title":{"rendered":"\u914d\u5217\u306e\u5408\u8a08\u3092\u6c42\u3081\u308b"},"content":{"rendered":"

\u4ee5\u4e0b\u306e\u914d\u5217\u306e\u548c\u3092\u6c42\u3081\u308b\u3002<\/p>\n

\n
array1 = [1,2,3,4,5]<\/pre>\n<\/div>\n
slice\u95a2\u6570 : \u914d\u5217\u306e\u4e00\u90e8\u3092\u30b3\u30d4\u30fc\u3057\u3066\u8fd4\u3059\u3002<\/p>\n
\n
\/\/ 1\u756a\u76ee\u304b\u30895\u500b\u306e\u8981\u7d20\u3092\u30b3\u30d4\u30fc\u3057\u3066\u8fd4\u3059\u3002\r\nconsole.log(array1.slice(0, 5)) \/\/ [ 1, 2, 3, 4, 5 ] \r\n\/\/ 2\u756a\u76ee\u4ee5\u964d\u306e\u8981\u7d20\u3092\u30b3\u30d4\u30fc\u3057\u3066\u8fd4\u3059\u3002\r\nconsole.log(array1.slice(1)) \/\/ [ 2, 3, 4, 5]\r\n\/\/ 3\u756a\u76ee\u4ee5\u964d\u306e\u8981\u7d20\u3092\u30b3\u30d4\u30fc\u3057\u3066\u8fd4\u3059\u3002 \r\nconsole.log(array1.slice(2)) \/\/ [ 3, 4, 5]\r\n\/\/ \u53f3\u304b\u30891\u500b\u306e\u8981\u7d20\u3092\u8fd4\u3059\u3002 \r\nconsole.log(array1.slice(-1)) \/\/ [ 5 ]\r\n\/\/ \u53f3\u304b\u30892\u500b\u307e\u3067\u306e\u8981\u7d20\u3092\u8fd4\u3059\u3002 \r\nconsole.log(array1.slice(-2)) \/\/ [4, 5] \r\n\r\n\/\/ slice\u3092\u4f7f\u7528\u3057\u3066\u914d\u5217\u306e\u548c\u3092\u6c42\u3081\u308b\u3002\r\n\/\/ \u518d\u5e30\u3067slice\u3092\u547c\u3073\u51fa\u3057\u3066\u30011\u756a\u76ee\u306e\u5024\u30926\u56de\u8db3\u3057\u3066\u3044\u304f(\u305f\u3060\u3057\u30016\u56de\u76ee\u306e\u5024\u306f0)\u3002\r\nconst gokei1 = (arr) => (arr.length === 0 ? 0 : arr[0] + gokei1(arr.slice(1))) \r\nconsole.log(gokei1(array1)) \/\/ 15<\/pre>\n<\/div>\n
\u6b8b\u4f59\u5f15\u6570 (Rest Parameters)<\/p>\n
\n
\/\/ \u6b8b\u4f59\u5f15\u6570\u3060\u3051\u3092\u6307\u5b9a\u3059\u308b\u3068\u3001\u6b8b\u4f59\u5f15\u6570\u306b\u914d\u5217\u5168\u4f53\u306e\u8981\u7d20\u304c\u30b3\u30d4\u30fc\u3055\u308c\u308b\u3002\r\nconst zanyo0 = ([...nokori]) => (nokori) \r\nconsole.log(zanyo0(array1)) \/\/ [ 1, 2, 3, 4, 5 ] \r\n\/\/ \u7b2c\u4e00\u5f15\u6570\u3068\u6b8b\u4f59\u5f15\u6570\u3092\u6307\u5b9a\u3059\u308b\u3068\u3001\u6b8b\u4f59\u5f15\u6570\u306b2\u756a\u76ee\u4ee5\u964d\u306e\u914d\u5217\u8981\u7d20\u304c\u30b3\u30d4\u30fc\u3055\u308c\u308b\u3002\r\nconst zanyo1 = ([first, ...nokori]) => (nokori) \r\nconsole.log(zanyo1(array1)) \/\/ [ 2, 3, 4, 5 ] \r\n\/\/ \u7b2c\u4e00\u5f15\u6570\u3068\u7b2c\u4e8c\u5f15\u6570\u3068\u6b8b\u4f59\u5f15\u6570\u3092\u6307\u5b9a\u3059\u308b\u3068\u3001\u6b8b\u4f59\u5f15\u6570\u306b3\u756a\u76ee\u4ee5\u964d\u306e\u914d\u5217\u8981\u7d20\u304c\u30b3\u30d4\u30fc\u3055\u308c\u308b\u3002\r\nconst zanyo2 = ([first, second, ...nokori]) => (nokori) \r\nconsole.log(zanyo2(array1)) \/\/ [ 3, 4, 5 ] \r\n\r\n\/\/ \u6b8b\u4f59\u5f15\u6570\u3092\u4f7f\u7528\u3057\u3066\u914d\u5217\u306e\u548c\u3092\u6c42\u3081\u308b\u3002 \r\n\/\/ \u518d\u8d77\u306b\u6b8b\u4f59\u5f15\u6570\u3092\u6e21\u3057\u3066\u30011\u756a\u76ee\u306e\u5024\u30926\u56de\u8db3\u3057\u3066\u3044\u304f(\u305f\u3060\u3057\u30016\u56de\u76ee\u306e\u5024\u306f0)\u3002\r\nconst gokei2 = ([x, ...nokori]) => (x === undefined ? 0 : x + gokei2(nokori)) \r\nconsole.log(gokei2(array1)) \/\/ 15<\/pre>\n<\/div>\n
reduce\u95a2\u6570 : \u914d\u5217\u304b\u3089\u4e00\u3064\u306e\u5024\u3092\u8fd4\u3059\u3002<\/p>\n
\n
\/\/ reduce\u3092\u4f7f\u7528\u3057\u3066\u914d\u5217\u306e\u548c\u3092\u6c42\u3081\u308b\u3002\r\n\/\/ 0\u306f\u521d\u671f\u5024\u3002\r\nconst gokei3 = arr => arr.reduce((shokei, genzaichi) => shokei + genzaichi, 0)\r\nconsole.log(gokei3(array1)) \/\/ 15<\/pre>\n<\/div>\n
\u7279\u306b\u7406\u7531\u304c\u306a\u3051\u308c\u3070reduce\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4ee5\u4e0b\u306e\u914d\u5217\u306e\u548c\u3092\u6c42\u3081\u308b\u3002 array1 = [1,2,3,4,5] slice\u95a2\u6570 : \u914d\u5217\u306e\u4e00\u90e8\u3092\u30b3\u30d4\u30fc\u3057\u3066\u8fd4\u3059\u3002 \/\/ 1\u756a\u76ee\u304b\u30895\u500b\u306e\u8981\u7d20\u3092\u30b3\u30d4\u30fc\u3057\u3066\u8fd4\u3059\u3002 console.log(array1.slice(0, … \u7d9a\u304d\u3092\u8aad\u3080 \u914d\u5217\u306e\u5408\u8a08\u3092\u6c42\u3081\u308b<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[15],"tags":[],"_links":{"self":[{"href":"https:\/\/www.kd2.jp\/memo3\/index.php?rest_route=\/wp\/v2\/posts\/280"}],"collection":[{"href":"https:\/\/www.kd2.jp\/memo3\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.kd2.jp\/memo3\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.kd2.jp\/memo3\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.kd2.jp\/memo3\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=280"}],"version-history":[{"count":13,"href":"https:\/\/www.kd2.jp\/memo3\/index.php?rest_route=\/wp\/v2\/posts\/280\/revisions"}],"predecessor-version":[{"id":320,"href":"https:\/\/www.kd2.jp\/memo3\/index.php?rest_route=\/wp\/v2\/posts\/280\/revisions\/320"}],"wp:attachment":[{"href":"https:\/\/www.kd2.jp\/memo3\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=280"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.kd2.jp\/memo3\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=280"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.kd2.jp\/memo3\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=280"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}