{"id":1968,"date":"2021-08-24T14:10:25","date_gmt":"2021-08-24T05:10:25","guid":{"rendered":"https:\/\/suzutukiblog.com\/?p=1968"},"modified":"2023-01-06T01:31:37","modified_gmt":"2023-01-05T16:31:37","slug":"javascript3","status":"publish","type":"post","link":"https:\/\/suzutukiblog.com\/index.php\/2021\/08\/24\/javascript3\/","title":{"rendered":"JavaScript\u5b66\u7fd2\u306e\u307e\u3068\u30813(forEach\uff64reduce\u95a2\u6570)"},"content":{"rendered":"

2.5\u304b\u3089\u7d9a\u304d\u307e\u3059<\/a><\/p>\n

1:\u914d\u5217\u3068forEach\u30e1\u30bd\u30c3\u30c9<\/h3>\n

HTML\u306e\u8a18\u8ff0\u306f1\u3068\u540c\u3058\u306a\u306e\u3067\u7701\u7565<\/p>\n

main.js\u306e\u8a18\u8ff0<\/h3>\n
\n
const arry = [1, 2, 3, 4, 5];\r\n\r\n\/\/ \u5909\u6570\u540d\u306f\u4f55\u3067\u3082\u3044\u3044\u306e\u3067v,forEach\u3092\u4f7f\u3063\u305f\u307b\u3046\u304c\u8a18\u8ff0\u304c\u5c11\u306a\u3044\r\n  arry.forEach(function(v, i, ary) {\r\n    console.log(v, i, ary);\r\n})\r\n\r\n\/\/ \u30a2\u30ed\u30fc\u95a2\u6570\u306e\u8a18\u6cd5\u3060\u3068\u66f4\u306b\u7701\u7565\u3067\u304d\u308b\r\n  arry.forEach(v => console.log(v));<\/code><\/pre>\n<\/div>\n
\u691c\u8a3c\u3057\u3066\u5b9f\u884c\u7d50\u679c\u3092\u78ba\u304b\u3081\u308b\u3068\u30fb\u30fb\u30fb<\/h3>\n
\"\"<\/p>\n
<\/p>\n
\u30dd\u30a4\u30f3\u30c8
\n\u7b2c\u4e00\u5f15\u6570\u306b\u914d\u5217\u306e\u5024[1,2,3,4,5]\u3001\u7b2c\u4e8c\u5f15\u6570\u306b\u6dfb\u3048\u5b57\u306e\u5024\u3001\u7b2c\u4e09\u5f15\u6570\u306b\u914d\u5217\u304c\u3042\u308b\u3002<\/div>\n
2:\u914d\u5217\u3068reduce\u30e1\u30bd\u30c3\u30c9<\/h3>\n
HTML\u306e\u8a18\u8ff0\u306f1\u3068\u540c\u3058\u306a\u306e\u3067\u7701\u7565<\/p>\n
main.js\u306e\u8a18\u8ff0<\/h3>\n
\n
const arry = [1, 2, 3, 4, 5];\r\n\r\n\/\/ reduce\u306e\u7b2c\uff12\u5f15\u6570\u3092\u6307\u5b9a\u3057\u306a\u3044\u5834\u5408\u306b\u306f\u3001accu\u306b\u914d\u5217\u306e0\u756a\u76ee\u3001\r\n\/\/ curr\u306b\u914d\u5217\u306e\uff11\u756a\u76ee\u306e\u8981\u7d20\u304c\u6e21\u3063\u3066\u304f\u308b\r\n\/\/ arry.reduce(function (accu, curr) {\r\n\/\/ console.log(accu, curr);\r\n\/\/ return accu + curr;\r\n\/\/ });\r\n\/\/ \u521d\u671f\u5024\u3092\u8a2d\u5b9a\u3059\u308b\u3068\u304d\u300210\u304c\u6700\u521d\u306baccu\u3001curr\u306b1(\u914d\u5217\u306e\u6700\u521d)\u304c\u6e21\u3063\u3066\u304f\u308b\r\n  arry.reduce(function (accu, curr) {\r\n  console.log(accu, curr);\r\n  return accu + curr;\r\n}, 10);\r\n\r\n  const str = \"animation\";\r\n  const strArry = str.split(\"\");\r\n\r\n  console.log(strArry);\r\n\r\n  const result = strArry.reduce((accu, curr) => {\r\n  console.log(accu);\r\n\/\/ \u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30ea\u30c6\u30e9\u30eb\r\n  return `${accu}<${curr}>`;\r\n\/\/ \u4e0a\u3068\u4e0b\u306f\u540c\u3058\u3060\u3088\r\n\/\/ return accu + \"<\" + curr + \">\";\r\n\/\/ \u521d\u671f\u5024\u306b\u7a7a\u6587\u5b57\u2019\u2019\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067<a><n><i><m><a><t><i><o><n>\u3068\u3059\u308b\r\n}, \"\");\r\n\r\n  console.log(result);<\/code><\/pre>\n<\/div>\n
\u691c\u8a3c\u3057\u3066\u5b9f\u884c\u7d50\u679c\u3092\u78ba\u304b\u3081\u308b\u3068\u30fb\u30fb\u30fb<\/h3>\n
\"\"<\/p>\n
\u521d\u671f\u5024\u306b10\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u306e\u306710\u3068\u914d\u5217\u306e1\u756a\u76ee\u306e1\u304c\u6e21\u308b\u3002<\/p>\n
10+1\u306711\u3068\u914d\u5217\u306e2\u756a\u3081\u306e2\u304c\u8868\u793a\u3055\u308c\u3066\u3044\u308b\u3002\u4ee5\u4e0b\u30eb\u30fc\u30d7\u3057\u3066\u3044\u304f<\/p>\n
.split\u306b\u3088\u3063\u3066\u4f5c\u308c\u3066\u3057\u307e\u3046<\/p>\n
\u57fa\u672c\u306e\u5f62\u3067\u3053\u308c\u3092reduce\u3067\u52a0\u5de5\u3059\u308b\u3068<\/p>\n
<a><n><i><m><a><t><i><o><n>\u304c\u3064\u304f\u308c\u308b\u3002\u521d\u671f\u5024\u306e””\u304c\u30df\u30bd<\/strong><\/p>\n
3:reduce\u95a2\u6570<\/h3>\n
HTML\u306e\u8a18\u8ff0\u306f1\u3068\u540c\u3058\u306a\u306e\u3067\u7701\u7565<\/p>\n
main.js\u306e\u8a18\u8ff0<\/h3>\n
\n
\/\/ \u76ee\u6a19\u306fanimation\u3092<>\u4ed8\u304d\u306b\u3059\u308b\r\n\/\/ const str = 'animation';\r\n\/\/ split\u306b\u3057\u3066\u5206\u5272\u3057\u3066\u914d\u5217\u306b\u3059\u308b\r\n\/\/ const strArry = str.split('');\r\n\/\/ function tag(accu, curr) {\r\n\/\/ return `${accu}<${curr}>`;\r\n\/\/ }\r\n\/\/ const result = strArry.reduce(tag, \"\");\r\n\/\/ console.log(result);\r\n\/\/ \u5b9f\u884c\u7d50\u679c<a><n><i><m><a><t><i><o><n>\r\n\r\n\/\/ \u4e0a\u306e\u5b9f\u884c\u7d50\u679c\u3092reduce\u95a2\u6570\u3067\u5f97\u308b\u306b\u306f\uff1f\r\n\/\/ \u5909\u6570str\u306b'animation'\u3092\u683c\u7d0d\r\nconst str = 'animation';\r\n\/\/ split\u306b\u3057\u3066\u5206\u5272\u3057\u3066\u914d\u5217\u306b\u3057\u305f\u3082\u306e\u3092strArry\u306b\u683c\u7d0d\r\nconst strArry = str.split('');\r\nconsole.log(strArry)\r\n\/\/['a', 'n', 'i', 'm', 'a', 't', 'i', 'o', 'n']\u304c\u4f5c\u6210\u3055\u308c\u308b\r\n\r\n\/\/ tag\u306f\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\r\nfunction tag(accu, curr) {\r\n\/\/console.log(accu);\r\nreturn `${accu}<${curr}>`;\r\n}\r\n\/\/ reduce\u95a2\u6570\u304c\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u53d7\u3051\u308b\u95a2\u6570\u3067\u4eca\u56de\u7b2c\u4e09\u5f15\u6570\u306e\"\"\u304c\u5fc5\u8981\r\nfunction reduce(arry, callback, defaultValue) {\r\n\/\/ \u521d\u671f\u5024\"\"\u3092accu\u306b\u4ee3\u5165\r\nlet accu = defaultValue;\r\nfor(let i = 0; i < arry.length; i++) {\r\n   let curr = arry[i];\r\n   \/\/callback\u306baccu\u3068curr\u3092\u4ee3\u5165\u3057\u3066\u623b\u308a\u5024\u3092\u4ee3\u5165\u3057\u3066\u3044\u308b\r\n   accu = callback(accu, curr);\r\n   console.log(accu);\r\n}\r\n\/\/ <a><n><i><m><a><t><i><o><n>\u304c\u623b\u308a\u5024\r\n   return accu;\r\n}\r\n\/\/ \u5206\u5272\u3057\u3066\u914d\u5217\u306b\u3057\u305f\u3082\u306e\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3001\u521d\u671f\u5024\u306b\u7a7a\u6587\u5b57\r\n\/\/ reduce\u95a2\u6570\u3092\u547c\u3073\u51fa\u3059\r\nconst result = reduce(strArry, tag, \"\");\r\nconsole.log(result);<\/code><\/pre>\n<\/div>\n
\u691c\u8a3c\u3057\u3066\u5b9f\u884c\u7d50\u679c\u3092\u78ba\u304b\u3081\u308b\u3068\u30fb\u30fb\u30fb<\/h3>\n
\"\"<\/p>\n
\n
    \n
  1. 1\u884c\u76ee\u306fconsole.log(strArry)<\/strong>\u306e\u90e8\u5206<\/li>\n
  2. 2\u884c\u76ee~10\u884c\u76ee\u306fconsole.log(accu);\u306e\u90e8\u5206\u3067\u307e\u305a\u306f\u3058\u3081\u306breduce\u95a2\u6570\u304c\u547c\u3073\u3055\u308c\u308b(\u7b2c\u4e00\u5f15\u6570\u306e\u4e2d\u8eab[‘a’, ‘n’, ‘i’, ‘m’, ‘a’, ‘t’, ‘i’, ‘o’, ‘n’]\u3001\u7b2c\u4e8c\u5f15\u6570\u306e\u4e2d\u8eab\u95a2\u6570tag\u3001\u7b2c\u4e09\u5f15\u6570\u306b\u7a7a\u6587\u5b57(”))
    \n<\/span><\/span>\u5909\u6570let\u306b\u7a7a\u6587\u5b57(”)\u3092\u4ee3\u5165\u3059\u308b\u3002\u6b21\u306bfor\u6587\u3067\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u8a18\u8ff0\u3057\u3066\u5909\u6570curr\u306b\u914d\u5217\u306e<\/span><\/span><\/span><\/p>\n
    \n
    [‘a’, ‘n’, ‘i’, ‘m’, ‘a’, ‘t’, ‘i’, ‘o’, ‘n’]\u3092\u306f\u3058\u3081\u304b\u3089\u7d42\u308f\u308a\u307e\u3067\u9806\u756a\u306b\u7e70\u308a\u8fd4\u3059\u3088\u3046\u306b\u3059\u308b\u3002
    \n\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570tag\u3092\u547c\u3073\u51fa\u3059\u3002(\u7b2c\u4e00\u5f15\u6570\u306b(”)\u7b2c\u4e8c\u5f15\u6570\u306b\u5148\u7a0b\u306ecurr)<\/div>\n
    \u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306b\u3088\u308a[‘a’, ‘n’, ‘i’, ‘m’, ‘a’, ‘t’, ‘i’, ‘o’, ‘n’]\u306e\u5404\u6587\u5b57\u306b<>\u304c\u52a0\u308f\u308a\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u304c\u884c\u308f\u308c\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u304c\u884c\u308f\u308c\u3066\u3044\u308b\u69d8\u5b50\u304c\u51fa\u529b\u3055\u308c\u308b\u3002<\/div>\n<\/div>\n<\/li>\n
  3. 11\u884c\u76ee\u306f\u30eb\u30fc\u30d7\u51e6\u7406\u304c\u7d42\u308f\u3063\u3066\u52a0\u5de5\u304c\u7d42\u308f\u3063\u305f\u3082\u306e\u304c\u51fa\u529b\u3055\u308c\u308b\u3002<\/li>\n<\/ol>\n<\/div>\n
    \u203b\u30dd\u30a4\u30f3\u30c8
    \nconsole.log\u3067\u9014\u4e2d\u3092\u89b3\u5bdf\u3057\u3066\u307f\u308b\u3068\u7406\u89e3\u3057\u3084\u3059\u304f\u306a\u308b\u3002<\/div>\n
    \u305d\u306e4\u306b\u7d9a\u304d\u307e\u3059<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
    2.5\u304b\u3089\u7d9a\u304d\u307e\u3059 1:\u914d\u5217\u3068forEach\u30e1\u30bd\u30c3\u30c9 HTML\u306e\u8a18\u8ff0\u306f1\u3068\u540c\u3058\u306a\u306e\u3067\u7701\u7565 main.js\u306e\u8a18\u8ff0 const arry = [1, 2, 3, 4, 5]; \/\/ \u5909\u6570\u540d\u306f\u4f55\u3067\u3082\u3044\u3044\u306e\u3067v,forEach\u3092 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[17,27],"tags":[],"class_list":["post-1968","post","type-post","status-publish","format-standard","hentry","category-javascript","category-programming-note"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/posts\/1968","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/comments?post=1968"}],"version-history":[{"count":25,"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/posts\/1968\/revisions"}],"predecessor-version":[{"id":7278,"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/posts\/1968\/revisions\/7278"}],"wp:attachment":[{"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/media?parent=1968"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/categories?post=1968"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/suzutukiblog.com\/index.php\/wp-json\/wp\/v2\/tags?post=1968"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}