{"id":4475,"date":"2025-12-13T11:49:21","date_gmt":"2025-12-13T02:49:21","guid":{"rendered":"https:\/\/dennie.tokyo\/it\/?p=4475"},"modified":"2025-12-14T08:43:03","modified_gmt":"2025-12-13T23:43:03","slug":"%e3%80%90javascript%e3%80%91%e3%82%a2%e3%83%ad%e3%83%bc%e9%96%a2%e6%95%b0","status":"publish","type":"post","link":"https:\/\/dennie.tokyo\/it\/?p=4475","title":{"rendered":"\u3010javascript\u3011\u30a2\u30ed\u30fc\u95a2\u6570"},"content":{"rendered":"\n

\u30a2\u30ed\u30fc\u95a2\u6570\u306f”function”\u3001”return”\u306e\u8a18\u8f09\u3092\u7701\u7565\u51fa\u6765\u308b\u8a18\u8f09\u624b\u6cd5\u3067\u3059\u3002<\/p>\n\n\n\n\n\n\n\n

\u6700\u5c0f\u306e\u8a18\u8f09<\/h1>\n\n\n\n

“function”\u3001”return”\u3001”{}” \u306e\u7701\u7565\u3002<\/p>\n\n\n\n

\/\/ function \u3068 return \u306e\u7701\u7565\nconst getOne = () => 1;\nconsole.log(getOne()); \/\/ 1<\/code><\/pre><\/div>\n\n\n\n
\u5f15\u6570<\/h1>\n\n\n\n
\u5f15\u6570\u304c1\u3064<\/h2>\n\n\n\n
\u5f15\u6570\u304c1\u3064\u306e\u5834\u5408\u3001”()” \u3092\u7701\u7565\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
const addCount = cnt => 1 + cnt;\nconsole.log(addCount(1)); \/\/ 2<\/code><\/pre><\/div>\n\n\n\n
\u5f15\u6570\u304c\u8907\u6570<\/h2>\n\n\n\n
\u5f15\u6570\u304c\u8907\u6570\u306e\u5834\u5408\u3001”()” \u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n
const addition = (n, m) => n + m;\nconsole.log(addition(1, 2)); \/\/ 3<\/code><\/pre><\/div>\n\n\n\n
\u5f15\u6570\u304c\u306a\u3044<\/h2>\n\n\n\n
\u5f15\u6570\u304c\u306a\u3044\u5834\u5408\u3001”()” \u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n
const getOne = () => 1;\nconsole.log(getOne()); \/\/ 1<\/code><\/pre><\/div>\n\n\n\n
return\u306e\u7701\u7565<\/h1>\n\n\n\n
return\u5206\u304c\u7701\u7565\u51fa\u6765\u308b\u6761\u4ef6\u306f\u4ee5\u4e0b\u306e2\u3064\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
    \n
  • \u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c81\u3064\u3002(\u30ef\u30f3\u30e9\u30a4\u30ca\u30fc\u306e\u8a18\u8f09\u304c\u51fa\u6765\u308b)<\/li>\n\n\n\n
  • \u623b\u308a\u5024\u304c\u305d\u306e\u307e\u307e\u5229\u7528\u51fa\u6765\u308b<\/li>\n<\/ul>\n\n\n\n
    const overFive = n => n > 5 ? true : false;\nconsole.log(overFive(6)); \/\/ true<\/code><\/pre><\/div>\n\n\n\n
    “{}”\u306e\u5fc5\u8981\u6027<\/h1>\n\n\n\n
    \u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u304c\u8907\u6570\u306b\u306a\u308b\u5834\u5408\u3002”{}”\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n
    const example = (n, m) => {\n    if(!n){\n        return "n\u304c\u306a\u3044!!"\n    }\n    if(!m){\n        return "m\u304c\u306a\u3044!!"\n    }\n};\nconsole.log(example('a', '')); \/\/ m\u304c\u306a\u3044!!<\/code><\/pre><\/div>\n\n\n\n
    \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u8fd4\u5374<\/h1>\n\n\n\n
    \u30ef\u30f3\u30e9\u30a4\u30ca\u30fc\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8fd4\u5374\u3059\u308b\u5834\u5408\u3001”()”\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n
    const sample = () => ({a:"aaaa"});\nconsole.log(sample()); \/\/ { a: 'aaaa' }<\/code><\/pre><\/div>\n\n\n\n
    \u305f\u3060\u3057\u3001\u4ee5\u4e0b\u306e\u5834\u5408\u306f\u4e0d\u8981\u3067\u3059\u3002<\/p>\n\n\n\n
    const obj = {\n    a: "aaaa"\n}\n\nconst sample = () => obj;\nconsole.log(sample()); \/\/ { a: 'aaaa' }<\/code><\/pre><\/div>\n\n\n\n
    \u6700\u5f8c\u306b<\/h1>\n\n\n\n
    \u30a2\u30ed\u30fc\u95a2\u6570\u306f\u7c21\u6613\u306a\u51e6\u7406\u3092\u884c\u3046\u5834\u5408\u306b\u4f7f\u7528\u3059\u308b\u3068\u3088\u3055\u305d\u3046\u3067\u3059\u3002\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306e\u8a18\u8f09\u306b\u3082\u4f7f\u3048\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u30a2\u30ed\u30fc\u95a2\u6570\u306f”function”\u3001”return”\u306e\u8a18\u8f09\u3092\u7701\u7565\u51fa\u6765\u308b\u8a18\u8f09\u624b\u6cd5\u3067\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":4348,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22],"tags":[],"class_list":["post-4475","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript"],"_links":{"self":[{"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts\/4475","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4475"}],"version-history":[{"count":11,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts\/4475\/revisions"}],"predecessor-version":[{"id":4500,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts\/4475\/revisions\/4500"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/media\/4348"}],"wp:attachment":[{"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4475"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4475"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4475"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}