{"id":16766,"date":"2024-03-15T13:35:44","date_gmt":"2024-03-15T13:35:44","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-are-the-methods-for-defining-and-using-arrays-in-typescript\/"},"modified":"2025-08-07T05:42:35","modified_gmt":"2025-08-07T05:42:35","slug":"what-are-the-methods-for-defining-and-using-arrays-in-typescript","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-are-the-methods-for-defining-and-using-arrays-in-typescript\/","title":{"rendered":"What are the methods for defining and using arrays in T&#8230;"},"content":{"rendered":"<p>In TypeScript, the definition and usage of arrays are similar to JavaScript. Below are common methods for defining and using arrays.<\/p>\n<ol>\n<li>Declare an array.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">let<\/span> <span class=\"hljs-attr\">arr<\/span>: <span class=\"hljs-built_in\">number<\/span>[]; <span class=\"hljs-comment\">\/\/ \u58f0\u660e\u4e00\u4e2a\u53ea\u80fd\u5b58\u50a8 number \u7c7b\u578b\u7684\u6570\u7ec4<\/span>\r\n<span class=\"hljs-keyword\">let<\/span> <span class=\"hljs-attr\">arr<\/span>: <span class=\"hljs-title class_\">Array<\/span>&lt;<span class=\"hljs-built_in\">number<\/span>&gt;; <span class=\"hljs-comment\">\/\/ \u4f7f\u7528\u6cdb\u578b\u58f0\u660e\u4e00\u4e2a\u53ea\u80fd\u5b58\u50a8 number \u7c7b\u578b\u7684\u6570\u7ec4<\/span>\r\n<span class=\"hljs-keyword\">let<\/span> <span class=\"hljs-attr\">arr<\/span>: <span class=\"hljs-built_in\">any<\/span>[]; <span class=\"hljs-comment\">\/\/ \u58f0\u660e\u4e00\u4e2a\u53ef\u4ee5\u5b58\u50a8\u4efb\u610f\u7c7b\u578b\u7684\u6570\u7ec4<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>Initialize an array:<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">let<\/span> <span class=\"hljs-attr\">arr<\/span>: <span class=\"hljs-built_in\">number<\/span>[] = [<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span>]; <span class=\"hljs-comment\">\/\/ \u521d\u59cb\u5316\u4e00\u4e2a\u5b58\u50a8 number \u7c7b\u578b\u7684\u6570\u7ec4\uff0c\u5e76\u8d4b\u503c<\/span>\r\n<span class=\"hljs-keyword\">let<\/span> <span class=\"hljs-attr\">arr<\/span>: <span class=\"hljs-title class_\">Array<\/span>&lt;<span class=\"hljs-built_in\">number<\/span>&gt; = [<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span>]; <span class=\"hljs-comment\">\/\/ \u4f7f\u7528\u6cdb\u578b\u521d\u59cb\u5316\u4e00\u4e2a\u5b58\u50a8 number \u7c7b\u578b\u7684\u6570\u7ec4\uff0c\u5e76\u8d4b\u503c<\/span>\r\n<span class=\"hljs-keyword\">let<\/span> <span class=\"hljs-attr\">arr<\/span>: <span class=\"hljs-built_in\">any<\/span>[] = [<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-string\">'two'<\/span>, <span class=\"hljs-literal\">true<\/span>]; <span class=\"hljs-comment\">\/\/ \u521d\u59cb\u5316\u4e00\u4e2a\u53ef\u4ee5\u5b58\u50a8\u4efb\u610f\u7c7b\u578b\u7684\u6570\u7ec4\uff0c\u5e76\u8d4b\u503c<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>Accessing array elements.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">let<\/span> <span class=\"hljs-attr\">arr<\/span>: <span class=\"hljs-built_in\">number<\/span>[] = [<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span>];\r\n<span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(arr[<span class=\"hljs-number\">0<\/span>]); <span class=\"hljs-comment\">\/\/ \u8f93\u51fa 1<\/span>\r\n<span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(arr[<span class=\"hljs-number\">1<\/span>]); <span class=\"hljs-comment\">\/\/ \u8f93\u51fa 2<\/span>\r\n<span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(arr[<span class=\"hljs-number\">2<\/span>]); <span class=\"hljs-comment\">\/\/ \u8f93\u51fa 3<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>Length of array:<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">let<\/span> <span class=\"hljs-attr\">arr<\/span>: <span class=\"hljs-built_in\">number<\/span>[] = [<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span>];\r\n<span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(arr.<span class=\"hljs-property\">length<\/span>); <span class=\"hljs-comment\">\/\/ \u8f93\u51fa 3<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>Traverse the array:<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">let<\/span> <span class=\"hljs-attr\">arr<\/span>: <span class=\"hljs-built_in\">number<\/span>[] = [<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span>];\r\n<span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-keyword\">let<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; arr.<span class=\"hljs-property\">length<\/span>; i++) {\r\n  <span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(arr[i]);\r\n}\r\n\r\n<span class=\"hljs-comment\">\/\/ \u6216\u8005\u4f7f\u7528 forEach \u65b9\u6cd5<\/span>\r\narr.<span class=\"hljs-title function_\">forEach<\/span>(<span class=\"hljs-function\"><span class=\"hljs-params\">element<\/span> =&gt;<\/span> {\r\n  <span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(element);\r\n});\r\n<\/code><\/pre>\n<ol>\n<li>Add elements to the array.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">let<\/span> <span class=\"hljs-attr\">arr<\/span>: <span class=\"hljs-built_in\">number<\/span>[] = [<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span>];\r\narr.<span class=\"hljs-title function_\">push<\/span>(<span class=\"hljs-number\">4<\/span>); <span class=\"hljs-comment\">\/\/ \u6dfb\u52a0\u5143\u7d20\u5230\u6570\u7ec4\u672b\u5c3e<\/span>\r\narr.<span class=\"hljs-title function_\">unshift<\/span>(<span class=\"hljs-number\">0<\/span>); <span class=\"hljs-comment\">\/\/ \u6dfb\u52a0\u5143\u7d20\u5230\u6570\u7ec4\u5f00\u5934<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>Remove array elements.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">let<\/span> <span class=\"hljs-attr\">arr<\/span>: <span class=\"hljs-built_in\">number<\/span>[] = [<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span>];\r\narr.<span class=\"hljs-title function_\">pop<\/span>(); <span class=\"hljs-comment\">\/\/ \u5220\u9664\u6570\u7ec4\u672b\u5c3e\u7684\u5143\u7d20<\/span>\r\narr.<span class=\"hljs-title function_\">shift<\/span>(); <span class=\"hljs-comment\">\/\/ \u5220\u9664\u6570\u7ec4\u5f00\u5934\u7684\u5143\u7d20<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>Merge arrays.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">let<\/span> <span class=\"hljs-attr\">arr1<\/span>: <span class=\"hljs-built_in\">number<\/span>[] = [<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span>];\r\n<span class=\"hljs-keyword\">let<\/span> <span class=\"hljs-attr\">arr2<\/span>: <span class=\"hljs-built_in\">number<\/span>[] = [<span class=\"hljs-number\">4<\/span>, <span class=\"hljs-number\">5<\/span>, <span class=\"hljs-number\">6<\/span>];\r\n<span class=\"hljs-keyword\">let<\/span> <span class=\"hljs-attr\">arr3<\/span>: <span class=\"hljs-built_in\">number<\/span>[] = arr1.<span class=\"hljs-title function_\">concat<\/span>(arr2); <span class=\"hljs-comment\">\/\/ \u6570\u7ec4\u62fc\u63a5<\/span>\r\n<span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(arr3); <span class=\"hljs-comment\">\/\/ \u8f93\u51fa [1, 2, 3, 4, 5, 6]<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>Slicing arrays:<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">let<\/span> <span class=\"hljs-attr\">arr<\/span>: <span class=\"hljs-built_in\">number<\/span>[] = [<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span>, <span class=\"hljs-number\">4<\/span>, <span class=\"hljs-number\">5<\/span>];\r\n<span class=\"hljs-keyword\">let<\/span> <span class=\"hljs-attr\">slicedArr<\/span>: <span class=\"hljs-built_in\">number<\/span>[] = arr.<span class=\"hljs-title function_\">slice<\/span>(<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">4<\/span>); <span class=\"hljs-comment\">\/\/ \u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u6570\u7ec4\uff0c\u5305\u542b\u539f\u6570\u7ec4\u4e2d\u6307\u5b9a\u7684\u5f00\u59cb\u548c\u7ed3\u675f\u7d22\u5f15\u4e4b\u95f4\u7684\u5143\u7d20<\/span>\r\n<span class=\"hljs-variable language_\">console<\/span>.<span class=\"hljs-title function_\">log<\/span>(slicedArr); <span class=\"hljs-comment\">\/\/ \u8f93\u51fa [2, 3, 4]<\/span>\r\n<\/code><\/pre>\n<p>The above are some common array definitions and usage methods, there are many other methods available in both TypeScript and JavaScript documentation that you can refer to.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In TypeScript, the definition and usage of arrays are similar to JavaScript. Below are common methods for defining and using arrays. Declare an array. let arr: number[]; \/\/ \u58f0\u660e\u4e00\u4e2a\u53ea\u80fd\u5b58\u50a8 number \u7c7b\u578b\u7684\u6570\u7ec4 let arr: Array&lt;number&gt;; \/\/ \u4f7f\u7528\u6cdb\u578b\u58f0\u660e\u4e00\u4e2a\u53ea\u80fd\u5b58\u50a8 number \u7c7b\u578b\u7684\u6570\u7ec4 let arr: any[]; \/\/ \u58f0\u660e\u4e00\u4e2a\u53ef\u4ee5\u5b58\u50a8\u4efb\u610f\u7c7b\u578b\u7684\u6570\u7ec4 Initialize an array: let arr: number[] = [1, 2, 3]; \/\/ \u521d\u59cb\u5316\u4e00\u4e2a\u5b58\u50a8 [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[453,1402,299,1404,1403],"class_list":["post-16766","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-development","tag-guide","tag-programming","tag-technology","tag-tutorial"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What are the methods for defining and using arrays in T... - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn about what are the methods for defining and using arrays in typescript?. 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