JS-Arrays.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>JS Arrays</title>
    <style>
      * {
        font-family: Arial, Helvetica, sans-serif;
      }

      table {
        font-family: arial, sans-serif;
        border-collapse: collapse;
        width: 50%;
      }

      td,
      th {
        border: 1px solid #dddddd;
        text-align: left;
        padding: 8px;
      }

      tr:nth-child(even) {
        background-color: #dddddd;
      }

      code[class*="language-"],
      pre[class*="language-"] {
        color: black;
        background: none;
        background-color: rgba(0, 0, 0, 0);
        font-family: Consolas, Monaco, "Andale Mono", "Ubuntu Mono", monospace;
        font-size: 1em;
        text-align: left;
        white-space: pre;
        word-spacing: normal;
        word-break: normal;
        word-wrap: normal;
        line-height: 1.5;
        -moz-tab-size: 4;
        -o-tab-size: 4;
        tab-size: 4;
        -webkit-hyphens: none;
        -moz-hyphens: none;
        -ms-hyphens: none;
        hyphens: none;
      }

      :not(pre) > code[class*="language-"]::after,
      pre[class*="language-"]::after {
        right: 0.75em;

        left: auto;

        -webkit-transform: rotate(2deg);

        -moz-transform: rotate(2deg);

        -ms-transform: rotate(2deg);

        -o-transform: rotate(2deg);

        transform: rotate(2deg);
      }
      pre[class*="language-"]::before,
      pre[class*="language-"]::after {
        content: "";

        z-index: -2;

        display: block;

        position: absolute;

        bottom: 0.75em;

        left: 0.18em;

        width: 40%;

        height: 20%;

        max-height: 13em;

        -webkit-transform: rotate(-2deg);

        -moz-transform: rotate(-2deg);

        -ms-transform: rotate(-2deg);

        -o-transform: rotate(-2deg);

        transform: rotate(-2deg);
      }

      :not(pre) > code[class*="language-"],
      pre[class*="language-"] {
        background-color: #fdfdfd;

        -webkit-box-sizing: border-box;

        -moz-box-sizing: border-box;

        box-sizing: border-box;

        margin-bottom: 1em;
      }
      pre[class*="language-"] {
        position: relative;

        margin: 0.5em 0;

        margin-bottom: 0.5em;

        overflow: visible;

        padding: 0;
      }
      code[class*="language-"],
      pre[class*="language-"] {
        color: black;

        background: none;

        background-color: rgba(0, 0, 0, 0);

        font-family: Consolas, Monaco, "Andale Mono", "Ubuntu Mono", monospace;

        font-size: 1em;

        text-align: left;

        white-space: pre;

        word-spacing: normal;

        word-break: normal;

        word-wrap: normal;

        line-height: 1.5;

        -moz-tab-size: 4;

        -o-tab-size: 4;

        tab-size: 4;

        -webkit-hyphens: none;

        -moz-hyphens: none;

        -ms-hyphens: none;

        hyphens: none;
      }
      pre {
        display: block;

        font-size: 87.5%;

        color: #212529;
      }
      pre {
        margin-top: 0;

        margin-bottom: 1rem;

        overflow: auto;

        -ms-overflow-style: scrollbar;
      }
      code,
      kbd,
      pre,
      samp {
        font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
          "Courier New", monospace;

        font-size: 1em;
      }

      pre[class*="language-"] > code {
        position: relative;
        border-left: 10px solid #358ccb;
        box-shadow: -1px 0px 0px 0px #358ccb, 0px 0px 0px 1px #dfdfdf;
        background-color: #fdfdfd;
        background-image: linear-gradient(
          transparent 50%,
          rgba(69, 142, 209, 0.04) 50%
        );
        background-size: 3em 3em;
        background-origin: content-box;
        background-attachment: local;
      }

      code[class*="language"] {
        max-height: inherit;
        height: inherit;
        padding: 0 1em;
        display: block;
        overflow: auto;
      }

      code[class*="language-"],
      pre[class*="language-"] {
        color: black;
        background: none;
        background-color: rgba(0, 0, 0, 0);
        background-attachment: scroll;
        background-image: none;
        background-size: auto;
        background-origin: padding-box;
        font-family: Consolas, Monaco, "Andale Mono", "Ubuntu Mono", monospace;
        font-size: 1em;
        text-align: left;
        white-space: pre;
        word-spacing: normal;
        word-break: normal;
        word-wrap: normal;
        line-height: 1.5;
        -moz-tab-size: 4;
        -o-tab-size: 4;
        tab-size: 4;
        -webkit-hyphens: none;
        -moz-hyphens: none;
        -ms-hyphens: none;
        hyphens: none;
      }

      pre code {
        font-size: inherit;
        color: inherit;
        word-break: normal;
      }

      code {
        font-size: 87.5%;
        color: #e83e8c;
        word-wrap: break-word;
      }
      code,
      kbd,
      pre,
      samp {
        font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
          "Courier New", monospace;
        font-size: 1em;
      }
      *,
      ::after,
      ::before {
        box-sizing: border-box;
      }
    </style>
  </head>
  <body>
    <h1>JS Arrays</h1>
    <p>
      JavaScript Array is a single variable that is used to store elements of
      different data types. JavaScript arrays are zero-indexed. The Javascript
      Arrays are not associative in nature.
    </p>
    <p>
      Arrays are used when we have a list of items. An array allows you to store
      several values with the same name and access them by using their index
      number.
    </p>
    <h1>Declaration of an Array</h1>
    <p>There are basically two ways to declare an array.</p>
    <h1>1. JavaScript array literal</h1>
    <p>The syntax of creating array using array literal is given below:</p>
    <pre
      class="language-javascript"
      tabindex="0"
    ><code class="language-javascript"><span class="token keyword">var</span> arrayname<span class="token operator">=</span><span class="token punctuation">[</span>value1<span class="token punctuation">,</span>value2<span class="token operator">...</span><span class="token punctuation">.</span><span class="token punctuation">.</span>valueN<span class="token punctuation">]</span><span class="token punctuation">;</span>  </code></pre>
    <h1>2. JavaScript Array directly (new keyword)</h1>
    <p>The syntax of creating array directly is given below:</p>
    <pre
      class="language-javascript"
      tabindex="0"
    ><code class="language-javascript"><span class="token keyword">var</span> arrayname<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">Array</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>  
</code></pre>
    <pre
      class="language-markup"
      tabindex="0"
    ><code class="language-markup"><span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>JavaScript<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span><span class="token punctuation">&gt;</span></span><span class="token script"><span class="token language-javascript">
    <span class="token keyword">var</span> ary <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">20</span><span class="token punctuation">,</span> <span class="token number">30</span><span class="token punctuation">,</span> <span class="token number">40</span><span class="token punctuation">,</span> <span class="token number">50</span><span class="token punctuation">]</span>
    document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"&lt;ul&gt;"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">for</span> <span class="token punctuation">(</span>a <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> a <span class="token operator">&lt;=</span> <span class="token number">4</span><span class="token punctuation">;</span> a<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"&lt;li&gt;"</span> <span class="token operator">+</span> ary<span class="token punctuation">[</span>a<span class="token punctuation">]</span> <span class="token operator">+</span> <span class="token string">"&lt;/li&gt;"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"&lt;/ul&gt;"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  </span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span>
</code></pre>
    <pre
      class="language-markup"
      tabindex="0"
    ><code class="language-markup"><span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>JavaScript<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span><span class="token punctuation">&gt;</span></span><span class="token script"><span class="token language-javascript">
    <span class="token keyword">var</span> ary <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">20</span><span class="token punctuation">,</span> <span class="token number">30</span><span class="token punctuation">,</span> <span class="token number">40</span><span class="token punctuation">,</span> <span class="token number">50</span><span class="token punctuation">]</span>
    <span class="token keyword">var</span> sum <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
    document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"&lt;ul&gt;"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">for</span> <span class="token punctuation">(</span>a <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> a <span class="token operator">&lt;=</span> <span class="token number">4</span><span class="token punctuation">;</span> a<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"&lt;li&gt;"</span> <span class="token operator">+</span> ary<span class="token punctuation">[</span>a<span class="token punctuation">]</span> <span class="token operator">+</span> <span class="token string">"&lt;/li&gt;"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        sum <span class="token operator">=</span> sum <span class="token operator">+</span> ary<span class="token punctuation">[</span>a<span class="token punctuation">]</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"&lt;/ul&gt;"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"Total Sum:"</span> <span class="token operator">+</span> sum<span class="token punctuation">)</span><span class="token punctuation">;</span>
  </span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span>
</code></pre>

    <pre
      class="language-markup"
      tabindex="0"
    ><code class="language-markup"><span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>JavaScript<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span><span class="token punctuation">&gt;</span></span><span class="token script"><span class="token language-javascript">
    <span class="token keyword">var</span> ary <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token number">10</span><span class="token punctuation">,</span> <span class="token string">"Harry"</span><span class="token punctuation">,</span><span class="token string">"Sarah"</span><span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
    document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"&lt;ul&gt;"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token keyword">for</span> <span class="token punctuation">(</span>a <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> a <span class="token operator">&lt;</span> <span class="token number">5</span><span class="token punctuation">;</span> a<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"&lt;li&gt;"</span> <span class="token operator">+</span> ary<span class="token punctuation">[</span>a<span class="token punctuation">]</span> <span class="token operator">+</span> <span class="token string">"&lt;/li&gt;"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"&lt;/ul&gt;"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

  </span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span></code></pre>
  </body>
  <script>
    let ary = [
      1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 23,
      24, 25, 26, 27, 28, 29, 30,
    ];
    document.write(ary);
  </script>
</html>