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class="docItemContainer_3QWW"><article><header><h1 class="docTitle_1Lrw">ÐÑо комменÑаÑии, инÑÑÑÑкÑии, вÑÑажениÑ, опеÑаÑоÑÑ</h1></header><div class="markdown"><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_2cZh" id="комменÑаÑии"></a>ÐомменÑаÑии<a aria-hidden="true" tabindex="-1" class="hash-l
26ink" href="#комменÑаÑии" title="Direct link to heading">#</a></h2><div class="mdxCodeBlock_1XEh"><div class="codeBlockContent_1u-d"><button type="button" aria-label="Copy code to clipboard" class="copyButton_10dd">Copy</button><div tabindex="0" class="prism-code language-jsx codeBlock_3iAC"><div class="codeBlockLines_b7E3" style="color:#393A34;background-color:#f6f8fa"><div class="token-line" style="color:#393A34"><span class="token comment" style="color:#999988;font-style:italic">// ÐомменÑаÑий, занимаÑÑий Ð¾Ð´Ð½Ñ ÑÑÑокÑ.</span><span class="token plain"></span></div><div class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"> 27</span></div><div class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">/* ÐомменÑаÑий,</span></div><div class="token-line" style="color:#393A34"><span class="token comment" style="color:#999988;font-style:italic"> занимаÑÑий неÑколÑко ÑÑÑок.</span></div><div class="token-line" style="color:#393A34"><span class="token comment" style="color:#999988;font-style:italic"> */</span><span class="token plain"></span></div><div class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"> 28</span></div><div class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">/* ÐелÑÐ·Ñ Ð²ÐºÐ»Ð°Ð´ÑваÑÑ /* комменÑаÑий в комменÑаÑий */</span><span class="token plain"> SyntaxError </span><span class="token operator" style="color:#393A34">*</span><span class="token operator" style="color:#393A34">/</span></div></div></div></div></div><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_2cZh" id="инÑÑÑÑкÑиÑ"></a>ÐнÑÑÑÑкÑиÑ<a aria-hidden="true" tabindex="-1" class="hash-link" href="#инÑÑÑÑкÑиÑ" title="Direct link to heading">#</a></h2><p><strong>ÐнÑÑÑÑкÑии(statements)</strong> ÑазделÑÑÑÑÑ Ñимволом <code>;</code> 29ТоÑка Ñ Ð·Ð°Ð¿ÑÑой не ÑвлÑеÑÑÑ Ð¾Ð±ÑзаÑелÑной, но еÑÑÑ Ð¼Ð¾Ð¼ÐµÐ½ÑÑ ÐºÐ¾Ð³Ð´Ð° она Ð½ÐµÐ¾Ð±Ñ Ð¾Ð´Ð¸Ð¼Ð°.</p><div class="mdx_link_wrapper"><a target="_blank" href="http://esprima.org/demo/parse.html#" class="mdx_link"><div class="mdx_link_left"><span class="mdx_link_title">Esprima: Parser</span><span class="mdx_link_href">http://esprima.org/demo/parse.html#</span></div></a><span class="mdx_link_cation"></span></div><p>ÐаÑÑÐµÑ Ð¸Ð½ÑÑÑÑкÑий, нÑжен ÑолÑко Ð´Ð»Ñ Ñого, ÑÑÐ¾Ð±Ñ Ð±Ð¾Ð»ÐµÐµ деÑалÑно изÑÑаÑÑ ÑинÑакÑиÑ.</p><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_2cZh" id="вÑÑажение"></a>ÐÑÑажение<a aria-hidden="true" tabindex="-1" class="hash-link" href="#вÑÑажение" title="Direct link to heading">#</a></h2><p><strong>ÐÑÑажение(expression)</strong> - ÑÑо один из Ñипов инÑÑÑÑкÑий, еÑÑÑ Ñ Ð¾ÑоÑее опÑеделение: "вÑе ÑÑо Ñгодно, имеÑÑее знаÑение" 30ÐÑимеÑÑ Ð²ÑÑажений:</p><div class="mdxCodeBlock_1XEh"><div class="codeBlockContent_1u-d"><button type="button" aria-label="Copy code to clipboard" class="copyButton_10dd">Copy</button><div tabindex="0" class="prism-code language-jsx codeBlock_3iAC"><div class="codeBlockLines_b7E3" style="color:#393A34;background-color:#f6f8fa"><div class="token-line" style="color:#393A34"><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">+</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// <- вÑÑажение</span><span class="token plain"></span></div><div class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token number" style="color:#36acaa">3</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">+</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">5</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">+</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">*</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">4</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// <- вÑÑажение</span><span class="token plain"></span></div><div class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">if</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">expression</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">
30{</span><span class="token plain"></span></div><div class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// <- не ÑвлÑеÑÑÑ Ð²ÑÑажением, ÑÑо инÑÑÑÑкÑÐ¸Ñ IF, но ожидаеÑÑÑ, ÑÑо в ÑÑловии бÑÐ´ÐµÑ Ð½Ð°Ñ Ð¾Ð´Ð¸ÑÑÑÑ Ð²ÑÑажение</span><span class="token plain"></span></div><div class="token-line" style="color:#393A34"><span class="token plain"> console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">log</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">5</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// <- вÑÑажение, Ñак как вÑзов ÑÑнкÑии Ñам по Ñебе Ð¸Ð¼ÐµÐµÑ Ð·Ð½Ð°Ñение, ÑÑнкÑии возвÑаÑаÑÑ ÑезÑлÑÑÐ°Ñ Ñвоей ÑабоÑÑ</span><span class="token plain"></span></div><div class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"></span></div><div class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">function</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">bar</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span></div><div class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// обÑÑвление ÑÑнкÑии в ÑÑом пÑимеÑе не ÑвлÑеÑÑÑ Ð²ÑÑажением</span><span class="token plain"></span></div><div class="token-line" style="color:#393A34"><span class="token plain"> console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">log</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span></div><div class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"></span></div><div class="token-line" style="color:#393A34"><span class="token plain">bar</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// <- вÑÑажение; Identifier expression (Скажем Ñак... ÑÑо обÑаÑение к иденÑиÑикаÑоÑÑ)</span><span class="token plain"></span></div><div class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token function" style="color:#d73a49">bar</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// <- вÑзов ÑÑнкÑии ÑвлÑеÑÑÑ Ð²ÑÑажением как и обÑаÑение к ее имени</span></div></div></div></div></div><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_2cZh" id="опеÑаÑоÑ"></a>ÐпеÑаÑоÑ<a aria-hidden="true" tabindex="-1" class="hash-link" href="#опеÑаÑоÑ" title="Direct link to heading">#</a></h2><blockquote><p>РдалÑнейÑем, Ð¼Ñ Ð±Ñдем вÑÑÑеÑаÑÑ Ñакое понÑÑие как ÑÑловие 31<strong>УÑловие</strong> â ÑÑо вÑÑажение, из коÑоÑого инÑеÑпÑеÑаÑÐ¾Ñ Ð¾Ð¶Ð¸Ð´Ð°ÐµÑ Ð¿Ð¾Ð»ÑÑиÑÑ Ð±Ñлево знаÑение. <em>ÐапÑимеÑ: <code>5 > 10</code></em> 32Так же, важно замеÑиÑÑ, ÑÑо инÑеÑпÑеÑаÑÐ¾Ñ Ð°Ð²ÑомаÑиÑеÑки поÑÑаÑаеÑÑÑ Ð¿ÑивеÑÑи Ñип к <code>boolean</code> еÑли из ÑÑÐ»Ð¾Ð²Ð¸Ñ Ð²ÐµÑнÑлоÑÑ Ð·Ð½Ð°Ñение оÑлиÑное Ð¾Ñ <code>boolean</code></p></blockquote><div class="mdxCodeBlock_1XEh"><div class="codeBlockContent_1u-d"><button type="button" aria-label="Copy code to clipboard" class="copyButton_10dd">Copy</button><div tabindex="0" class="prism-code language-jsx codeBlock_3iAC"><div class="codeBlockLines_b7E3" style="color:#393A34;background-color:#f6f8fa"><div class="token-line" style="color:#393A34"><span class="token comment" style="color:#999988;font-style:italic">// когда вÑÑÑеÑаÑÑÑÑ ÑÑловиÑ</span><span class="token plain"></span></div><div class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">if</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">ÑÑловие</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">
32{</span><span class="token plain"></span></div><div class="token-line" style="color:#393A34"><span class="token plain"> Ñело</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span></div><div class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span></div></div></div></div></div><p><strong>ÐпеÑаÑоÑ(operator)</strong> - ÑÑо ÑÐ»ÐµÐ¼ÐµÐ½Ñ Ð¿ÑогÑаммного кода, коÑоÑÑй опиÑÑÐ²Ð°ÐµÑ Ñо или иное дейÑÑвие в вÑÑажении (опеÑаÑиÑ). РболÑÑинÑÑве ÑзÑков пÑогÑаммиÑÐ¾Ð²Ð°Ð½Ð¸Ñ Ð²ÑÑокого ÑÑÐ¾Ð²Ð½Ñ Ð¾Ð¿ÐµÑаÑÐ¾Ñ - ÑÑо Ñимвол, благодаÑÑ ÐºÐ¾ÑоÑÐ¾Ð¼Ñ Ð¼Ð¾Ð³ÑÑ Ð¿ÑоизводиÑÑÑÑ ÑазлиÑнÑе Ð²Ð¸Ð´Ñ Ð²ÑÑиÑлений, ÑÑавнений или пÑиÑваиваний Ñ ÑÑаÑÑием одного или неÑколÑкиÑ
знаÑений.</p><p><strong>ÐпеÑанд</strong> - ÑÑо знаÑение, пеÑÐµÐ¼ÐµÐ½Ð½Ð°Ñ Ð¸Ð»Ð¸ вÑÑажение, коÑоÑое ÑаÑположено Ñлева или ÑпÑава Ð¾Ñ Ð¾Ð¿ÐµÑаÑоÑа.</p><div class="mdxCodeBlock_1XEh"><div class="codeBlockContent_1u-d"><button type="button" aria-label="Copy code to clipboard" class="copyButton_10dd">Copy</button><div tabindex="0" class="prism-code language-jsx codeBlock_3iAC"><div class="codeBlockLines_b7E3" style="color:#393A34;background-color:#f6f8fa"><div class="token-line" style="color:#393A34"><span class="token number" style="color:#36acaa">1</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">+</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">3</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span></div><div class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">// РпÑимеÑе вÑÑе</span><span class="token plain"></span></div><div class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">// "+" â ÑÑо опеÑаÑоÑ</span><span class="token plain"></span></div><div class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic">// "1", "3" â ÑÑо опеÑандÑ</span><span class="token plain"></span></div><div class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token number" style="color:#36acaa">1</span><span class="token operator" style="color:#393A34">++</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// "++" ÑÑо ÑнаÑнÑй опеÑаÑÐ¾Ñ "поÑÑÑикÑнÑй инкÑеменÑ"</span><span class="token plain"></span></div><div class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34">++</span><span class="token number" style="color:#36acaa">1</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// "++" ÑÑо ÑнаÑнÑй опеÑаÑÐ¾Ñ "пÑеÑикÑнÑй инкÑеменÑ"</span></div></div></div></div></div><p>ÐпеÑаÑоÑÑ Ð±ÑваÑÑ:</p><ul><li><strong>УнаÑнÑе:</strong> когда Ñ Ð¾Ð¿ÐµÑаÑоÑом иÑполÑзÑеÑÑÑ ÑолÑко один опеÑанд</li><li><strong>ÐинаÑнÑе:</strong> когда Ñ Ð¾Ð¿ÐµÑаÑоÑом иÑполÑзÑеÑÑÑ Ð´Ð²Ð° опеÑанда</li><li><strong>ТеÑнаÑнÑе:</strong> когда Ñ Ð¾Ð¿ÐµÑаÑоÑом иÑполÑзÑеÑÑÑ ÑÑи опеÑанда.</li></ul><div class="admonition admonition-info alert alert--info"><div class="admonition-heading"><h5><span class="admonition-icon"><svg xmlns="http://www.w3.org/2000/svg" width="14" height="16" viewB
32ox="0 0 14 16"><path fill-rule="evenodd" d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"></path></svg></span>info</h5></div><div class="admonition-content"><p>ЧаÑе вÑего ÑеÑнаÑнÑй опеÑаÑÐ¾Ñ Ð² ÑзÑÐºÐ°Ñ ÑолÑко один, поÑÑÐ¾Ð¼Ñ ÐµÐ³Ð¾ Ñак и назÑваÑÑ <em>ÑеÑнаÑнÑм</em></p></div></div><div class="admonition admonition-note alert alert--secondary"><div class="admonition-heading"><h5><span class="admonition-icon"><svg xmlns="http://www.w3.org/2000/svg" width="14" height="16" viewBox="0 0 14 16"><path fill-rule="evenodd" d="M6.3 5.69a.942.942 0 0 1-.28-.7c0-.28.09-.52.28-.7.19-.18.42-.28.7-.28.28 0 .52.09.7.28.18.19.28.42.28.7 0 .28-.09.52-.28.7a1 1 0 0 1-.7.3c-.28 0-.52-.11-.7-.3zM8 7.99c-.02-.25-.11-.48-.31-.69-.2-.19-.42-.3-.69-.31H6c-.27.02-.48.13-.69.31-.2.2-.3.44-.31.69h1v3c.02.27.11.5.31.69.2.2.42.31.69.31h1c.27 0 .48-.11.69-.31.2-.19.3-.42.31-.69H8V7.98v.01zM7 2.3c-3.14 0-5.7 2.54-5.7 5.68 0 3.14 2.56 5.7 5.7 5.7s5.7-2.55 5.7-5.7c0-3.15-2.56-5.69-5.7-5.69v.01zM7 .98c3.86 0 7 3.14 7 7s-3.14 7-7 7-7-3.12-7-7 3.14-7 7-7z"></path></svg></span>note</h5></div><div class="admonition-content"><p>ÐÑдÑÑ Ð¾Ð¿ÐµÑаÑоÑÑ, коÑоÑÑе Ð¼Ñ Ð½Ðµ бÑдем докÑменÑиÑоваÑÑ, Ñакие как:</p><ul><li>ÐоÑÑÑп к ÑвойÑÑвам (<code>object.property</code>, <code>object["property"]</code>)</li><li><code>await</code> 33...</li></ul><p><em>Ðажно замеÑиÑÑ, ÑÑо в ÑÑом ÑпÑавоÑнике Ñлово <strong>опеÑаÑоÑ</strong> бÑÐ´ÐµÑ Ð¾ÑноÑиÑÑÑÑ Ðº Ñаким инÑÑÑÑкÑиÑм как <strong>if else</strong> ÑÑо немного конÑликÑÑÐµÑ Ñ Ð¾Ð¿Ñеделение, но Ñак бÑÐ´ÐµÑ Ñдобнее и во Ð¼Ð½Ð¾Ð³Ð¸Ñ Ð¼Ð°ÑеÑÐ¸Ð°Ð»Ð°Ñ Ñакое вÑÑÑеÑаеÑÑÑ</em></p></div></div><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_2cZh" id="пÑиоÑиÑеÑ-опеÑаÑоÑов"></a>ÐÑиоÑиÑÐµÑ Ð¾Ð¿ÐµÑаÑоÑов<a aria-hidden="true" tabindex="-1" class="hash-link" href="#пÑиоÑиÑеÑ-опеÑаÑоÑов" title="Direct link to heading">#</a></h3><p><code>TODO: ÑделаÑÑ ÑаблиÑÑ</code></p></div></article><div class="margin-vert--xl"><div class="row"><div class="col"><a href="https://github.com/VLZH/re-js-course/tree/master/docs/js/comments_statements_expressions.mdx" target="_blank" rel="noreferrer noopener"><svg fill="currentColor" height="1.2em" width="1.2em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 40 40" style="margin-right:0.3em;vertical-align:sub"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div></div></div><div class="margin-vert--lg"><nav class="pagination-nav" aria-label="Blog list page navigation"><div class="pagination-nav__item"><a class="pagination-nav__link" href="/timeline"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">« Ð¢ÐµÐ¼Ñ Ð¸ поÑÑдок изÑÑениÑ</div></a></div><div class="pagination-nav__item pagination-nav__item--next"><a class="pagination-nav__link" href="/js/basic_statements"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">ÐазовÑе инÑÑÑÑкÑии »</div></a></div></nav></div></div></div><div class="col col--3"><div class="tableOfContents_3klQ"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#комменÑаÑии" class="table-of-contents__link">ÐомменÑаÑии</a></li><li><a href="#инÑÑÑÑкÑиÑ" class="table-of-contents__link">ÐнÑÑÑÑкÑиÑ</a></li><li><a href="#вÑÑажение" class="table-of-contents__link">ÐÑÑажение</a></li><li><a href="#опеÑаÑоÑ" class="table-of-contents__link">ÐпеÑаÑоÑ</a><ul><li><a href="#пÑиоÑиÑеÑ-опеÑаÑоÑов" class="table-of-contents__link">ÐÑиоÑиÑÐµÑ Ð¾Ð¿ÐµÑаÑоÑов</a></li></ul></li></ul></div></div></div></div></main></div></div><footer class="footer footer--dark"><div class="container"><div class="text--center"><div>Copyright © 2020 https://github/VLZH. Built with Docusaurusð¦.<
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