{"id":3252,"date":"2016-07-12T15:16:42","date_gmt":"2016-07-12T15:16:42","guid":{"rendered":"https:\/\/kiencang.net\/?p=3252"},"modified":"2022-08-21T01:14:33","modified_gmt":"2022-08-20T18:14:33","slug":"so-sanh-logic-javascript","status":"publish","type":"post","link":"https:\/\/kiencang.net\/so-sanh-logic-javascript\/","title":{"rendered":"C\u00e1c to\u00e1n t\u1eed So s\u00e1nh v\u00e0 Logic trong JavaScript"},"content":{"rendered":"\n<p>To\u00e1n t\u1eed So s\u00e1nh v\u00e0 Logic \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ki\u1ec3m tra <code>true<\/code> ho\u1eb7c <code>false<\/code>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_60 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >M\u1ee5c l\u1ee5c<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\" role=\"button\"><label for=\"item-6577d7332094f\" ><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input aria-label=\"Toggle\" aria-label=\"item-6577d7332094f\"  type=\"checkbox\" id=\"item-6577d7332094f\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/kiencang.net\/so-sanh-logic-javascript\/#Cac_toan_tu_so_sanh\" title=\"C\u00e1c to\u00e1n t\u1eed so s\u00e1nh\">C\u00e1c to\u00e1n t\u1eed so s\u00e1nh<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/kiencang.net\/so-sanh-logic-javascript\/#Chung_co_the_duoc_su_dung_nhu_the_nao\" title=\"Ch\u00fang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 th\u1ebf n\u00e0o?\">Ch\u00fang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 th\u1ebf n\u00e0o?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/kiencang.net\/so-sanh-logic-javascript\/#Toan_tu_Logic\" title=\"To\u00e1n t\u1eed Logic\">To\u00e1n t\u1eed Logic<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/kiencang.net\/so-sanh-logic-javascript\/#Toan_tu_dieu_kien_ba_ngoi\" title=\"To\u00e1n t\u1eed \u0111i\u1ec1u ki\u1ec7n ba ng\u00f4i\">To\u00e1n t\u1eed \u0111i\u1ec1u ki\u1ec7n ba ng\u00f4i<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/kiencang.net\/so-sanh-logic-javascript\/#Cac_kieu_so_sanh_khac_nhau\" title=\"C\u00e1c ki\u1ec3u so s\u00e1nh kh\u00e1c nhau\">C\u00e1c ki\u1ec3u so s\u00e1nh kh\u00e1c nhau<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/kiencang.net\/so-sanh-logic-javascript\/#Toan_tu_bitwise_trong_JavaScript\" title=\"To\u00e1n t\u1eed bitwise trong&nbsp;JavaScript\">To\u00e1n t\u1eed bitwise trong&nbsp;JavaScript<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cac_toan_tu_so_sanh\"><\/span>C\u00e1c to\u00e1n t\u1eed so s\u00e1nh<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>To\u00e1n t\u1eed so s\u00e1nh \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e2u l\u1ec7nh logic \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh t\u00ednh b\u1eb1ng nhau ho\u1eb7c kh\u00e1c nhau gi\u1eefa c\u00e1c bi\u1ebfn ho\u1eb7c gi\u00e1 tr\u1ecb.<\/p>\n\n\n\n<p>Cho x gi\u00e1 tr\u1ecb l\u00e0 5 (x = 5), b\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y gi\u1ea3i th\u00edch c\u00e1c to\u00e1n t\u1eed so s\u00e1nh:<\/p>\n\n\n\n<figure class=\"wp-block-table w3-table-all notranslate is-style-stripes\"><table><tbody><tr><th>To\u00e1n t\u1eed<\/th><th>M\u00f4 t\u1ea3<\/th><th>So s\u00e1nh<\/th><th>Tr\u1ea3 v\u1ec1<\/th><\/tr><tr><td>==<\/td><td>b\u1eb1ng nhau<\/td><td>x == 8<\/td><td>false<\/td><\/tr><tr><td>x == 5<\/td><td>true<\/td><\/tr><tr><td>x == &#8220;5&#8221;<\/td><td>true<\/td><\/tr><tr><td>===<\/td><td>b\u1eb1ng v\u1ec1 gi\u00e1 tr\u1ecb v\u00e0 ki\u1ec3u<\/td><td>x === 5<\/td><td>true<\/td><\/tr><tr><td>x === &#8220;5&#8221;<\/td><td>false<\/td><\/tr><tr><td>!=<\/td><td>kh\u00f4ng b\u1eb1ng nhau<\/td><td>x != 8<\/td><td>true<\/td><\/tr><tr><td>!==<\/td><td>kh\u00f4ng b\u1eb1ng v\u1ec1 gi\u00e1 tr\u1ecb ho\u1eb7c kh\u00f4ng b\u1eb1ng v\u1ec1 ki\u1ec3u<\/td><td>x !== 5<\/td><td>false<\/td><\/tr><tr><td>x !== &#8220;5&#8221;<\/td><td>true<\/td><\/tr><tr><td>x !== 8<\/td><td>true<\/td><\/tr><tr><td>&gt;<\/td><td>l\u1edbn h\u01a1n<\/td><td>x &gt; 8<\/td><td>false<\/td><\/tr><tr><td>&lt;<\/td><td>nh\u1ecf h\u01a1n<\/td><td>x &lt; 8<\/td><td>true<\/td><\/tr><tr><td>&gt;=<\/td><td>l\u1edbn h\u01a1n ho\u1eb7c b\u1eb1ng<\/td><td>x &gt;= 8<\/td><td>false<\/td><\/tr><tr><td>&lt;=<\/td><td>nh\u1ecf h\u01a1n ho\u1eb7c b\u1eb1ng<\/td><td>x &lt;= 8<\/td><td>true<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Chung_co_the_duoc_su_dung_nhu_the_nao\"><\/span>Ch\u00fang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 th\u1ebf n\u00e0o?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>To\u00e1n t\u1eed so s\u00e1nh c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong <a href=\"https:\/\/kiencang.net\/cau-lenh-if-else-trong-javascript\/\" target=\"_blank\" rel=\"noreferrer noopener\">c\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n if else<\/a> \u0111\u1ec3 so s\u00e1nh c\u00e1c gi\u00e1 tr\u1ecb v\u00e0 th\u1ef1c hi\u1ec7n h\u00e0nh \u0111\u1ed9ng d\u1ef1a tr\u00ean k\u1ebft qu\u1ea3:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>if (tuoi &lt; 18) {text = \"C\u00f2n non v\u00e0 xanh l\u1eafm\";}<\/code><\/pre>\n\n\n\n<p>B\u1ea1n s\u1ebd h\u1ecdc nhi\u1ec1u h\u01a1n v\u1ec1 s\u1eed d\u1ee5ng c\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n trong ch\u01b0\u01a1ng k\u1ebf ti\u1ebfp.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Toan_tu_Logic\"><\/span>To\u00e1n t\u1eed Logic<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>To\u00e1n t\u1eed logic \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh logic gi\u1eefa c\u00e1c bi\u1ebfn v\u00e0 gi\u00e1 tr\u1ecb.<\/p>\n\n\n\n<p>Cho <strong>x = 6<\/strong> v\u00e0 <strong>y = 3<\/strong>,<strong>&nbsp;<\/strong>b\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y gi\u1ea3i th\u00edch c\u00e1c to\u00e1n t\u1eed logic:<\/p>\n\n\n\n<figure class=\"wp-block-table w3-table-all notranslate\"><table><tbody><tr><th>To\u00e1n t\u1eed<\/th><th>M\u00f4 t\u1ea3<\/th><th>V\u00ed d\u1ee5<\/th><\/tr><tr><td>&amp;&amp;<\/td><td>v\u00e0<\/td><td>(x &lt; 10 &amp;&amp; y &gt; 1) is true<\/td><\/tr><tr><td>||<\/td><td>ho\u1eb7c<\/td><td>(x == 5 || y == 5) is false<\/td><\/tr><tr><td>!<\/td><td>ph\u1ee7 \u0111\u1ecbnh<\/td><td>!(x == y) is true<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>To\u00e1n t\u1eed logic c\u1ee7a JS c\u0169ng r\u1ea5t gi\u1ed1ng v\u1edbi PHP.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Toan_tu_dieu_kien_ba_ngoi\"><\/span>To\u00e1n t\u1eed \u0111i\u1ec1u ki\u1ec7n ba ng\u00f4i<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>JavaScript c\u0169ng bao g\u1ed3m to\u00e1n t\u1eed \u0111i\u1ec1u ki\u1ec7n ch\u1ec9 \u0111\u1ecbnh gi\u00e1 tr\u1ecb cho bi\u1ebfn d\u1ef1a tr\u00ean m\u1ed9t s\u1ed1 \u0111i\u1ec1u ki\u1ec7n.<\/p>\n\n\n\n<p>C\u00fa ph\u00e1p:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>variablename = (\u0111i\u1ec1u ki\u1ec7n) ? gi\u00e1 tr\u1ecb 1:gi\u00e1 tr\u1ecb 2<\/code><\/pre>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var voteable = (age &lt; 18) ? \"Qu\u00e1 tr\u1ebb\":\"\u0110\u1ee7 tu\u1ed5i\";<\/code><\/pre>\n\n\n\n<p>N\u1ebfu bi\u1ebfn age c\u00f3 gi\u00e1 tr\u1ecb d\u01b0\u1edbi 18, gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ebfn <code>voteable<\/code> s\u1ebd l\u00e0 &#8220;Qu\u00e1 tr\u1ebb&#8221;, ng\u01b0\u1ee3c l\u1ea1i, gi\u00e1 tr\u1ecb c\u1ee7a <code>voteable<\/code> s\u1ebd l\u00e0 &#8220;\u0110\u1ee7 tu\u1ed5i&#8221;.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cac_kieu_so_sanh_khac_nhau\"><\/span>C\u00e1c ki\u1ec3u so s\u00e1nh kh\u00e1c nhau<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>So s\u00e1nh d\u1eef li\u1ec7u v\u1edbi c\u00e1c ki\u1ec3u kh\u00e1c nhau c\u00f3 th\u1ec3 d\u1eabn t\u1edbi c\u00e1c k\u1ebft qu\u1ea3 kh\u00f4ng mong mu\u1ed1n.<\/p>\n\n\n\n<p>Khi so s\u00e1nh m\u1ed9t chu\u1ed7i v\u1edbi m\u1ed9t s\u1ed1, JavaScript s\u1ebd chuy\u1ec3n \u0111\u1ed5i chu\u1ed7i th\u00e0nh s\u1ed1 \u0111\u1ec3 ti\u1ebfn h\u00e0nh so s\u00e1nh. Chu\u1ed7i r\u1ed7ng s\u1ebd \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i th\u00e0nh 0. M\u1ed9t chu\u1ed7i kh\u00f4ng ph\u1ea3i s\u1ed1 s\u1ebd \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i th\u00e0nh <code>NaN<\/code> v\u1edbi k\u1ebft qu\u1ea3 lu\u00f4n l\u00e0 <code>false<\/code>.<\/p>\n\n\n\n<figure class=\"wp-block-table w3-table-all notranslate\"><table><tbody><tr><th>Tr\u01b0\u1eddng h\u1ee3p<\/th><th>Gi\u00e1 tr\u1ecb<\/th><\/tr><tr><td>2 &lt; 12<\/td><td>true<\/td><\/tr><tr><td>2 &lt; &#8220;12&#8221;<\/td><td>true<\/td><\/tr><tr><td>2 &lt; &#8220;\u0110\u1ee9c Anh&#8221;<\/td><td>false<\/td><\/tr><tr><td>2 &gt; &#8220;\u0110\u1ee9c Anh&#8221;<\/td><td>false<\/td><\/tr><tr><td>2 == &#8220;\u0110\u1ee9c Anh&#8221;<\/td><td>false<\/td><\/tr><tr><td>&#8220;2&#8221; &lt; &#8220;12&#8221;<\/td><td>false<\/td><\/tr><tr><td>&#8220;2&#8221; &gt; &#8220;12&#8221;<\/td><td>true<\/td><\/tr><tr><td>&#8220;2&#8221; == &#8220;12&#8221;<\/td><td>false<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Khi so s\u00e1nh hai chu\u1ed7i, &#8220;2&#8221; s\u1ebd l\u1edbn h\u01a1n &#8220;12&#8221;, b\u1edfi v\u00ec 1 nh\u1ecf h\u01a1n 2 theo th\u1ee9 t\u1ef1 abc.<\/p>\n\n\n\n<p>\u0110\u1ec3 \u0111\u1ea3m b\u1ea3o k\u1ebft qu\u1ea3 ph\u00f9 h\u1ee3p, c\u00e1c bi\u1ebfn n\u00ean \u0111\u01b0\u1ee3c <a href=\"https:\/\/kiencang.net\/chuyen-doi-dinh-dang-trong-javascript\/\" target=\"_blank\" rel=\"noreferrer noopener\">chuy\u1ec3n \u0111\u1ed5i v\u1ec1 ki\u1ec3u d\u1eef li\u1ec7u th\u00edch h\u1ee3p<\/a> tr\u01b0\u1edbc khi so s\u00e1nh:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>age = Number(age);\n\nif (isNaN(age)) {\n   voteable = \"Gi\u00e1 tr\u1ecb nh\u1eadp v\u00e0o l\u1ed7i\";\n} \n\nelse {\n   voteable = (age &lt; 18) ? \"Qu\u00e1 tr\u1ebb\" : \"\u0110\u1ee7 tu\u1ed5i\";\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Toan_tu_bitwise_trong_JavaScript\"><\/span>To\u00e1n t\u1eed bitwise trong&nbsp;JavaScript<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>To\u00e1n t\u1eed Bit l\u00e0m vi\u1ec7c v\u1edbi c\u00e1c s\u1ed1 32-bit.<\/p>\n\n\n\n<p>K\u1ebft qu\u1ea3 \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i tr\u1edf l\u1ea1i v\u1ec1 d\u1ea1ng s\u1ed1 trong JavaScript.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><th>To\u00e1n t\u1eed<\/th><th>M\u00f4 t\u1ea3<\/th><th>V\u00ed d\u1ee5<\/th><th>Gi\u1ed1ng nh\u01b0<\/th><th>K\u1ebft qu\u1ea3<\/th><th>H\u1ec7 th\u1eadp ph\u00e2n<\/th><\/tr><tr><td>&amp;<\/td><td>AND<\/td><td>x = 5 &amp; 1<\/td><td>0101 &amp; 0001<\/td><td>0001<\/td><td>1<\/td><\/tr><tr><td>|<\/td><td>OR<\/td><td>x = 5 | 1<\/td><td>0101 | 0001<\/td><td>0101<\/td><td>5<\/td><\/tr><tr><td>~<\/td><td>NOT<\/td><td>x = ~ 5<\/td><td>&nbsp;~0101<\/td><td>1010<\/td><td>10<\/td><\/tr><tr><td>^<\/td><td>XOR<\/td><td>x = 5 ^ 1<\/td><td>0101 ^ 0001<\/td><td>0100<\/td><td>4<\/td><\/tr><tr><td>&lt;&lt;<\/td><td>Left shift<\/td><td>x = 5 &lt;&lt; 1<\/td><td>0101 &lt;&lt; 1<\/td><td>1010<\/td><td>10<\/td><\/tr><tr><td>&gt;&gt;<\/td><td>Right shift<\/td><td>x = 5 &gt;&gt; 1<\/td><td>0101 &gt;&gt; 1<\/td><td>0010<\/td><td>2<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>V\u00ed d\u1ee5 trong b\u1ea3ng tr\u00ean s\u1eed d\u1ee5ng 4 bits unsigned. Nh\u01b0ng JavaScript s\u1eed d\u1ee5ng s\u1ed1 32-bit signed<\/p>\n\n\n\n<p>B\u1edfi v\u00ec \u0111i\u1ec1u \u0111\u00f3, trong JavaScript, ~ 5 s\u1ebd kh\u00f4ng tr\u1ea3 v\u1ec1 10. N\u00f3 s\u1ebd tr\u1ea3 v\u1ec1 -6:<br>~00000000000000000000000000000101 s\u1ebd tr\u1ea3 v\u1ec1 11111111111111111111111111111010<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<p>x = 5 &amp; 1;<br>K\u1ebft qu\u1ea3 trong x:<br>1<\/p>\n\n\n\n<p>&#8212;<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<p>x = 5 | 1;<br>K\u1ebft qu\u1ea3 trong x:<br>5<\/p>\n\n\n\n<p>&#8212;<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<p>x = 5 &gt;&gt; 1;<br>K\u1ebft qu\u1ea3 trong x:<br>2<\/p>\n\n\n\n<p>&#8212;<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<p>x = 5 &lt;&lt; 1;<br>K\u1ebft qu\u1ea3 trong x:<br>10<\/p>\n\n\n\n<p>&#8212;<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<p>x = ~ 5;<br>K\u1ebft qu\u1ea3 trong x:<br>-6<\/p>\n","protected":false},"excerpt":{"rendered":"<p>To\u00e1n t\u1eed So s\u00e1nh v\u00e0 Logic \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ki\u1ec3m tra true ho\u1eb7c false. C\u00e1c to\u00e1n t\u1eed so s\u00e1nh To\u00e1n t\u1eed so s\u00e1nh \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e2u l\u1ec7nh logic \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh t\u00ednh b\u1eb1ng nhau ho\u1eb7c kh\u00e1c nhau gi\u1eefa c\u00e1c bi\u1ebfn ho\u1eb7c gi\u00e1 tr\u1ecb. Cho x gi\u00e1 tr\u1ecb l\u00e0 5 (x = 5), &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[236],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C\u00e1c to\u00e1n t\u1eed So s\u00e1nh v\u00e0 Logic trong JavaScript &#8226; Ki\u1ebfn c\u00e0ng<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kiencang.net\/so-sanh-logic-javascript\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C\u00e1c to\u00e1n t\u1eed So s\u00e1nh v\u00e0 Logic trong JavaScript &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"To\u00e1n t\u1eed So s\u00e1nh v\u00e0 Logic \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ki\u1ec3m tra true ho\u1eb7c false. C\u00e1c to\u00e1n t\u1eed so s\u00e1nh To\u00e1n t\u1eed so s\u00e1nh \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e2u l\u1ec7nh logic \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh t\u00ednh b\u1eb1ng nhau ho\u1eb7c kh\u00e1c nhau gi\u1eefa c\u00e1c bi\u1ebfn ho\u1eb7c gi\u00e1 tr\u1ecb. 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C\u00e1c to\u00e1n t\u1eed so s\u00e1nh To\u00e1n t\u1eed so s\u00e1nh \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e2u l\u1ec7nh logic \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh t\u00ednh b\u1eb1ng nhau ho\u1eb7c kh\u00e1c nhau gi\u1eefa c\u00e1c bi\u1ebfn ho\u1eb7c gi\u00e1 tr\u1ecb. 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