python-cheatsheet/web/script_2.js

const TOC_MOBILE =
  '<strong>ToC</strong> = {\n' +
  '    <strong><span class="hljs-string">\'1. Collections\'</span></strong>: [<a href="#list">List</a>, <a href="#dictionary">Dictionary</a>, <a href="#set">Set</a>,\n' +
  '                       <a href="#tuple">Tuple</a>, <a href="#range">Range</a>, <a href="#enumerate">Enumerate</a>,\n' +
  '                       <a href="#iterator">Iterator</a>, <a href="#generator">Generator</a>],\n' +
  '    <strong><span class="hljs-string">\'2. Types\'</span></strong>:       [<a href="#type">Type</a>, <a href="#string">String</a>, <a href="#regex">Regular_Exp</a>,\n' +
  '                       <a href="#format">Format</a>, <a href="#numbers">Numbers</a>,\n' +
  '                       <a href="#combinatorics">Combinatorics</a>, <a href="#datetime">Datetime</a>],\n' +
  '    <strong><span class="hljs-string">\'3. Syntax\'</span></strong>:      [<a href="#arguments">Args</a>, <a href="#inline">Inline</a>, <a href="#closure">Closure</a>,\n' +
  '                       <a href="#decorator">Decorator</a>, <a href="#class">Class</a>,\n' +
  '                       <a href="#ducktypes">Duck_Types</a>, <a href="#enum">Enum</a>,\n' +
  '                       <a href="#exceptions">Exceptions</a>],\n' +
  '    <strong><span class="hljs-string">\'4. System\'</span></strong>:      [<a href="#print">Print</a>, <a href="#input">Input</a>,\n' +
  '                       <a href="#commandlinearguments">Command_Line_Arguments</a>,\n' +
  '                       <a href="#open">Open</a>, <a href="#path">Path</a>,\n' +
  '                       <a href="#oscommands">Command_Execution</a>],\n' +
  '    <strong><span class="hljs-string">\'5. Data\'</span></strong>:        [<a href="#json">JSON</a>, <a href="#pickle">Pickle</a>, <a href="#csv">CSV</a>, <a href="#sqlite">SQLite</a>,\n' +
  '                       <a href="#bytes">Bytes</a>, <a href="#struct">Struct</a>, <a href="#array">Array</a>,\n' +
  '                       <a href="#memoryview">MemoryView</a>, <a href="#deque">Deque</a>],\n' +
  '    <strong><span class="hljs-string">\'6. Advanced\'</span></strong>:    [<a href="#threading">Threading</a>, <a href="#operator">Operator</a>,\n' +
  '                       <a href="#introspection">Introspection</a>,\n' +
  '                       <a href="#metaprograming">Metaprograming</a>, <a href="#eval">Eval</a>,\n' +
  '                       <a href="#coroutine">Coroutine</a>],\n' +
  '    <strong><span class="hljs-string">\'7. Libraries\'</span></strong>:   [<a href="#progressbar">Progress_Bar</a>, <a href="#plot">Plot</a>, <a href="#table">Table</a>,\n' +
  '                       <a href="#curses">Curses</a>, <a href="#logging">Logging</a>, <a href="#scraping">Scraping</a>,\n' +
  '                       <a href="#web">Web</a>, <a href="#profiling">Profile</a>, <a href="#numpy">NumPy</a>,\n' +
  '                       <a href="#image">Image</a>, <a href="#animation">Animation</a>, <a href="#audio">Audio</a>,\n' +
  '                       <a href="#synthesizer">Synthesizer</a>]\n' +
  '}\n';

const DIAGRAM_1_A = 
  '+-------------+-------------+\n' +
  '|   Classes   | Metaclasses |\n' +
  '+-------------+-------------|\n' +
  '|   MyClass --> MyMetaClass |\n';

const DIAGRAM_1_B =
  '┏━━━━━━━━━━━━━┯━━━━━━━━━━━━━┓\n' +
  '┃   Classes   │ Metaclasses ┃\n' +
  '┠─────────────┼─────────────┨\n' +
  '┃   MyClass ──→ MyMetaClass ┃\n' +
  '┃             │     ↓       ┃\n' +
  '┃    object ─────→ type ←╮  ┃\n' +
  '┃             │    ↑ ╰───╯  ┃\n' +
  '┃     str ─────────╯        ┃\n' +
  '┗━━━━━━━━━━━━━┷━━━━━━━━━━━━━┛\n';

const DIAGRAM_2_A =
  '+-------------+-------------+\n' +
  '|   Classes   | Metaclasses |\n' +
  '+-------------+-------------|\n' +
  '|   MyClass   | MyMetaClass |\n';

const DIAGRAM_2_B =
  '┏━━━━━━━━━━━━━┯━━━━━━━━━━━━━┓\n' +
  '┃   Classes   │ Metaclasses ┃\n' +
  '┠─────────────┼─────────────┨\n' +
  '┃   MyClass   │ MyMetaClass ┃\n' +
  '┃      ↓      │     ↓       ┃\n' +
  '┃    object ←───── type     ┃\n' +
  '┃      ↑      │             ┃\n' +
  '┃     str     │             ┃\n' +
  '┗━━━━━━━━━━━━━┷━━━━━━━━━━━━━┛\n';

const DIAGRAM_3_A =
  '+------------------+------------+------------+------------+\n' +
  '|                  |  Sequence  | Collection |  Iterable  |\n' +
  '+------------------+------------+------------+------------+\n';

const DIAGRAM_3_B =
  '┏━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━┯━━━━━━━━━━━━┯━━━━━━━━━━━━┓\n' +
  '┃                  │  Sequence  │ Collection │  Iterable  ┃\n' +
  '┠──────────────────┼────────────┼────────────┼────────────┨\n' +
  '┃ list, range, str │     ✓      │     ✓      │     ✓      ┃\n' +
  '┃ dict, set        │            │     ✓      │     ✓      ┃\n' +
  '┃ iter             │            │            │     ✓      ┃\n' +
  '┗━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━┷━━━━━━━━━━━━┷━━━━━━━━━━━━┛\n';

const DIAGRAM_4_A =
  '+--------------------+----------+----------+----------+----------+----------+\n' +
  '|                    | Integral | Rational |   Real   | Complex  |  Number  |\n' +
  '+--------------------+----------+----------+----------+----------+----------+\n';

const DIAGRAM_4_B =
  '┏━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━┯━━━━━━━━━━┯━━━━━━━━━━┯━━━━━━━━━━┯━━━━━━━━━━┓\n' +
  '┃                    │ Integral │ Rational │   Real   │ Complex  │  Number  ┃\n' +
  '┠────────────────────┼──────────┼──────────┼──────────┼──────────┼──────────┨\n' +
  '┃ int                │    ✓     │    ✓     │    ✓     │    ✓     │    ✓     ┃\n' +
  '┃ fractions.Fraction │          │    ✓     │    ✓     │    ✓     │    ✓     ┃\n' +
  '┃ float              │          │          │    ✓     │    ✓     │    ✓     ┃\n' +
  '┃ complex            │          │          │          │    ✓     │    ✓     ┃\n' +
  '┃ decimal.Decimal    │          │          │          │          │    ✓     ┃\n' +
  '┗━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━┷━━━━━━━━━━┷━━━━━━━━━━┷━━━━━━━━━━┷━━━━━━━━━━┛\n';
 
const DIAGRAM_5_A = 
  "+---------------+-----------------+-----------------+-----------------+-----------------+\n" +
  "|               |    {<float>}    |   {<float>:f}   |   {<float>:e}   |   {<float>:%}   |\n" +
  "+---------------+-----------------+-----------------+-----------------+-----------------+\n";

const DIAGRAM_5_B =
  "┏━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━┓\n" +
  "┃               │    {&lt;float&gt;}    │   {&lt;float&gt;:f}   │   {&lt;float&gt;:e}   │   {&lt;float&gt;:%}   ┃\n" +
  "┠───────────────┼─────────────────┼─────────────────┼─────────────────┼─────────────────┨\n" +
  "┃   0.000056789 │    '5.6789e-05' │     '0.000057'  │  '5.678900e-05' │     '0.005679%' ┃\n" +
  "┃   0.00056789  │    '0.00056789' │     '0.000568'  │  '5.678900e-04' │     '0.056789%' ┃\n" +
  "┃   0.0056789   │    '0.0056789'  │     '0.005679'  │  '5.678900e-03' │     '0.567890%' ┃\n" +
  "┃   0.056789    │    '0.056789'   │     '0.056789'  │  '5.678900e-02' │     '5.678900%' ┃\n" +
  "┃   0.56789     │    '0.56789'    │     '0.567890'  │  '5.678900e-01' │    '56.789000%' ┃\n" +
  "┃   5.6789      │    '5.6789'     │     '5.678900'  │  '5.678900e+00' │   '567.890000%' ┃\n" +
  "┃  56.789       │   '56.789'      │    '56.789000'  │  '5.678900e+01' │  '5678.900000%' ┃\n" +
  "┃ 567.89        │  '567.89'       │   '567.890000'  │  '5.678900e+02' │ '56789.000000%' ┃\n" +
  "┗━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━┛\n";

const DIAGRAM_6_A =
  "+---------------+-----------------+-----------------+-----------------+-----------------+\n" +
  "|               |   {<float>:.2}  |  {<float>:.2f}  |  {<float>:.2e}  |  {<float>:.2%}  |\n" +
  "+---------------+-----------------+-----------------+-----------------+-----------------+\n";

const DIAGRAM_6_B =
  "┏━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━┓\n" +
  "┃               │   {&lt;float&gt;:.2}  │  {&lt;float&gt;:.2f}  │  {&lt;float&gt;:.2e}  │  {&lt;float&gt;:.2%}  ┃\n" +
  "┠───────────────┼─────────────────┼─────────────────┼─────────────────┼─────────────────┨\n" +
  "┃   0.000056789 │    '5.7e-05'    │       '0.00'    │    '5.68e-05'   │       '0.01%'   ┃\n" +
  "┃   0.00056789  │    '0.00057'    │       '0.00'    │    '5.68e-04'   │       '0.06%'   ┃\n" +
  "┃   0.0056789   │    '0.0057'     │       '0.01'    │    '5.68e-03'   │       '0.57%'   ┃\n" +
  "┃   0.056789    │    '0.057'      │       '0.06'    │    '5.68e-02'   │       '5.68%'   ┃\n" +
  "┃   0.56789     │    '0.57'       │       '0.57'    │    '5.68e-01'   │      '56.79%'   ┃\n" +
  "┃   5.6789      │    '5.7'        │       '5.68'    │    '5.68e+00'   │     '567.89%'   ┃\n" +
  "┃  56.789       │    '5.7e+01'    │      '56.79'    │    '5.68e+01'   │    '5678.90%'   ┃\n" +
  "┃ 567.89        │    '5.7e+02'    │     '567.89'    │    '5.68e+02'   │   '56789.00%'   ┃\n" +
  "┗━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━┛\n";

const DIAGRAM_7_A =
  '+------------+------------+------------+------------+--------------+\n' +
  '|            |  Iterable  | Collection |  Sequence  | abc.Sequence |\n' +
  '+------------+------------+------------+------------+--------------+\n';

const DIAGRAM_7_B =
  '┏━━━━━━━━━━━━┯━━━━━━━━━━━━┯━━━━━━━━━━━━┯━━━━━━━━━━━━┯━━━━━━━━━━━━━━┓\n' +
  '┃            │  Iterable  │ Collection │  Sequence  │ abc.Sequence ┃\n' +
  '┠────────────┼────────────┼────────────┼────────────┼──────────────┨\n' +
  '┃ iter()     │     !      │     !      │     ✓      │      ✓       ┃\n' +
  '┃ contains() │     ✓      │     ✓      │     ✓      │      ✓       ┃\n' +
  '┃ len()      │            │     !      │     !      │      !       ┃\n' +
  '┃ getitem()  │            │            │     !      │      !       ┃\n' +
  '┃ reversed() │            │            │     ✓      │      ✓       ┃\n' +
  '┃ index()    │            │            │            │      ✓       ┃\n' +
  '┃ count()    │            │            │            │      ✓       ┃\n' +
  '┗━━━━━━━━━━━━┷━━━━━━━━━━━━┷━━━━━━━━━━━━┷━━━━━━━━━━━━┷━━━━━━━━━━━━━━┛\n';

const DIAGRAM_8_A =
  'BaseException\n' +
  ' +-- SystemExit';

const DIAGRAM_8_B =
  "BaseException\n" +
  " ├── SystemExit                   <span class='hljs-comment'># Raised by the sys.exit() function.</span>\n" +
  " ├── KeyboardInterrupt            <span class='hljs-comment'># Raised when the user hits the interrupt key (ctrl-c).</span>\n" +
  " └── Exception                    <span class='hljs-comment'># User-defined exceptions should be derived from this class.</span>\n" +
  "      ├── StopIteration           <span class='hljs-comment'># Raised by next() when run on an empty iterator.</span>\n" +
  "      ├── ArithmeticError         <span class='hljs-comment'># Base class for arithmetic errors.</span>\n" +
  "      │    └── ZeroDivisionError  <span class='hljs-comment'># Raised when dividing by zero.</span>\n" +
  "      ├── AttributeError          <span class='hljs-comment'># Raised when an attribute is missing.</span>\n" +
  "      ├── EOFError                <span class='hljs-comment'># Raised by input() when it hits end-of-file condition.</span>\n" +
  "      ├── LookupError             <span class='hljs-comment'># Raised when a look-up on a sequence or dict fails.</span>\n" +
  "      │    ├── IndexError         <span class='hljs-comment'># Raised when a sequence index is out of range.</span>\n" +
  "      │    └── KeyError           <span class='hljs-comment'># Raised when a dictionary key is not found.</span>\n" +
  "      ├── NameError               <span class='hljs-comment'># Raised when a variable name is not found.</span>\n" +
  "      ├── OSError                 <span class='hljs-comment'># Failures such as “file not found” or “disk full”.</span>\n" +
  "      │    └── FileNotFoundError  <span class='hljs-comment'># When a file or directory is requested but doesn't exist.</span>\n" +
  "      ├── RuntimeError            <span class='hljs-comment'># Raised by errors that don't fall in other categories.</span>\n" +
  "      │    └── RecursionError     <span class='hljs-comment'># Raised when the the maximum recursion depth is exceeded.</span>\n" +
  "      ├── TypeError               <span class='hljs-comment'># Raised when an argument is of wrong type.</span>\n" +
  "      └── ValueError              <span class='hljs-comment'># When an argument is of right type but inappropriate value.</span>\n" +
  "           └── UnicodeError       <span class='hljs-comment'># Raised when encoding/decoding strings from/to bytes fails.</span>\n";

const DIAGRAM_9_A =
  '+------------------+--------------+--------------+--------------+\n' +
  '|                  |     excel    |   excel_tab  | unix_dialect |\n' +
  '+------------------+--------------+--------------+--------------+\n';

const DIAGRAM_9_B =
  "┏━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━┓\n" +
  "┃                  │     excel    │   excel_tab  │ unix_dialect ┃\n" +
  "┠──────────────────┼──────────────┼──────────────┼──────────────┨\n" +
  "┃ delimiter        │       ','    │      '\\t'    │       ','    ┃\n" +
  "┃ quotechar        │       '\"'    │       '\"'    │       '\"'    ┃\n" +
  "┃ doublequote      │      True    │      True    │      True    ┃\n" +
  "┃ skipinitialspace │     False    │     False    │     False    ┃\n" +
  "┃ lineterminator   │    '\\r\\n'    │    '\\r\\n'    │      '\\n'    ┃\n" +
  "┃ quoting          │         0    │         0    │         1    ┃\n" +
  "┃ escapechar       │      None    │      None    │      None    ┃\n" +
  "┗━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━┛\n";

const DIAGRAM_10_A = 
  '+-----------+------------+------------+------------+\n' +
  '|           |    list    |    dict    |    set     |\n' +
  '+-----------+------------+------------+------------+\n';

const DIAGRAM_10_B = 
  '┏━━━━━━━━━━━┯━━━━━━━━━━━━┯━━━━━━━━━━━━┯━━━━━━━━━━━━┓\n' +
  '┃           │    list    │    dict    │    set     ┃\n' +
  '┠───────────┼────────────┼────────────┼────────────┨\n' +
  '┃ getitem() │ IndexError │  KeyError  │            ┃\n' +
  '┃ pop()     │ IndexError │  KeyError  │  KeyError  ┃\n' +
  '┃ remove()  │ ValueError │            │  KeyError  ┃\n' +
  '┃ index()   │ ValueError │            │            ┃\n' +
  '┗━━━━━━━━━━━┷━━━━━━━━━━━━┷━━━━━━━━━━━━┷━━━━━━━━━━━━┛\n';

const DIAGRAM_11_A =
  '+-----------+-------------+------+-------------+\n' +
  '| sampwidth |     min     | zero |     max     |\n' +
  '+-----------+-------------+------+-------------+\n';

const DIAGRAM_11_B =
  '┏━━━━━━━━━━━┯━━━━━━━━━━━━━┯━━━━━━┯━━━━━━━━━━━━━┓\n' +
  '┃ sampwidth │     min     │ zero │     max     ┃\n' +
  '┠───────────┼─────────────┼──────┼─────────────┨\n' +
  '┃     1     │           0 │  128 │         255 ┃\n' +
  '┃     2     │      -32768 │    0 │       32767 ┃\n' +
  '┃     3     │    -8388608 │    0 │     8388607 ┃\n' +
  '┃     4     │ -2147483648 │    0 │  2147483647 ┃\n' +
  '┗━━━━━━━━━━━┷━━━━━━━━━━━━━┷━━━━━━┷━━━━━━━━━━━━━┛\n';

const DIAGRAM_12_A =
  '+---------------+----------+----------+----------+----------+----------+\n';

const DIAGRAM_12_B =
  '┏━━━━━━━━━━━━━━━┯━━━━━━━━━━┯━━━━━━━━━━┯━━━━━━━━━━┯━━━━━━━━━━┯━━━━━━━━━━┓\n' +
  '┃               │ [ !#$%…] │ [a-zA-Z] │  [¼½¾…]  │  [²³¹…]  │  [0-9]   ┃\n' +
  '┠───────────────┼──────────┼──────────┼──────────┼──────────┼──────────┨\n' +
  '┃ isprintable() │    ✓     │    ✓     │    ✓     │    ✓     │    ✓     ┃\n' +
  '┃ isalnum()     │          │    ✓     │    ✓     │    ✓     │    ✓     ┃\n' +
  '┃ isnumeric()   │          │          │    ✓     │    ✓     │    ✓     ┃\n' +
  '┃ isdigit()     │          │          │          │    ✓     │    ✓     ┃\n' +
  '┃ isdecimal()   │          │          │          │          │    ✓     ┃\n' +
  '┗━━━━━━━━━━━━━━━┷━━━━━━━━━━┷━━━━━━━━━━┷━━━━━━━━━━┷━━━━━━━━━━┷━━━━━━━━━━┛\n';


// isFontAvailable:
(function(d){function c(c){b.style.fontFamily=c;e.appendChild(b);f=b.clientWidth;e.removeChild(b);return f}var f,e=d.body,b=d.createElement("span");b.innerHTML=Array(100).join("wi");b.style.cssText=["position:absolute","width:auto","font-size:128px","left:-99999px"].join(" !important;");var g=c("monospace"),h=c("serif"),k=c("sans-serif");window.isFontAvailable=function(b){return g!==c(b+",monospace")||k!==c(b+",sans-serif")||h!==c(b+",serif")}})(document);

if (isFontAvailable('Menlo')) {
  $(`code:contains(${DIAGRAM_1_A})`).html(DIAGRAM_1_B);
  $(`code:contains(${DIAGRAM_2_A})`).html(DIAGRAM_2_B);
  $(`code:contains(${DIAGRAM_3_A})`).html(DIAGRAM_3_B);
  $(`code:contains(${DIAGRAM_4_A})`).html(DIAGRAM_4_B);
  $(`code:contains(${DIAGRAM_5_A})`).html(DIAGRAM_5_B);
  $(`code:contains(${DIAGRAM_6_A})`).html(DIAGRAM_6_B);
  $(`code:contains(${DIAGRAM_7_A})`).html(DIAGRAM_7_B);
  $(`code:contains(${DIAGRAM_8_A})`).html(DIAGRAM_8_B);
  $(`code:contains(${DIAGRAM_9_A})`).html(DIAGRAM_9_B);
  $(`code:contains(${DIAGRAM_10_A})`).html(DIAGRAM_10_B);
  $(`code:contains(${DIAGRAM_11_A})`).html(DIAGRAM_11_B);
  $(`code:contains(${DIAGRAM_12_A})`).html(DIAGRAM_12_B);
}

var isMobile = false;
// Device detection:
if(/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|ipad|iris|kindle|Android|Silk|lge |maemo|midp|mmp|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows (ce|phone)|xda|xiino/i.test(navigator.userAgent) 
    || /1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i.test(navigator.userAgent.substr(0,4))) { 
    isMobile = true;
}

if (isMobile && window.screen.width < 768) {
  $(`code:contains(ToC)`).html(TOC_MOBILE);
}

// ===== Scroll to Top ==== 
$(window).scroll(function() {
  if (isMobile && $(this).scrollTop() >= 480) {  // If mobile device and page is scrolled more than 520px.
    $('#return-to-top').fadeIn(200);    // Fade in the arrow
  } else {
    $('#return-to-top').fadeOut(200);   // Else fade out the arrow
  }
});

$('#return-to-top').click(function() {  // When arrow is clicked
  $('body,html').animate({
    scrollTop : 0                       // Scroll to top of body
  }, 500);
});