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<h1>Why local variables are called "let"</h1>
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<time datetime="2022-01-10T00:00:00-08:00">2022 Jan 10 PST</time>
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- <span aria-hidden="true" style="font-style:italic">Revision as of: </span> <time datetime="2024-02-02T00:00:00-08:00" aria-label="Revision">2024 Feb 2 PST</time>
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<p>In JavaScript there are 3 different kinds of variables, global variables(using <code>var</code>), constants(<code>const</code>, and local variables<code>let</code>). All of the act a little differently from each other. Allow me to explain what they do.</p>
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<p>Global variables, made using <code>var</code>, are as they sound, global variables. Once defined, they can be used, edited, or redefined anywhere.</p>
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<p>Constants, defined with <code>const</code>, are constant, they cannot change, at all.</p>
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<p>Local variables, defined with <code>let</code>, are variables that can only be used in the place that it is defined, like a function, and it's children.</p>
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<p>Now that we has that established, <em>let</em>'s talk about how local variables got their name.</p>
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<p>Turns out "let" is a mathematical term.</p>
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<blockquote>
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<p>The <strong>"let" expression</strong> may also be defined in mathematics, where it associates a Boolean condition with a restricted scope.
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<cite>Quote from <a href="https://en.wikipedia.org/w/index.php?title=Let_expression&oldid=1187985658">Wikipedia "Let expression"</a> as of <time>2024 Feb 2</time></cite></p>
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<p>It was first used in programming in early languages like Basic.</p>
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<p>In case you're wondering, the main source is an answer on Stack Overflow: <em>"Why was the name 'let' chosen for block-scoped variable declarations in JavaScript?"</em>, answer by <a href="https://stackoverflow.com/users/1968972">exebook</a>, edited by <a href="https://stackoverflow.com/users/1741346">Pikamander2</a>; <a href="https://stackoverflow.com/a/37917071">link</a>.</p>
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