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Id
17343656
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0
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0
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1
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CreationDate
2013-06-27T12:50:22.677
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0
LastActivityDate
2014-03-02T11:10:24.477
LastEditDate
2014-03-02T11:10:24.477
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192740
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2075630
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12058717
PostTypeId
2
Score
3
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0
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text
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Just as addition, the differences between those commands have increased due to the introduction of lexical binding, though those differences will not really be relevant if you just want to customize some variables. The <code>def...</code> constructs declare global variables. The <code>set...</code> functions set variables, whether global or local. When <code>x</code> is neither a local variable (a formal parameter of the current function or declared by a <code>let</code> form or similiar) nor defined by a <code>def...</code> form and you write <code>(setq x 0)</code> the byte compiler will even show a warning <pre><code>Warning: assignment to free variable `x' </code></pre> Variables declared with <code>defvar</code>, <code>defcustom</code>, <code>defconst</code> are dynamically bound, i.e. when you have a construct <pre><code>(let ((lisp-indent-offset 2)) (pp (some-function))) </code></pre> the function <code>some-function</code> will see the change of the global variable <code>lisp-indent-offset</code>. When a variable is not dynamically bound, in something like <pre><code>(let ((my-local-var 1)) (some-function)) </code></pre> where <code>my-local-var</code> has no global value, then <code>some-function</code> will not see the assigned value, as it is lexically scoped. On the other hand, dynamically scoped variables will not be captured into lexical closures. More details can be seen in <a href="http://www.gnu.org/software/emacs/manual/html_node/elisp/Lexical-Binding.html" rel="nofollow">http://www.gnu.org/software/emacs/manual/html_node/elisp/Lexical-Binding.html</a>
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1. POConfusing about the Emacs custom system
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1. UScstork
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1. COFor clarity, unless lexical binding is *explicitly enabled* for a file, all variables will be dynamically bound, regardless of how they are defined and set.
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