Operator Type:
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Operator [other Operator type actions]
Query [operators of similar scope]
Query Boolean [other Query Boolean operators]
Baseline
The ampersand, &, is used in queries and conditional statements as a logical AND join. Thus:
if ($HasStock == true & $Price > 20) {$Badge="ok"}
The note's $Badge is only set if both the first and the second argument are true.
See also the OR join and conditional statements using multiple arguments.