📦primary expression
the simplest expressions. (literal, keyword, variable, global object property)
JS ⟩ statement ⟩ expression ⟩ primary
an expression that doesn't include any simpler expressions, they are：
primiary expressions (listed in MDN)
this - property of execution context (environment record, actually).
function - defines a function expression.
class - defines a class expression.
function*defines a generator function expression.yieldpause and resume a generator function.yield*delegate to another generator function or iterable object.async functiondefines an async function expression.await - wait for the promise's future value.
async function*define an async generator function expression./ab+c/iregular expression literal syntax.( )grouping operator.
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