#python #sicp
The sqrt_update function carries with it some data: the value for a referenced in the environment in which it was defined. Because they "enclose"
information in this way, locally defined functions are often called closures.
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1.6 Higher-Order Functionsr than the
global environment.
A local function can access the environment of the enclosing function,
because the body of the local function is evaluated in an environment that
extends the evaluation environment in which it was defined.
<span>The sqrt_update function carries with it some data: the value for a
referenced in the environment in which it was defined. Because they "enclose"
information in this way, locally defined functions are often called closures.
1.6.4 Functions as Returned Values
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whose returned values are themselves funct Summary
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