6.s090First-Class Functions
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Consider the below program, separated into pieces. Indicate the value of the prompted expressions. If evaluating the expression would cause an error, write error in the box. If an expression is a function, write function in the box.
An environment diagram may be particularly helpful here.
def foo(x):
return x * x
first = foo
def foo(y, f):
return f(y + y)
a = first(3)
b = foo(5, first)
What's the value of a?
What's the value of b?
nums = [1, 5, 2, 4]
stats = {}
def foo(d, k, v):
d[k] = v(nums)
a = foo(stats, "total", sum)
b = foo(stats, "lo", min)
c = foo(stats, "hi", max)
d = [a, b, c]
What's the value of d?
What's the value of stats?
def exponent(x, y=2):
return x ** y
What's the value of exponent?
What's the value of y?
What's the value of exponent(6)?
What's the value of exponent(6, 0)?
What's the value of exponent(6, 0, 9)?
What's the value of exponent(y=2, x=3)?
Next Exercise: Dictionary Map