Re: understanding lambda

On Jun 16, 3:52 pm, Jerry Stuckle <jstuck...@xxxxxxxxxxxxx> wrote:
lawpoop wrote:
Trying to wrap my head around the lambda concept.

I saw this example on the php website:

$func = function($value) { return $value * 2; };
print_r(array_map($func, range(1, 5)));

Which led me to conclude this definition

"A lambda function is a function whose name is a variable, rather than
a hard-coded string."

Is this correct?

Not quite.  A lambda function is one you create on the fly, as in your
first statement.  The function doesn't have to be created on the fly to
be callable via a variable (your second statement).

Thanks, Jerry.

Can you give a more formal definition of "created on the fly" ?

If I write

function test_function() {
return ;
}

Why wouldn't ( or would ) that be "created on the fly"?

What are other ways you can call a function via a variable?
.

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