Are there any differences between the following ways of initialization of variables? @var ||= [] @var = [] if @var.nil? @var = @var || [] Please share your way initializing a variable and state the pros & cons. ...
Comparing the terms "memoize" and "cache" and in reading Wikipedia's memoization entry, do people agree that using the term "memoize" implies The memoized result is kept in the process' memory; in other words, it isn't stored in memcached . One only "memoizes" functions, as in mathematical functions, e.g. Fibonacci, not values that may...
Beginner in JS :) needs an explanation of code piece from Crockford's book, section 4.15: var memoizer = function (memo, fundamental) { var shell = function (n) { var result = memo[n]; if (typeof result !== 'number') { result = fundamental(shell, n); memo[n] = result; } return ...
Hi, the problem is - Suppose you are given an mXn bitmap, represented by an array M[1..m,1.. n] whose entries are all 0 or 1. A all-one block is a subarray of the form M[i .. i0, j .. j0] in which every bit is equal to 1. Describe and analyze an efficient algorithm to find an all-one block in M with maximum area I am trying to make a ...
I'm trying to write a function that returns a memoized recursive function in Clojure, but I'm having trouble making the recursive function see its own memoized bindings. Is this because there is no var created? Also, why can't I use memoize on the local binding created with let? This slightly unusual Fibonacci sequence maker that starts...
I have a few functions in my code where it makes much sense (seems even mandatory) to use memoization. I don't want to implement that manually for every function separately. Is there some way (for example like in Python) I can just use an annotation or do something else so I get this automatically on those functions where I want it? ...
I can't figure out why m1 is apparently memoized while m2 is not in the following: m1 = ((filter odd [1..]) !!) m2 n = ((filter odd [1..]) !! n) m1 10000000 takes about 1.5 seconds on the first call, and a fraction of that on subsequent calls (presumably it caches the list), whereas m2 10000000 always takes the same amount of...
For example, the following code: class FoosController < ApplicationController def index if [email protected]? render :locals => {:bar => @foo} return else @foo = rand 10 render :locals => {:bar => @foo} end end end if I load localhost:3000/foos multiple times, it will show different values, and it is n...
I'm writing a class in python and I have an attribute that will take a relatively long time to compute, so I only want to do it once. Also, it will not be needed by every instance of the class, so I don't want to do it by default in __init__. I'm new to Python, but not to programming. I can come up with a way to do this pretty easil...