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TERM=xterm-256color

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Where 0 is the Xvfb screen number:

DISPLAY=:0 import -window root screenshot.png

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#FP intro

Lambda calculus, Alonzo Church, '30

JS:

• functional: Lisp (1958, John McCarthy, fun) -> Scheme (1970, Guy L. Steele, fun) -> JS
• OO: Smalltalk (1972, Alan Kay, OO) -> Self (1987, David Ungar, OO, prototype) -> JS
• syntax, API: C -> Java -> JS

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Some practical examples of function composition, based on this article: https://medium.com/@chetcorcos/functional-programming-for-javascript-people-1915d8775504

const add1 = (a) => a + 1
const times2 = (a) => a * 2
const compose = (a, b) => (c) => a(b(c))
const add1OfTimes2 = compose(add1, times2)
add1OfTimes2(5) // => 11

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Example where functional style can simplify our lives.

Source: Dr. Venkat Subramaniam - Functional Programming with Java 8 (https://www.youtube.com/watch?v=Ee5t_EGjv0A)

Goal: calculate the double of the first even number greater than 3

var numbers = [1,2,3,4,5,6,7,8,9,10];

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0x9FFc43Aa32a63b838721b11a2D8d0f6cEE371F3a

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0x3430116FE481A92f0752FB7760B817e7E7c41492

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