Function composition with reduce

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Sat Feb 12 2022 14:41:52 GMT+0000 (UTC)

Saved by @dickosmad #function #composition

// Les briques de base que nous allons composer
const double = x => x + x;
const triple = x => 3 * x;
const quadruple = x => 4 * x;

// Une fonction qui permet d'appliquer une composition
const pipe = (...functions) => input => functions.reduce(
    (acc, fn) => fn(acc),
    input
);

// On crée des fonctions pour multiplier par un facteur donné
const multiply6 = pipe(double, triple);
const multiply9 = pipe(triple, triple);
const multiply16 = pipe(quadruple, quadruple);
const multiply24 = pipe(double, triple, quadruple);

// Utilisation
multiply6(6); // 36
multiply9(9); // 81
multiply16(16); // 256
multiply24(10); // 240

COPY

https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce

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#python #python #strings #vowels #function

Get vowels in strings

This method gets vowels (‘a’, ‘e’, ‘i’, ‘o’, ‘u’) found in a string.
   
#make a function:
def get_vowels(string):

#return is the keyword which means function have to return value: 
 return [each for each in string if each in 'aeiou']


#assign the words and function will return vowels words.
get_vowels('foobar') # ['o', 'o', 'a']


get_vowels('gym') # []

#python #function

Python when function - to apply a function when predicate(x) is True

def when(predicate, when_true):
  return lambda x: when_true(x) if predicate(x) else x
  
EXAMPLES
double_even_numbers = when(lambda x: x % 2 == 0, lambda x : x * 2)
double_even_numbers(2) # 4
double_even_numbers(1) # 1

#python #lists #function

Build a list using an iterator Python unfold function

def unfold(fn, seed):
  def fn_generator(val):
    while True: 
      val = fn(val[1])
      if val == False: break
      yield val[0]
  return [i for i in fn_generator([None, seed])]
  
  
EXAMPLES
f = lambda n: False if n > 50 else [-n, n + 10]
unfold(f, 10) # [-10, -20, -30, -40, -50]

#python #python #function #composition

Performs right-to-left function composition.

Use functools.reduce() to perform right-to-left function composition. The last (rightmost) function can accept one or more arguments; the remaining functions must be unary.
from functools import reduce

1.def compose(*fns):
  2.return reduce(lambda f, g: lambda *args: f(g(*args)), fns)
EXAMPLES
add5 = lambda x: x + 5
multiply = lambda x, y: x * y
multiply_and_add_5 = compose(add5, multiply)

multiply_and_add_5(5, 2) # 15

#function #composition

Function composition with reduce

// Les briques de base que nous allons composer
const double = x => x + x;
const triple = x => 3 * x;
const quadruple = x => 4 * x;

// Une fonction qui permet d'appliquer une composition
const pipe = (...functions) => input => functions.reduce(
    (acc, fn) => fn(acc),
    input
);

// On crée des fonctions pour multiplier par un facteur donné
const multiply6 = pipe(double, triple);
const multiply9 = pipe(triple, triple);
const multiply16 = pipe(quadruple, quadruple);
const multiply24 = pipe(double, triple, quadruple);

// Utilisation
multiply6(6); // 36
multiply9(9); // 81
multiply16(16); // 256
multiply24(10); // 240

#python #function

Python compose function - performs right-to-left function composition

from functools import reduce

def compose(*fns):
  return reduce(lambda f, g: lambda *args: f(g(*args)), fns)


EXAMPLES
add5 = lambda x: x + 5
multiply = lambda x, y: x * y
multiply_and_add_5 = compose(add5, multiply)

multiply_and_add_5(5, 2) # 15

#python #function #returnfunction

How to use of “return” keyword in a function

#define a function 
 1.Def cube(num)
      #write the formula of cube
      2.return num*num*num
     #give the number to calculate the cube 
     3.cube(3)
   # print the cube of that number simply by using print command
    4.print(cube(3))
     5.“return” keyword means that function have to return value

#python #python #function #return #allunique

All unique

#define function
defall_unique(lst):

   return len(lst) == len(set(lst))
   
x = [1,1,2,2,3,2,3,4,5,6]


y = [1,2,3,4,5]


all_unique(x) # False
all_unique(y) # True

#python #function #python #def

How to define function - by using keyword def

 # give a name of function after def
 1.def sayhi():
      #put the statement in the function  
     2.print(“hello world”)
#call function by name:
3.sayhi()


Output: 
Hello world

#python #python #function #return

How to use of “return” keyword in a function?

#define a function 
 Def cube(num)
      #write the formula of cube
      return num*num*num
     #give the number to calculate the cube 
     cube(3)
   # print the cube of that number simply by using print command
    print(cube(3))
     “return” keyword means that function have to return          value

#python #python #function #bytesize #return

How to find byte size?

def byte_size(string):

  return(len(string.encode('utf-8')))

byte_size('😀’) # 4
byte_size('Hello World') # 11

#wordpress #google #tag #manager #function

WordPress add Google tag manager by function

add_action( 'wp_body_open', 'wpdoc_add_custom_body_open_code' );
 
function wpdoc_add_custom_body_open_code() {
    echo '<!-- Google Tag Manager (noscript) --> ... <!-- End Google Tag Manager (noscript) -->';
}

#textpreprocessing #nlp #pandas #function

replace function in dataframe

for c in df_drop.columns:
    df_drop[c] = df_drop[c].str.replace('[^\w\s]+', '')
df_drop = df_drop.astype(str)
df_drop.head()

#textpreprocessing #nlp #function #pandas

apply function and def

rmsval = df.loc[:, 'c1':'c4']
def getrms(row):  
  a = np.sqrt(sum(row**2/4))
  return a
df['rms'] = df.apply(getrms,axis=1)
df.head()

#resize #jquery #function

was SUPPOSED to be a resize function. Useless, but just saving it.

const textBlock = 0.37645448;
  const pageWidth = $('.container').width();
  const pageHeight = $('.container').height();
	
  if (pageWidth <= 1920 && pageHeight <= 1080) {
    $('.container').css()
  } else {
    $('.container').css('max-width', '100%')
  }

Function composition with reduce

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