return values from functions

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Wed Apr 12 2023 00:20:59 GMT+0000 (Coordinated Universal Time)

Saved by @davidmchale #function #return #values #filtering

function betweenYears(yearStart, yearEnd){
    return function(number){
          if(number >= yearStart && number <= yearEnd){
              return number
          }
          return false
    }
}

const myYear = betweenYears(1900, 1999);
myYear(1978);

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@davidmchale

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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]

#function #return #values #filtering

return values from functions

function betweenYears(yearStart, yearEnd){
    return function(number){
          if(number >= yearStart && number <= yearEnd){
              return number
          }
          return false
    }
}

const myYear = betweenYears(1900, 1999);
myYear(1978);

#function #return #values #filtering

indexOf explantion

/** The indexOf() method
	Returns the position of the first occurrence of a value in a string.
	The indexOf() method returns -1 if the value is not found.
	The indexOf() method is case sensitive.
  */


function isValidPassword(password, username) {
	if (
		password.length < 8 ||
		password.indexOf(' ') !== -1 ||
		password.indexOf(username) !== -1
	) {
		return false;
	}
	return true;
}

/** or */


function isValidPassword(password, username) {
	const tooShort = password.length < 8;
	const hasSpace = password.indexOf(' ') !== -1;
	const tooSimilar = password.indexOf(username) !== -1;
	if (tooShort || hasSpace || tooSimilar) return false;
	return true;
}

#function #return #values #filtering

sorting basic

const prices = [400.50, 3000, 99.99, 35.99, 12.00, 9500];


// Sorting books by their rating: // use slice to copy the array
const acscendingsOrders = prices.slice().sort((a, b) => a.toFixed(2) - b.toFixed(2))
const descendingOrders = prices.slice().sort((a, b) => b.toFixed(2) - a.toFixed(2))

#laravel #php #filtering #search #eloquent

search and filtering

public function index(Travel $travel, ToursListRequest $request)
    {
        $tours = $travel->tours()
            ->when($request->priceFrom, function ($query) use ($request) {
                $query->where('price', '>=', $request->priceFrom * 100);
            })
            ->when($request->priceTo, function ($query) use ($request) {
                $query->where('price', '<=', $request->priceTo * 100);
            })
            ->when($request->dateFrom, function ($query) use ($request) {
                $query->where('starting_date', '>=', $request->dateFrom);
            })
            ->when($request->dateTo, function ($query) use ($request) {
                $query->where('starting_date', '<=', $request->dateTo);
            })
            ->when($request->sortBy, function ($query) use ($request) {
                if (! in_array($request->sortBy, ['price'])
                    || (! in_array($request->sortOrder, ['asc', 'desc']))) {
                    return;
                }

                $query->orderBy($request->sortBy, $request->sortOrder);
            })
            ->orderBy('starting_date')
            ->paginate();

        return TourResource::collection($tours);
    }

#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 #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

#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) -->';
}

return values from functions

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