Tips on functional progrmaming

In [2]:

    

# Original 
x = 20
if(x > 1):
    print("True:", x)

# eleminating if
x  = 20
a = (x > 1 and ("True: " + str(x)))
print(a)


    

    




True: 20
True: 20

In [4]:

    

# Eleminating if else
x = 10
if (x > 1):
    print("True:", x)
else:
    print("False:", x)


    

    




True: 10

In [8]:

    

x  = -20
a = (x > 1 and ("True:", str(x))) or ("False:", str(x))
print(a)
print(" ".join(a))


    

    




('False:', '-20')
False: -20

In [9]:

    

x  = 20
a = (x > 1 and ("true " + str(x))) or ("false " + str(x))
print(a)


    

    




true 20

In [10]:

    

x  = -20
a = (x > 1 and ("true " + str(x))) or ("false " + str(x))
print(a)


    

    




false -20

In [14]:

    

x  = -20
a = x > 1 and x or x*x
print(a)


    

    




400

In [ ]:

    

AND
0 0 0 
0 1 0
1 0 0
1 1 1 

or
0 0 0 
0 1 1 
1 0 1
1 1 1


    

In [20]:

    

x = 0
if (x == 0):
    print("False")
elif (x == 1):
    print("True")
else:
    print("Not boolean")
    
print("*"*11)

a = (x == 0 and "False") or ((x == 1 and "True") or "Not Boolean") 
print(a)


    

    




False
***********
False

In [18]:

    

# Eleminating if elif else
x = 1
if (x == 0):
    print("False")
elif (x == 1):
    print("True")
else:
    print("Not boolean")
    
print("*"*11)

a = (x == 0 and "False") or ((x == 1 and "True") or "Not Boolean") 
print(a)


    

    




True
***********
True

In [21]:

    

x = 12
if (x == 0):
    print("False")
elif (x == 1):
    print("True")
else:
    print("Not boolean")
    
print("*"*11)

a = (x == 0 and "False") or ((x == 1 and "True") or "Not Boolean") 
print(a)


    

    




Not boolean
***********
Not Boolean

In [12]:

    

# Eliminating Sequential Statement
def double(x):
    return(x+x)

d = []
for x in range(20):
    d.append(double(x))
print(d)
    
# Using import map
print("*"*75)
d = list(map(double, range(20)))
print(d)


    

    




[0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38]
***************************************************************************
[0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38]

In [22]:

    

# Eliminating While Statement
def double(x):
    return(x+x)
x = 1
d = []

while x < 20:
    d.append(double(x))
    x = x + 1
    
print(d)

### !!! TODO !!!
##  while_FP = lambda: (<cond> and while_block()) or while_FP()


    

    




[2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38]