First Semester in Numerical Analysis with Julia, 2020a

CHAPTER 1. INTRODUCTION 20
In [37]: iseven(5)
Out[37]: false
In [38]: isodd(5)
Out[38]: true
Defining functions
There are three ways to define a function. Here is the basic syntax:
In [39]: function squareit(x)
return x^2
end
Out[39]: squareit (generic function with 1 method)
In [40]: squareit(3)
Out[40]: 9
There is also a compact form to define a function, if the body of the function is a
short, simple expression:
In [41]: cubeit(x)=x^3
Out[41]: cubeit (generic function with 1 method)
In [42]: cubeit(5)
Out[42]: 125
Functions can be defined without being given a name: these are called anonymous
functions:
In [43]: x-> x^3
Out[43]: #5 (generic function with 1 method)