Basic concepts

Values: Julia can work with different type of values like numbers, characters,

strings, so on. Below, we see an example of an string, numeric and complex value.

"Hello"

"Hello"

2 + 1im

2 + 1im

Variables: A value can be assigned to a variable using the equality symbol =.

Below, the variable greet is defined with the assigned value "Hello".

greet = "Hello"

"Hello"

Functions: A function is a mapping from a set of argument values to a return

value. There are different ways for defining a function. One common way is to start with the function key followed by the name of the function with braces, and it finish with the end key. The output value can be explicitly defined using the return key. See an example below.

function greet_name(x)
    out = "Hello, "  * x
    return out
end

greet_name (generic function with 1 method)

greet_name("Julia")

"Hello, Julia"

Printing: The most common function to print a text is print, while println has

the same behaviour but adds a newline at the end. We can use $ to interpolate the value of a variable. You can use braces for expressions (e.g. $(1 + 1)). In the example below, variables who and greet are interpolated in the printed text.

who = "Erick"
greet = "Hello"
println("Welcome! $greet, $(who)!")

Welcome! Hello, Erick!