Hello Julia: Learn the New Julia Programming Language

Take a quick tour of julialang.org, the Julia site, highlighting the docs, modules, packages, blog, community, learning, teaching, publications, and Julia Kahn as the go-to resources for language information.

Discover how to declare and use variables in Julia, including numbers, strings, and unicode-based identifiers via backslash input, and learn about the ANS variable and other naming conventions.

Explore strings in Julia, using one-based indexing and single quotes for characters. Learn concatenation, printing, and interpolation with $ and parentheses to compute inside strings.

Explore arrays in Julia, using 1-based indexing to access and modify elements, build 1d and 2d arrays, perform element-wise addition and multiplication, and select rows or columns with colon notation.

Explore how Julia functions work: define with the function keyword or shorthand, pass parameters, return values, and treat functions as values, using examples like sqrt(25) and sort.

Explore returning values from functions with the return keyword, including conditional returns in a daily interest calculator; use anonymous functions, map, and keyword arguments with defaults in Julia.

Define functions with a variable number of arguments using ellipses and explore function signatures; apply map to square inputs; build a planet weight calculator and a credit card interest calculator.

Discover Julia's dynamic type system using typeof to inspect values and trace subtypes through the hierarchy. Declare custom types with the type keyword; define a person with ASCII string fields.

Explore dictionaries in Julia by declaring and updating key–value pairs, accessing values by key, and using has key and in functions to check presence, plus building empty dictionaries.

Explore how loops work in Julia by iterating through arrays and dictionaries with for loops, and control flow with while loops and conditional logic.

Explore list comprehensions in Julia by transforming and filtering arrays with for-like syntax, including squaring numbers, applying conditions, and using filters for even elements, paralleling map usage.

Understand bearable scope in Julia by examining global scope, function scope, and block scope, and see how variables like A, X, and gamma behave inside and outside their defining blocks.

Practice file I/O, reading and writing files, and working with directories in part two of the Julia course. Explore error handling, exception handling, and multiple dispatch.

Change directories with cd to build paths and access files, join paths, read contents, and inspect file statistics with the stat command.

Explore macros as the gateway to metaprogramming in Julia, using time, show, and line to inspect performance, trace code execution, and pinpoint source locations across modules.

Explore Julia metaprogramming by examining expressions and symbols, parsing strings into expressions, and constructing symbol-based computations to understand how Julia compiles and executes code.

Learn how to use constants and typing to improve Julia performance, especially for global variables. Explore time macro timing and the impact of initial compilation versus subsequent runs.

Demonstrate exception handling and robust error management in Julia by using try-catch, domain errors, and custom messages, while validating user input and logging failures to prevent crashes.

Explore advanced exception handling in Julia by using inline try catch blocks, handling errors and warnings, and applying finally to ensure files are closed and cleanup after failures.

Explore multiple dispatch in Julia by defining a generic function with multiple methods, testing signatures from numbers to strings, and using the which macro to reveal the dispatched method.

Explore Julia programming language fundamentals, from syntax to what Julia can do at a basic level, then master file i/o, error handling, and multiple dispatch with performance tips.