IDL

IDL, aka Interactive Data Language, is a programming language created in 1977 by David Stern.

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IDL, short for Interactive Data Language, is a programming language used for data analysis. It is popular in particular areas of science, such as astronomy, atmospheric physics and medical imaging. IDL shares a common syntax with PV-Wave and originated from the same codebase, though the languages have subsequently diverged in detail. Read more on Wikipedia...

IDL website
IDL Wikipedia page
IDL docs
There are at least 2,337 IDL repos on GitHub
IDL first developed in L3Harris Geospatial Solutions, Inc
file extensions for IDL include pro and dlm
The Google BigQuery Public Dataset GitHub snapshot shows 5k users using IDL in 5k repos on GitHub
Explore IDL snippets on Rosetta Code
IDL on HOPL
IDL appears in the TIOBE Index
ANTLR grammar for IDL
CodeMirror package for syntax highlighting IDL
Pygments supports syntax highlighting for IDL
GitHub supports syntax highlighting for IDL
There is 1 Jupyter Kernel for IDL
See also: (11 related languages)GNU Data Language, PV-Wave, Fortran, C, Unix, Smalltalk, MATLAB, NumPy, Python, Perl Data Language, Perl
Read more about IDL on the web: 1.

Example from hello-world:

print, "Hello World"
end

Example from the Hello World Collection:

IDL> ; Hello World in IDL (Interactive Data Language)
IDL> print, "Hello World"

Example from Linguist:

MODULE mg_analysis
DESCRIPTION Tools for analysis
VERSION 1.0
SOURCE mgalloy
BUILD_DATE January 18, 2011

FUNCTION MG_ARRAY_EQUAL      2 2 KEYWORDS
FUNCTION MG_TOTAL            1 1

Feature	Supported	Token	Example
Integers	✓
Floats	✓
Hexadecimals	✓
Octals	✓
Strings	✓	"	"Hello world"
Print() Debugging	✓	print
Comments	✓
Semantic Indentation	X

IDL - Programming language

Language features