# Category:Forth

**Forth**

This

**programming language**may be used to instruct a computer to perform a task.

Garbage collected: | No |
---|---|

Typing: | Untyped |

See Also: |

**Forth** is a procedural, stack-oriented and reflective programming language without type checking which is also a concatenative programming language. Forth features both interactive execution of commands (making it suitable as a shell for systems that lack a more formal operating system) and the ability to compile sequences of commands for later execution; due to its ability to easily cross-compile a version of itself to other target architectures and because it does not need to rely on an underlying operating system, it is often used for embedded systems. Some Forth versions (especially early ones) compile concatenative threaded code, but many implementations today generate optimized machine code like other language compilers. While it has quite competitive performance on its own (comparable to Just-In-Time - JIT - compiled languages such as JavaScript, or those used on the Java Virtual Machine - JVM - such as Kotlin, or on DotNet such as C# or F#); however, if a particular application requires it, there is a closely integrated machine code Assembler that can be used to write the most time critical functions/"words" or to supply features not available in the standard language implementation.

Where not otherwise specified, examples conform to the 1994 ANSI Standard, also known as **ANS Forth**. Most Forth implementations now conform to this standard, often with system-specific extensions and convenience libraries. Some examples use words that are not in the standard, but which have become accepted as common practice since 1994. Standard words should be uppercase, but most Forth systems are case-insensitive.

## Citations

## Subcategories

This category has the following 2 subcategories, out of 2 total.

### @

- Forth Implementations (7 P)
- Forth User (50 P)

## Pages in category "Forth"

The following 200 pages are in this category, out of 600 total.

(previous page) (next page)### 2

### A

- A+B
- Abbreviations, simple
- ABC problem
- ABC words
- Abelian sandpile model
- Abstract type
- Abundant, deficient and perfect number classifications
- Accumulator factory
- Ackermann function
- Add a variable to a class instance at runtime
- Additive primes
- Address of a variable
- AKS test for primes
- Align columns
- Amicable pairs
- Angle difference between two bearings
- Anonymous recursion
- Anti-primes
- Apply a callback to an array
- Approximate equality
- Arbitrary-precision integers (included)
- Arithmetic-geometric mean
- Arithmetic/Complex
- Arithmetic/Integer
- Arithmetic/Rational
- Array concatenation
- Array length
- Arrays
- Ascending primes
- Assertions
- Associative array/Creation
- Associative array/Iteration
- Averages/Arithmetic mean
- Averages/Median
- Averages/Pythagorean means
- Averages/Root mean square
- Averages/Simple moving average

### B

- Babbage problem
- Balanced brackets
- Barnsley fern
- Base 16 numbers needing a to f
- Base64 decode data
- Base64 encode data
- Benford's law
- Binary coded decimal
- Binary digits
- Binary search
- Binary strings
- Bioinformatics/base count
- Bitmap
- Bitmap/Bresenham's line algorithm
- Bitmap/Flood fill
- Bitmap/Histogram
- Bitmap/Midpoint circle algorithm
- Bitmap/Read a PPM file
- Bitmap/Write a PPM file
- Bitwise IO
- Bitwise operations
- Boolean values
- Brazilian numbers
- Break OO privacy
- Bulls and cows

### C

- Caesar cipher
- Calculating the value of e
- Calkin-Wilf sequence
- Call a foreign-language function
- Call a function
- Call a function in a shared library
- Call an object method
- Cantor set
- Case-sensitivity of identifiers
- Catalan numbers
- Catamorphism
- Chaos game
- Character codes
- Check input device is a terminal
- Check that file exists
- Chinese remainder theorem
- Chinese zodiac
- Circular primes
- Classes
- Closures/Value capture
- Collections
- Colour bars/Display
- Comma quibbling
- Command-line arguments
- Comments
- Compare a list of strings
- Compare length of two strings
- Compile-time calculation
- Compiler/AST interpreter
- Compiler/code generator
- Compiler/lexical analyzer
- Compiler/syntax analyzer
- Compiler/virtual machine interpreter
- Compound data type
- Concurrent computing
- Conditional structures
- Constrained genericity
- Constrained random points on a circle
- Continued fraction
- Continued fraction/Arithmetic/Construct from rational number
- Convert decimal number to rational
- Convert seconds to compound duration
- Conway's Game of Life
- Copy a string
- Copy stdin to stdout
- Count in factors
- Count in octal
- Count occurrences of a substring
- Count the coins
- Cousin primes
- CRC-32
- Create a file
- Create a two-dimensional array at runtime
- Create an HTML table
- Create an object at a given address
- CSV data manipulation
- CSV to HTML translation
- Cuban primes
- Cumulative standard deviation
- Currying
- Cycle detection

### D

- Damm algorithm
- Date format
- Day of the week
- Define a primitive data type
- Delegates
- Delete a file
- Department numbers
- Descending primes
- Detect division by zero
- Determinant and permanent
- Determine if a string is numeric
- Dice game probabilities
- Digital root
- Dinesman's multiple-dwelling problem
- Disarium numbers
- Documentation
- Dot product
- Dragon curve
- Draw a clock
- Draw a cuboid
- Draw a pixel
- Draw a sphere
- Dutch national flag problem
- Dynamic variable names

### E

- Echo server
- Egyptian division
- Elementary cellular automaton
- Emirp primes
- Empty program
- Empty string
- Enforced immutability
- Entropy
- Enumerations
- Environment variables
- Erdős-primes
- Esthetic numbers
- Ethiopian multiplication
- Euler method
- Euler's identity
- Euler's sum of powers conjecture
- Evaluate binomial coefficients
- Even or odd
- Evolutionary algorithm
- Exceptions
- Execute a system command
- Execute Brain****
- Execute Computer/Zero
- Execute HQ9+
- Exponentiation operator
- Extend your language
- Extra primes
- Extract file extension
- Extreme floating point values

### F

- Factorial
- Factors of a Mersenne number
- Factors of an integer
- FASTA format
- Fibonacci n-step number sequences
- Fibonacci sequence
- File input/output
- File size
- Filter
- Find first and last set bit of a long integer
- Find limit of recursion
- Find prime n such that reversed n is also prime
- Find prime numbers of the form n*n*n+2
- Find square difference
- Find the missing permutation
- Find words which contains all the vowels
- Find words which contains more than 3 e vowels