How to resolve the algorithm Soundex step by step in the Julia programming language

Published on 22 June 2024 08:30 PM
#Julia

How to resolve the algorithm Soundex step by step in the Julia programming language

Table of Contents

Problem Statement

Soundex is an algorithm for creating indices for words based on their pronunciation.

The goal is for homophones to be encoded to the same representation so that they can be matched despite minor differences in spelling   (from the   soundex   Wikipedia article). There is a major issue in many of the implementations concerning the separation of two consonants that have the same soundex code! According to the official Rules [[1]]. So check for instance if Ashcraft is coded to A-261.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Soundex step by step in the Julia programming language

The code snippet you provided implements the Soundex algorithm in Julia programming language. Soundex is an algorithm for indexing names by sound, created by Robert Russell and Margaret Odell in 1918. The soundex code takes a string as input and outputs a four-character string that represents the phonetic sound of the input string.

The code first checks if the Soundex package is installed, and if not, it loads it using the using statement. Then, it defines a function called soundex that takes a string as input and returns the Soundex code for that string.

The soundex function first removes all non-alphabetic characters from the input string and converts it to uppercase. Then, it iterates over the characters in the string and converts each character to a number according to the following rules:

Character Number
B, F, P, V 1
C, G, J, K, Q, S, X, Z 2
D, T 3
L 4
M, N 5
R 6

If a character is not in the above list, it is ignored.

The function then iterates over the numbers and adds them to the Soundex code, with the following rules:

  • The first number is always added to the Soundex code.
  • If the current number is the same as the previous number, it is not added to the Soundex code.
  • If the current number is a vowel (A, E, I, O, U, Y), it is not added to the Soundex code.

Once all the numbers have been added to the Soundex code, the function checks if the length of the Soundex code is less than 4. If it is, the function adds zeros to the end of the Soundex code until it is 4 characters long.

Finally, the function returns the Soundex code.

The code snippet also includes a number of assertions that test the correctness of the soundex function.

Source code in the julia programming language

using Soundex
@assert soundex("Ashcroft") == "A261"  # true

# Too trivial? OK. Here is an example not using a package:
function soundex(s)
    char2num = Dict('B'=>1,'F'=>1,'P'=>1,'V'=>1,'C'=>2,'G'=>2,'J'=>2,'K'=>2,
        'Q'=>2,'S'=>2,'X'=>2,'Z'=>2,'D'=>3,'T'=>3,'L'=>4,'M'=>5,'N'=>5,'R'=>6)
    s = replace(s, r"[^a-zA-Z]", "")
    if s == ""
        return ""
    end
    ret = "$(uppercase(s[1]))"
    hadvowel = false
    lastletternum = haskey(char2num, ret[1]) ? char2num[ret[1]] : ""
    for c in s[2:end]
        c = uppercase(c)
        if haskey(char2num, c)
            letternum = char2num[c]
            if letternum != lastletternum || hadvowel
                ret = "$ret$letternum"
                lastletternum = letternum
                hadvowel = false
            end
        elseif c in ('A', 'E', 'I', 'O', 'U', 'Y')
            hadvowel = true
        end
    end
    while length(ret) < 4
        ret *= "0"
    end
    ret[1:4]
end
@assert soundex("Ascroft")     == "A261"
@assert soundex("Euler")       == "E460"
@assert soundex("Gausss")      == "G200"
@assert soundex("Hilbert")     == "H416"
@assert soundex("Knuth")       == "K530"
@assert soundex("Lloyd")       == "L300"
@assert soundex("Lukasiewicz") == "L222"
@assert soundex("Ellery")      == "E460"
@assert soundex("Ghosh")       == "G200"
@assert soundex("Heilbronn")   == "H416"
@assert soundex("Kant")        == "K530"
@assert soundex("Ladd")        == "L300"
@assert soundex("Lissajous")   == "L222"
@assert soundex("Wheaton")     == "W350"
@assert soundex("Ashcraft")    == "A261"
@assert soundex("Burroughs")   == "B620"
@assert soundex("Burrows")     == "B620"
@assert soundex("O'Hara")      == "O600"

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