We use it a lot in our library for lazy getters. For this purposes we can use decorator from Taiga UI. There's one thing that we do not need and that is - recreating the Array everytime we request it. But then we will not be able to create them in *ngFor. If it was a static string value and not an input we could have changed Directive to instead of and get its value in constructor. Copy private get sequence ( ) : readonly ( 0 | 1 ) We will use it to send letter with mouse and virtual on-screen keyboard: This way we can type really fast and we'll never lose a letter in transition.įor the sake of a demo let's also make a simple service to send those sequences. Whenever a new value comes (a user presses a key) - it waits for the previous Observable to complete (a sequence is played out) before proceeding to create the next sequence Observable. It is a member of the Higher Order Observables family of operators and we use it to map every value to an Observable. Because we want to preserve the order of emissions and never lose a character from previous emission, we will use concatMap operator. It means that letters are translated into sequences that have duration. Let's make unit duration an InjectionToken as well so it can be customized! But since we emulate an analog device which is based on duration of signals - we will designate a certain length to every unit. Each letter would turn into an array of 0s and 1s instantly. We can encode every letter synchronously.
#Morse decoder javascript code#
And projects can swap it for their Morse code table: With second parameter having factory function we can provide this implementation as default value.
If we were to implement this code table in Angular, this would be a good candidate for an InjectionToken. This is a standard US Morse code table, but there are other versions. Dot is a single 1, which also should be separated with 0, so we'll have 4 of 1s and 3 zeros in between: 1010101. You can also see the signal grid, black square means 1, white square is 0. Words are separated by seven 0s (we can see this as space being four 0s + three 0s of char end)Įach letter is represented by the sequence depicted in the table below.We can use Boolean or just 1s and 0s for brevity. At every given piece it's either a "bleep" or silence. The signal is discrete, meaning it is broken into segments of a particular duration. It's pretty easy for us to understand as it is just a binary sequence. Using the above, I wrote a program in C# which does the above.Telegraph uses Morse code. If you wanted to get some meaningful messages out, then try looking for code meant to translate hashtags into readable language. If you wanted to prove the ambiguity, this would certainly do it. This will output all the possible combinations of letters and numbers without any spaces between "words". The MorseSolver again with the new strings) If they are valid add the translated character to textSoFarĪnd remove the characters from codeRemaining, then call Read 1 through (min of 5 or codeLength) characters from codeRemainingĬall an IsMorseCode method that checks if the characters If(codeRemaining length = 0) output textSoFar MorseSolver (string textSoFar, string codeRemaining) Method accepts two inputs one of the text so far translated, and the second of morse code. This is based on a few quick thoughts, so additional input would be welcome. Some pseudo-code for a solver that will give all possible interpretations. You easily get a FSA that defines the regular language of all Transition are chosen so that you mimic both the transducer $T$ and Regular languages, to the two finites states devices $T$ and $W$. What you really want is a FSA that recognizes (or generates) that language.įor that purpose, you can simply apply a standard cross-productĬonstruction, similar to the one used for the intersection of two That, since L is finite, hence regular, and since regular languagesĪre closed under GSM mappings, that the language $T(L)$ is regular. Since ⋅ represents E and − represents T, any Morse message without spaces can be interpreted as a string in $\=\mathcal L(W)$. Quoting David Richerby from the comments:
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