Clojure - Simple projects - Encoding and decoding

Convert boolean true false to 1 and 0

A very simple example of encoding and decoding is converting the Clojure values of true and false to 1 and 0 respectively.

Using 1 for true and 0 for false has been a common idiom in programming languages, especially where a language did not include true and false syntax.

Define an association between values

Define a Clojure hash-map to associate the Clojure boolean true an false values to 1 and 0 respectively

{false 0
 true 1}

Find an associated value for the conversion

Using the get function the boolean-value is used to find a matching key in the map and if found the value that key is associated is returned.

(get {false 0 true 1} boolean-value)

Example:

(get {false 0 true 1} true)

A map can be called, just like a function. the boolean-value is passed to the map as a function argument. As with the get expression, if the map contains the key the associated value is returned.

({false 0 true 1} boolean-value)

Example:

({false 0 true 1} true)

Convert multiple boolean values

If there are a collection of boolean values to convert, the map function can be used to convert them all to 1 or 0.

Map this over a collection of values

(map {false 0 true 1} [collection-of-boolean-values])

Example:

(map {false 0 true 1} [true false false true true true false false true false true false false true])

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