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mk2s's solution

to Scrabble Score in the CFML Track

Published at Feb 26 2019 · 0 comments
Instructions
Test suite
Solution

Given a word, compute the scrabble score for that word.

Letter Values

You'll need these:

``````Letter                           Value
A, E, I, O, U, L, N, R, S, T       1
D, G                               2
B, C, M, P                         3
F, H, V, W, Y                      4
K                                  5
J, X                               8
Q, Z                               10
``````

Examples

"cabbage" should be scored as worth 14 points:

• 3 points for C
• 1 point for A, twice
• 3 points for B, twice
• 2 points for G
• 1 point for E

And to total:

• `3 + 2*1 + 2*3 + 2 + 1`
• = `3 + 2 + 6 + 3`
• = `5 + 9`
• = 14

Extensions

• You can play a double or a triple letter.
• You can play a double or a triple word.

To run the code in this exercise, you will only need to have CommandBox CLI installed. This binary runs CFML code from the command line.

To run the tests, `cd` into the exercise folder and run the following:

``````box task run TestRunner
# Or start up a test watcher that will rerun when files change
``````

The tests leverage a library called TestBox which supports xUnit and BDD style of testing. All test suites will be written in the BDD style which uses closures to define test specs. You won't need to worry about installing TestBox. The CLI test runner will take care of that for you. You just need to be connected to the internet the first time you run it. You can read more about it here:

https://testbox.ortusbooks.com/content/

Source

Inspired by the Extreme Startup game https://github.com/rchatley/extreme_startup

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.

ScrabbleScoreTest.cfc

``````component extends="testbox.system.BaseSpec" {

function beforeAll(){
SUT = createObject( 'ScrabbleScore' );
}

function run(){

describe( "My ScrabbleScore class", function(){

it( 'lowercase letter', function(){
expect( SUT.score( word='a' ) ).toBe( '1' );
});

it( 'uppercase letter', function(){
expect( SUT.score( word='A' ) ).toBe( '1' );
});

it( 'valuable letter', function(){
expect( SUT.score( word='f' ) ).toBe( '4' );
});

it( 'short word', function(){
expect( SUT.score( word='at' ) ).toBe( '2' );
});

it( 'short, valuable word', function(){
expect( SUT.score( word='zoo' ) ).toBe( '12' );
});

it( 'medium word', function(){
expect( SUT.score( word='street' ) ).toBe( '6' );
});

it( 'medium, valuable word', function(){
expect( SUT.score( word='quirky' ) ).toBe( '22' );
});

it( 'long, mixed-case word', function(){
expect( SUT.score( word='OxyphenButazone' ) ).toBe( '41' );
});

it( 'english-like word', function(){
expect( SUT.score( word='pinata' ) ).toBe( '8' );
});

it( 'empty input', function(){
expect( SUT.score( word='' ) ).toBe( '0' );
});

it( 'entire alphabet available', function(){
expect( SUT.score( word='abcdefghijklmnopqrstuvwxyz' ) ).toBe( '87' );
});

});

}

}``````

SolutionTest.cfc

``````component extends="ScrabbleScoreTest" {

function beforeAll(){
SUT = createObject( 'Solution' );
}

}``````
``````/**
* Your implmentation of the ScrabbleScore exercise
*/
component {

/**
* function to convert a letter to it's point value
*
**/
private function letterToPoint(letter) {
if (structKeyExists(letterToScore, letter)) {
return letterToScore[letter];
} else {
return 0;
}
}

/**
* function for reducing an array of integers to it's sum
*
**/
private function sum(prev, next) {
return prev+next;
}

/**
* @returns integer representing the total score of given word
* @arg string word
*/
function score( word ) {

letterToScore = {
"A"=1, "E"=1, "I"=1, "O"=1, "U"=1, "L"=1, "N"=1, "R"=1, "S"=1, "T"=1,
"D"=2, "G"=2,
"B"=3, "C"=3, "M"=3, "P"=3,
"F"=4, "H"=4, "V"=4, "W"=4, "Y"=4,
"K"=5,
"J"=8, "X"=8,
"Q"=10, "Z"=10
}

var words = word.listToArray("");
return arrayMap(words, letterToPoint)
.reduce(sum, 0);
}

}``````