note-transposer
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Music transposition made easy
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<a href="../index.html">all files</a> / <a href="index.html">note-transposer/</a> index.js
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">var parse = require('array-notation/pitch/parse')
var str = require('array-notation/pitch/str')
var operation = require('array-notation/operation')(parse, str)
/**
* Transpose a note by an interval.
*
* This function is currified. The order of the parameters is indifferent.
*
* @name note.transpose
* @function
* @param {String|Array} interval - the interval. If its false, the note is not
* transposed.
* @param {String|Array} note - the note to transpose
* @return {String|Array} the note transposed
*
* @example
* var transpose = require('note-transposer')
* transpose('3m', 'C4') // => 'Eb4'
* transpose('C4', '3m') // => 'Eb4'
* tranpose([1, 0, 2], [3, -1, 0]) // => [3, 0, 2]
* ['C', 'D', 'E'].map(transpose('3M')) // => ['E', 'F#', 'G#']
*/
var transpose = operation(function (i, n) {
if (i === false) return n
else if (!Array.isArray(i) || !Array.isArray(n)) return null
else if (i.length === 1 || n.length === 1) return [n[0] + i[0]]
var d = i.length === 2 && n.length === 2 ? <span class="branch-0 cbranch-no" title="branch not covered" >null </span>: n[2] || i[2]
return [n[0] + i[0], n[1] + i[1], d]
})
<span class="missing-if-branch" title="else path not taken" >E</span>if (typeof module === 'object' && module.exports) module.exports = transpose
<span class="missing-if-branch" title="if path not taken" >I</span>if (typeof window !== 'undefined') <span class="cstat-no" title="statement not covered" >window.transpose = transpose</span>
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