61 lines
1.8 KiB
JavaScript
61 lines
1.8 KiB
JavaScript
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/**
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* Performs a strict shallow diff on the values of two arrays
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*
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* Copyright (C) 2017 LoVullo Associates, Inc.
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*
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* This file is part of the Liza Data Collection Framework.
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*
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* liza is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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var Class = require( 'easejs' ).Class,
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ArrayDiff = require( './ArrayDiff' );
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module.exports = Class( 'ShallowArrayDiff' )
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.implement( ArrayDiff )
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.extend(
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{
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/**
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* Return the strictly non-matching indexes and their values
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*
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* The returned array will set the value of the associated changed index to
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* an array containing both values of a and b respectively; unchanged
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* indexes will be undefined.
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*
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* @param {Array} a first array to compare
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* @param {Array} b second array to compare
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*
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* @return {Array.Array.<*>} an array of non-matching values
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*/
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'public diff': function( a, b )
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{
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var longer = ( a.length > b.length ) ? a : b,
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i = longer.length,
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changed = [];
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// for each index, return both values if they do not strictly match
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while ( i-- )
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{
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if ( a[ i ] !== b[ i ] )
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{
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changed[ i ] = [ a[ i ], b[ i ] ];
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}
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}
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return changed;
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}
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} );
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