// wink-nlp-utils
// NLP Functions for amplifying negations, managing elisions,
// creating ngrams, stems, phonetic codes to tokens and more.
//
// Copyright (C) GRAYPE Systems Private Limited
//
// This file is part of “wink-nlp-utils”.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// DEALINGS IN THE SOFTWARE.
//
// ## tokens
// ### bigrams
/**
*
* Generates bigrams from the input tokens.
*
* @alias tokens#bigrams
* @param {string[]} tokens the input tokens.
* @return {string[]} the bigrams.
* @example
* bigrams( [ 'he', 'acted', 'decisively', 'today' ] );
* // -> [ [ 'he', 'acted' ],
* // [ 'acted', 'decisively' ],
* // [ 'decisively', 'today' ] ]
*/
var bigrams = function ( tokens ) {
// Bigrams will be stored here.
var bgs = [];
// Helper variables.
var i, imax;
// Create bigrams.
for ( i = 0, imax = tokens.length - 1; i < imax; i += 1 ) {
bgs.push( [ tokens[ i ], tokens[ i + 1 ] ] );
}
return bgs;
}; // bigrams()
module.exports = bigrams;
