index.js

/**
* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*    http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

'use strict';

var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
var take = require( '@stdlib/array/take' );
var tabulateBy = require( './../lib' );

var vals;
var indices;
var arr;
var out;

function indicator( value ) {
	return value[ 0 ];
}

vals = [ 'beep', 'boop', 'foo', 'bar', 'woot', 'woot' ];

// Generate a list of random indices:
indices = discreteUniform( 100, 0, vals.length - 1 );

// Create a random collection by picking elements at the generated indices:
arr = take( vals, indices );

// Generate a frequency table:
out = tabulateBy( arr, indicator );
console.log( out );