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* @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';
// MODULES //
var setReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
var isArrayLike = require( '@stdlib/assert/is-array-like' );
var isTypedArrayLike = require( '@stdlib/assert/is-typed-array-like' );
var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var format = require( '@stdlib/string/format' );
var randu = require( '@stdlib/random/base/mt19937' ).factory;
var copy = require( '@stdlib/utils/copy' );
var discreteUniform = require( './discrete_uniform.js' );
var renormalizing = require( './renormalizing.js' );
var fisherYates = require( './fisher_yates.js' );
var vose = require( './vose.js' );
var defaults = require( './defaults.json' );
var validate = require( './validate.js' );
// FUNCTIONS //
var slice = Array.prototype.slice;
// MAIN //
/**
* Returns a function to sample elements from an array-like object.
*
* @param {(ArrayLike|TypedArrayLike)} [pool] - array-like object from which to sample
* @param {Options} [options] - function options
* @param {PositiveInteger} [options.seed] - integer-valued seed
* @param {NonNegativeInteger} [options.size] - sample size
* @param {boolean} [options.replace=true] - boolean indicating whether to sample with replacement
* @param {boolean} [options.mutate=false] - boolean indicating whether to mutate the `pool` when sampling without replacement
* @throws {TypeError} `pool` must be an array-like object
* @throws {TypeError} options argument must be an object
* @throws {TypeError} must provide valid options
* @returns {Function} function to sample elements from an array-like object
*
* @example
* var sample = factory({
* 'seed': 232
* });
* var out = sample( 'abcdefg' );
* // e.g., returns [ 'g', 'd', 'g', 'f', 'c', 'e', 'f' ]
*
* @example
* var sample = factory( [ 1, 2, 3, 4, 5, 6 ], {
* 'seed': 232,
* 'size': 2
* });
* var out = sample();
* // e.g., returns [ 6, 4 ]
*
* out = sample();
* // e.g., returns [ 6, 5 ]
*
* @example
* var sample = factory( [ 1, 2, 3, 4, 5, 6 ], {
* 'seed': 474,
* 'size': 3,
* 'mutate': true,
* 'replace': false
* });
* var out = sample();
* // e.g., returns [ 4, 3, 6 ]
*
* out = sample();
* // e.g., returns [ 1, 5, 2 ]
*
* out = sample();
* // returns null
*
* @example
* var sample = factory( [ 0, 1 ], {
* 'size': 2
* });
*
* var out = sample();
* // e.g., returns [ 1, 1 ]
*
* out = sample({
* 'size': 10
* });
* // e.g., returns [ 0, 1, 1, 1, 0, 1, 0, 0, 1, 1 ]
*
* @example
* var sample = factory( [ 0, 1 ], {
* 'size': 2
* });
*
* var out = sample();
* // e.g., returns [ 1, 1 ]
*
* out = sample({
* 'replace': false
* });
* // e.g., returns [ 0, 1 ] or [ 1, 0 ]
*
* out = sample();
* // e.g., returns [ 1, 1 ]
*
* @example
* var sample = factory( [ 0, 1 ], {
* 'size': 2,
* 'mutate': true
* });
*
* var out = sample();
* // e.g., returns [ 1, 1 ]
*
* out = sample({
* 'replace': false
* });
* // e.g., returns [ 0, 1 ] or [ 1, 0 ]
*
* out = sample();
* // returns null
*/
function factory() {
var config;
var pool;
var conf;
var rand;
var err;
var fcn;
conf = copy( defaults );
if ( arguments.length === 1 ) {
if ( isArrayLike( arguments[ 0 ] ) || isTypedArrayLike( arguments[ 0 ] ) ) { // eslint-disable-line max-len
pool = arguments[ 0 ];
} else {
config = arguments[ 0 ];
err = validate( conf, config );
}
} else if ( arguments.length > 1 ) {
pool = arguments[ 0 ];
config = arguments[ 1 ];
if ( !( isArrayLike( pool ) || isTypedArrayLike( pool ) ) ) {
throw new TypeError( format( 'invalid argument. `%s` argument must be array-like. Value: `%s`.', 'pool', pool ) );
}
err = validate( conf, config );
}
if ( err ) {
throw err;
}
if ( config && config.seed ) {
rand = randu({
'seed': config.seed
});
} else {
rand = randu();
}
if ( pool === void 0 ) {
fcn = sample1;
} else {
if ( isString( pool ) ) {
pool = pool.split( '' );
} else {
pool = copy( pool );
}
fcn = sample2;
}
setReadOnly( fcn, 'seed', rand.seed );
setReadOnly( fcn, 'PRNG', rand );
rand = rand.normalized;
return fcn;
/**
* Samples elements from an array-like object.
*
* @private
* @param {(ArrayLike|TypedArrayLike)} x - array-like object from which to sample elements
* @param {Options} [options] - function options
* @param {NonNegativeInteger} [options.size] - sample size
* @param {ProbabilityArray} [options.probs] - element probabilities
* @param {boolean} [options.replace=true] - boolean indicating whether to sample with replacement
* @throws {TypeError} first argument must be array-like
* @throws {TypeError} options argument must be an object
* @throws {TypeError} must provide valid options
* @throws {RangeError} `size` option must be less than or equal to the length of `x` when the `replace` option is `false`
* @returns {Array} sample
*/
function sample1( x, options ) {
var replace;
var xcopy;
var probs;
var opts;
var size;
var err;
if ( !( isArrayLike( x ) || isTypedArrayLike( x ) ) ) {
throw new TypeError( format( 'invalid argument. First argument must be array-like. Value: `%s`.', x ) );
}
if ( isString( x ) ) {
x = x.split( '' );
}
opts = {};
if ( arguments.length > 1 ) {
err = validate( opts, options );
if ( err ) {
throw err;
}
}
if ( opts.replace === void 0 ) {
replace = conf.replace;
} else {
replace = opts.replace;
}
if ( opts.probs !== void 0 ) {
probs = opts.probs;
}
if ( opts.size ) {
size = opts.size;
} else if ( conf.size ) {
size = conf.size;
} else {
size = x.length;
}
if (
replace === false &&
size > x.length
) {
throw new RangeError( format( 'invalid option. `size` option must be less than or equal to the length of `x` when `replace` is `false`. Option: `%s`.', size ) );
}
// Custom probabilities...
if ( probs ) {
if ( replace ) {
return vose( x, size, rand, probs );
}
return renormalizing( x, size, rand, probs );
}
// All elements equally likely...
if ( replace ) {
return discreteUniform( x, size, rand );
}
xcopy = slice.call( x );
return fisherYates( xcopy, size, rand );
}
/**
* Samples elements from a population.
*
* @private
* @param {Options} [options] - function options
* @param {NonNegativeInteger} [options.size] - sample size
* @param {boolean} [options.replace=true] - boolean indicating whether to sample with replacement
* @param {boolean} [options.mutate=false] - boolean indicating whether to mutate the `pool` when sampling without replacement
* @throws {TypeError} options argument must be an object
* @throws {TypeError} must provide valid options
* @throws {RangeError} `size` option must be less than or equal to the population when the `replace` option is `false`
* @returns {Array} sample
*/
function sample2( options ) {
var replace;
var mutate;
var opts;
var size;
var err;
var out;
if ( pool.length === 0 ) {
return null;
}
opts = {};
if ( arguments.length ) {
err = validate( opts, options );
if ( err ) {
throw err;
}
}
if ( opts.mutate === void 0 ) {
mutate = conf.mutate;
} else {
mutate = opts.mutate;
}
if ( opts.replace === void 0 ) {
replace = conf.replace;
} else {
replace = opts.replace;
}
if ( opts.size ) {
size = opts.size;
} else if ( conf.size ) {
size = conf.size;
} else {
size = pool.length;
}
if (
replace === false &&
size > pool.length
) {
throw new RangeError( format( 'invalid option. `size` option must be less than or equal to the population size when `replace` is `false`. Option: `%s`.', size ) );
}
if ( replace ) {
return discreteUniform( pool, size, rand );
}
out = fisherYates( pool, size, rand );
if ( mutate ) {
// Remove the sample observations:
pool = pool.slice( size, pool.length );
}
return out;
}
}
// EXPORTS //
module.exports = factory;
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