time-to-botec

Benchmark sampling in different programming languages
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main.js (1851B)

      1 /**
      2 * @license Apache-2.0
      3 *
      4 * Copyright (c) 2018 The Stdlib Authors.
      5 *
      6 * Licensed under the Apache License, Version 2.0 (the "License");
      7 * you may not use this file except in compliance with the License.
      8 * You may obtain a copy of the License at
      9 *
     10 *    http://www.apache.org/licenses/LICENSE-2.0
     11 *
     12 * Unless required by applicable law or agreed to in writing, software
     13 * distributed under the License is distributed on an "AS IS" BASIS,
     14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     15 * See the License for the specific language governing permissions and
     16 * limitations under the License.
     17 */
     18 
     19 'use strict';
     20 
     21 // MODULES //
     22 
     23 var pow = require( '@stdlib/math/base/special/pow' );
     24 
     25 
     26 // VARIABLES //
     27 
     28 var NBITS = 16;
     29 
     30 
     31 // MAIN //
     32 
     33 /**
     34 * Creates an unsigned 16-bit integer from a literal bit representation.
     35 *
     36 * @param {BinaryString} bstr - string which is a literal bit representation
     37 * @throws {Error} must provide a string with a length equal to `16`
     38 * @returns {uinteger16} unsigned 16-bit integer
     39 *
     40 * @example
     41 * var bstr = '0101010101010101';
     42 * var val = fromBinaryStringUint16( bstr );
     43 * // returns 21845
     44 *
     45 * @example
     46 * var bstr = '0000000000000000';
     47 * var val = fromBinaryStringUint16( bstr );
     48 * // returns 0
     49 *
     50 * @example
     51 * var bstr = '0000000000000010';
     52 * var val = fromBinaryStringUint16( bstr );
     53 * // returns 2
     54 *
     55 * @example
     56 * var bstr = '1111111111111111';
     57 * var val = fromBinaryStringUint16( bstr );
     58 * // returns 65535
     59 */
     60 function fromBinaryStringUint16( bstr ) {
     61 	var sum;
     62 	var i;
     63 	if ( bstr.length !== NBITS ) {
     64 		throw new Error( 'invalid argument. Input string must have a length equal to '+NBITS+'. Value: `'+bstr+'`.' );
     65 	}
     66 	sum = 0;
     67 	for ( i = 0; i < bstr.length; i++ ) {
     68 		if ( bstr[ i ] === '1' ) {
     69 			sum += pow( 2, (NBITS-i-1) );
     70 		}
     71 	}
     72 	return sum;
     73 }
     74 
     75 
     76 // EXPORTS //
     77 
     78 module.exports = fromBinaryStringUint16;