time-to-botec

Benchmark sampling in different programming languages
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main.js (2003B)

      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 var toUint32 = require( './../../../../float64/base/to-uint32' );
     25 
     26 
     27 // VARIABLES //
     28 
     29 var NBITS = 32;
     30 
     31 
     32 // MAIN //
     33 
     34 /**
     35 * Creates an unsigned 32-bit integer from a literal bit representation.
     36 *
     37 * @param {BinaryString} bstr - string which is a literal bit representation
     38 * @throws {Error} must provide a string with a length equal to `32`
     39 * @returns {uinteger32} unsigned 32-bit integer
     40 *
     41 * @example
     42 * var bstr = '01010101010101010101010101010101';
     43 * var val = fromBinaryStringUint32( bstr );
     44 * // returns 1431655765
     45 *
     46 * @example
     47 * var bstr = '00000000000000000000000000000000';
     48 * var val = fromBinaryStringUint32( bstr );
     49 * // returns 0
     50 *
     51 * @example
     52 * var bstr = '00000000000000000000000000000010';
     53 * var val = fromBinaryStringUint32( bstr );
     54 * // returns 2
     55 *
     56 * @example
     57 * var bstr = '11111111111111111111111111111111';
     58 * var val = fromBinaryStringUint32( bstr );
     59 * // returns 4294967295
     60 */
     61 function fromBinaryStringUint32( bstr ) {
     62 	var sum;
     63 	var i;
     64 	if ( bstr.length !== NBITS ) {
     65 		throw new Error( 'invalid argument. Input string must have a length equal to '+NBITS+'. Value: `'+bstr+'`.' );
     66 	}
     67 	sum = 0;
     68 	for ( i = 0; i < bstr.length; i++ ) {
     69 		if ( bstr[ i ] === '1' ) {
     70 			sum += pow( 2, (NBITS-i-1) );
     71 		}
     72 	}
     73 	return toUint32( sum );
     74 }
     75 
     76 
     77 // EXPORTS //
     78 
     79 module.exports = fromBinaryStringUint32;