76 lines
1.8 KiB
JavaScript
76 lines
1.8 KiB
JavaScript
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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var isNonNegativeIntegerArray = require( '@stdlib/assert/is-nonnegative-integer-array' ).primitives;
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var tic = require( './../../tic' );
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// MAIN //
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/**
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* Returns a high-resolution time difference.
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*
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* ## Notes
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*
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* - Output format: `[seconds, nanoseconds]`.
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*
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*
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* @param {NonNegativeIntegerArray} time - high-resolution time
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* @throws {TypeError} must provide a nonnegative integer array
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* @throws {RangeError} input array must have length `2`
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* @returns {NumberArray} high resolution time difference
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*
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* @example
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* var tic = require( '@stdlib/time/tic' );
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*
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* var start = tic();
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* var delta = toc( start );
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* // returns [<number>,<number>]
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*/
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function toc( time ) {
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var now = tic();
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var sec;
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var ns;
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if ( !isNonNegativeIntegerArray( time ) ) {
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throw new TypeError( 'invalid argument. Must provide an array of nonnegative integers. Value: `' + time + '`.' );
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}
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if ( time.length !== 2 ) {
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throw new RangeError( 'invalid argument. Input array must have length `2`.' );
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}
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sec = now[ 0 ] - time[ 0 ];
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ns = now[ 1 ] - time[ 1 ];
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if ( sec > 0 && ns < 0 ) {
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sec -= 1;
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ns += 1e9;
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}
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else if ( sec < 0 && ns > 0 ) {
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sec += 1;
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ns -= 1e9;
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}
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return [ sec, ns ];
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}
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// EXPORTS //
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module.exports = toc;
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