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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';
// MAIN //
/**
* Wraps an index on the interval `[0,max]`.
*
* @param {integer} idx - index
* @param {NonNegativeInteger} max - maximum index
* @returns {NonNegativeInteger} index
*
* @example
* var idx = wrapIndex( -1, 10 );
* // returns 10
*
* idx = wrapIndex( 13, 10 );
* // returns 2
*
* idx = wrapIndex( 6, 10 );
* // returns 6
*/
function wrapIndex( idx, max ) {
var mp1 = max + 1;
if ( idx < 0 ) {
idx += mp1; // slight optimization to avoid modulo arithmetic when |idx| <= max+1
if ( idx < 0 ) {
idx %= mp1;
if ( idx !== 0 ) {
idx += mp1;
}
}
return idx;
}
if ( idx > max ) {
idx -= mp1; // slight optimization to avoid modulo arithmetic when max+1 < idx <= 2*(max+1)
if ( idx > max ) {
idx %= mp1;
}
return idx;
}
return idx;
}
// EXPORTS //
module.exports = wrapIndex;
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