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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 logger = require( 'debug' );
var isFunction = require( '@stdlib/assert/is-function' );
var format = require( '@stdlib/string/format' );
// VARIABLES //
var debug = logger( 'rug:set:scale' );
// MAIN //
/**
* Sets the scale function.
*
* @private
* @param {Function} fcn - scale
* @throws {TypeError} must be a function
*/
function set( fcn ) {
/* eslint-disable no-invalid-this */
if ( !isFunction( fcn ) ) {
throw new TypeError( format( 'invalid assignment. `%s` must be a function. Value: `%s`.', 'scale', fcn ) );
}
if ( fcn !== this._scale ) {
debug( 'Current value: %s.', this._scale );
this._scale = fcn;
debug( 'New Value: %s.', this._scale );
this.emit( 'change' );
}
}
// EXPORTS //
module.exports = set;
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