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* @license Apache-2.0
*
* Copyright (c) 2019 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 isFunction = require( '@stdlib/assert/is-function' );
var isIteratorLike = require( '@stdlib/assert/is-iterator-like' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Returns an iterator "thunk".
*
* @param {Function} iterFcn - iterator function
* @param {...*} [args] - function arguments
* @throws {TypeError} first argument must be a function
* @returns {Function} iterator "thunk"
*
* @example
* var array2iterator = require( '@stdlib/array/to-iterator' );
* var iterSome = require( '@stdlib/iter/some' );
*
* var it = array2iterator( [ 0, 0, 1, 1, 1 ] );
*
* var thunk = iterThunk( iterSome, 3 );
*
* var bool = thunk( it );
* // returns true
*/
function iterThunk( iterFcn ) {
var pargs;
var nargs;
var i;
if ( !isFunction( iterFcn ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a function. Value: `%s`.', iterFcn ) );
}
nargs = arguments.length;
pargs = [];
for ( i = 1; i < nargs; i++ ) {
pargs.push( arguments[ i ] );
}
return thunk;
/**
* Invokes an iterator function with a provided iterator and previously provided iterator function arguments.
*
* @private
* @param {Iterator} iter - input iterator
* @throws {TypeError} must provide an iterator
* @returns {*} iterator function result
*/
function thunk( iter ) {
var args;
var i;
if ( !isIteratorLike( iter ) ) {
throw new TypeError( format( 'invalid argument. Must provide an iterator. Value: `%s`.', iter ) );
}
args = [ iter ];
for ( i = 0; i < nargs; i++ ) {
args.push( pargs[ i ] );
}
return iterFcn.apply( null, args );
}
}
// EXPORTS //
module.exports = iterThunk;
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