@stdlib/string/repeat/lib/main.js

String manipulation functions.

/**
* @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 isNonNegativeInteger = require( '@stdlib/assert/is-nonnegative-integer' ).isPrimitive;
var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var format = require( './../../format' );
var base = require( './../../base/repeat' );


// MAIN //

/**
* Repeats a string a specified number of times and returns the concatenated result.
*
* @param {string} str - string to repeat
* @param {NonNegativeInteger} n - number of times to repeat the string
* @throws {TypeError} first argument must be a string
* @throws {TypeError} second argument must be a nonnegative integer
* @throws {RangeError} output string length must not exceed maximum allowed string length
* @returns {string} repeated string
*
* @example
* var str = repeat( 'a', 5 );
* // returns 'aaaaa'
*
* @example
* var str = repeat( '', 100 );
* // returns ''
*
* @example
* var str = repeat( 'beep', 0 );
* // returns ''
*/
function repeat( str, n ) {
	if ( !isString( str ) ) {
		throw new TypeError( format( 'invalid argument. First argument must be a string. Value: `%s`.', str ) );
	}
	if ( !isNonNegativeInteger( n ) ) {
		throw new TypeError( format( 'invalid argument. Second argument must be a nonnegative integer. Value: `%s`.', n ) );
	}
	return base( str, n );
}


// EXPORTS //

module.exports = repeat;