91 lines
2.5 KiB
JavaScript
91 lines
2.5 KiB
JavaScript
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2021 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 isString = require( '@stdlib/assert/is-string' ).isPrimitive;
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var isInteger = require( '@stdlib/assert/is-integer' ).isPrimitive;
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var format = require( './../../format' );
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// MAIN //
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/**
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* Returns the part of a string after a specified substring.
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*
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* @param {string} str - input string
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* @param {string} search - search string
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* @param {integer} [fromIndex=0] - index at which to start the search
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* @throws {TypeError} first argument must be a string
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* @throws {TypeError} second argument must be a string
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* @throws {TypeError} third argument must be an integer
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* @returns {string} substring
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*
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* @example
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* var out = substringAfter( 'Hello, world!', ', ' );
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* // returns 'world!'
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*
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* @example
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* var out = substringAfter( 'beep boop', 'beep' );
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* // returns ' boop'
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*
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* @example
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* var out = substringAfter( 'beep boop', 'boop' );
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* // returns ''
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*
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* @example
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* var out = substringAfter( 'beep boop', 'xyz' );
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* // returns ''
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*
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* @example
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* var out = substringAfter( 'beep boop', 'beep', 5 );
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* // returns ''
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*
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* @example
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* var out = substringAfter( 'beep boop beep baz', 'beep', 5 );
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* // returns ' baz'
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*/
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function substringAfter( str, search, fromIndex ) {
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var idx;
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if ( !isString( str ) ) {
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throw new TypeError( format( 'invalid argument. First argument must be a string. Value: `%s`.', str ) );
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}
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if ( !isString( search ) ) {
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throw new TypeError( format( 'invalid argument. Second argument must be a string. Value: `%s`.', search ) );
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}
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if ( arguments.length > 2 ) {
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if ( !isInteger( fromIndex ) ) {
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throw new TypeError( format( 'invalid argument. Third argument must be an integer. Value: `%s`.', fromIndex ) );
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}
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idx = str.indexOf( search, fromIndex );
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} else {
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idx = str.indexOf( search );
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}
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if ( idx === -1 ) {
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return '';
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}
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return str.substring( idx+search.length );
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}
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// EXPORTS //
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module.exports = substringAfter;
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