time-to-botec/squiggle/node_modules/@stdlib/string/startcase/lib/startcase.js

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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 isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var reWhitespace = require( '@stdlib/regexp/whitespace' );
var format = require( './../../format' );
// MAIN //
/**
* Capitalizes the first letter of each word in an input string.
*
* @param {string} str - string to convert
* @throws {TypeError} must provide a string
* @returns {string} start case string
*
* @example
* var str = startcase( 'beep boop foo bar' );
* // returns 'Beep Boop Foo Bar'
*/
function startcase( str ) {
var cap;
var out;
var ch;
var i;
if ( !isString( str ) ) {
throw new TypeError( format( 'invalid argument. Must provide a string. Value: `%s`.', str ) );
}
cap = true;
out = '';
for ( i = 0; i < str.length; i++ ) {
ch = str.charAt( i );
if ( reWhitespace.REGEXP.test( ch ) ) {
out += ch;
cap = true;
} else if ( cap ) {
out += ch.toUpperCase();
cap = false;
} else {
out += ch;
}
}
return out;
}
// EXPORTS //
module.exports = startcase;