Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x | /**
* @license Apache-2.0
*
* Copyright (c) 2024 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 isNonNegativeInteger = require( '@stdlib/assert/is-nonnegative-integer' ).isPrimitive;
var isPlainObject = require( '@stdlib/assert/is-plain-object' );
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var contains = require( '@stdlib/array/base/assert/contains' ).factory;
var lastCodeUnit = require( '@stdlib/string/base/last' );
var lastCodePoint = require( '@stdlib/string/base/last-code-point' );
var lastGraphemeCluster = require( '@stdlib/string/base/last-grapheme-cluster' );
var format = require( '@stdlib/string/format' );
// VARIABLES //
var MODES = [ 'grapheme', 'code_point', 'code_unit' ];
var FCNS = {
'grapheme': lastGraphemeCluster,
'code_point': lastCodePoint,
'code_unit': lastCodeUnit
};
var isMode = contains( MODES );
// MAIN //
/**
* Returns the last character(s) of a string.
*
* @param {string} str - input string
* @param {NonNegativeInteger} [n=1] - number of characters to return
* @param {Options} [options] - options
* @param {string} [options.mode="grapheme"] - type of "character" to return (must be either `grapheme`, `code_point`, or `code_unit`)
* @throws {TypeError} last argument must be a string
* @throws {TypeError} second argument must be a nonnegative integer
* @throws {TypeError} options argument must be an object
* @throws {TypeError} must provide valid options
* @returns {string} output string
*
* @example
* var out = last( 'last man standing' );
* // returns 'g'
*
* @example
* var out = last( 'presidential election' );
* // returns 'n'
*
* @example
* var out = last( 'javaScript' );
* // returns 't'
*
* @example
* var out = last( 'Hidden Treasures' );
* // returns 's'
*
* @example
* var out = last( '🐶🐮🐷🐰🐸', 2 );
* // returns '🐰🐸'
*
* @example
* var out = last( 'foo bar', 3 );
* // returns 'bar'
*/
function last( str ) {
var options;
var nargs;
var opts;
var n;
if ( !isString( str ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a string. Value: `%s`.', str ) );
}
opts = {
'mode': 'grapheme'
};
nargs = arguments.length;
if ( nargs === 1 ) {
n = 1;
} else if ( nargs === 2 ) {
n = arguments[ 1 ];
if ( isPlainObject( n ) ) {
options = n;
n = 1;
} else if ( !isNonNegativeInteger( n ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be a nonnegative integer. Value: `%s`.', n ) );
}
} else { // nargs > 2
n = arguments[ 1 ];
if ( !isNonNegativeInteger( n ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be a nonnegative integer. Value: `%s`.', n ) );
}
options = arguments[ 2 ];
if ( !isPlainObject( options ) ) {
throw new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', options ) );
}
}
if ( options ) {
if ( hasOwnProp( options, 'mode' ) ) {
opts.mode = options.mode;
if ( !isMode( opts.mode ) ) {
throw new TypeError( format( 'invalid option. `%s` option must be one of the following: "%s". Value: `%s`.', 'mode', MODES.join( '", "' ), opts.mode ) );
}
}
}
return FCNS[ opts.mode ]( str, n );
}
// EXPORTS //
module.exports = last;
|