34 lines
864 B
JavaScript
34 lines
864 B
JavaScript
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/*jslint node: true */
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var listify = function listify(list) {
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"use strict";
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if (!Array.isArray(list)) {
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throw new TypeError('requires an array');
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}
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var options = arguments.length > 1 ? arguments[1] : null;
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if (!options) {
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options = {};
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}
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var separator = options.hasOwnProperty('separator') ? options.separator : ', ';
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var finalWord = options.hasOwnProperty('finalWord') ? options.finalWord : 'and';
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if (finalWord.length > 0) {
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finalWord += ' ';
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}
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var trimmed = list.filter(function (item) { return String(item).trim(); });
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var str;
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if (trimmed.length === 2 && finalWord.length > 0) {
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str = trimmed.join(' ' + finalWord);
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} else if (trimmed.length < 3) {
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str = trimmed.join(separator);
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} else {
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str = trimmed.slice(0, -1).concat(finalWord + trimmed[trimmed.length - 1]).join(separator);
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}
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return str;
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};
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module.exports = listify;
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