5 	keys.slice(0, -1).forEach(function (key) {  argument
6 		o = o[key] || {};
9 	var key = keys[keys.length - 1];
10 	return key in o;
19 function isConstructorOrProto(obj, key) {  argument
20 	return (key === 'constructor' && typeof obj[key] === 'function') || key === '__proto__';
39 		[].concat(opts.boolean).filter(Boolean).forEach(function (key) {  argument
40 			flags.bools[key] = true;
46 	function aliasIsBoolean(key) {  argument
47 		return aliases[key].some(function (x) {
52 	Object.keys(opts.alias || {}).forEach(function (key) {  argument
53 		aliases[key] = [].concat(opts.alias[key]);
54 		aliases[key].forEach(function (x) {
55 			aliases[x] = [key].concat(aliases[key].filter(function (y) {
61 	[].concat(opts.string).filter(Boolean).forEach(function (key) {  argument
62 		flags.strings[key] = true;
63 		if (aliases[key]) {
64 			[].concat(aliases[key]).forEach(function (k) {
74 	function argDefined(key, arg) {  argument
76 			|| flags.strings[key]
77 			|| flags.bools[key]
78 			|| aliases[key];
84 			var key = keys[i];
85 			if (isConstructorOrProto(o, key)) { return; }
86 			if (o[key] === undefined) { o[key] = {}; }
88 				o[key] === Object.prototype
89 				|| o[key] === Number.prototype
90 				|| o[key] === String.prototype
92 				o[key] = {};
94 			if (o[key] === Array.prototype) { o[key] = []; }
95 			o = o[key];
117 	function setArg(key, val, arg) {  argument
118 		if (arg && flags.unknownFn && !argDefined(key, arg)) {
122 		var value = !flags.strings[key] && isNumber(val)
125 		setKey(argv, key.split('.'), value);
127 		(aliases[key] || []).forEach(function (x) {
132 	Object.keys(flags.bools).forEach(function (key) {  argument
133 		setArg(key, defaults[key] === undefined ? false : defaults[key]);
145 		var key;
153 			key = m[1];
155 			if (flags.bools[key]) {
158 			setArg(key, value, arg);
160 			key = arg.match(/^--no-(.+)/)[1];
161 			setArg(key, false, arg);
163 			key = arg.match(/^--(.+)/)[1];
168 				&& !flags.bools[key]
170 				&& (aliases[key] ? !aliasIsBoolean(key) : true)
172 				setArg(key, next, arg);
175 				setArg(key, next === 'true', arg);
178 				setArg(key, flags.strings[key] ? '' : true, arg);
216 			key = arg.slice(-1)[0];
217 			if (!broken && key !== '-') {
221 					&& !flags.bools[key]
222 					&& (aliases[key] ? !aliasIsBoolean(key) : true)
224 					setArg(key, args[i + 1], arg);
227 					setArg(key, args[i + 1] === 'true', arg);
230 					setArg(key, flags.strings[key] ? '' : true, arg);