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SʣwʇqdcnB*'.(StSշ]E/Lm OqnFVm@:g WTI&;:VjJ|}o#,baCXcCXp{0℔^(\}JU/106 00:05:46,710 --> 00:05:48,770 and let's use 1991 again 107 00:05:49,790 --> 00:05:54,230 and then let's grab this console.log here 108 00:05:54,230 --> 00:05:58,383 and log both the ages, So age2 here, 109 00:05:59,650 --> 00:06:01,653 let's also add some comments here, 110 00:06:03,350 --> 00:06:08,350 function declaration and function expression. 111 00:06:13,200 --> 00:06:15,730 And so we should get twice 112 00:06:15,730 --> 00:06:19,800 the 46 value here and yes, indeed. 113 00:06:19,800 --> 00:06:22,320 So the functional expression works 114 00:06:22,320 --> 00:06:25,120 the exact same way as the function declaration. 115 00:06:25,120 --> 00:06:27,500 So we call it in the same way we capture 116 00:06:27,500 --> 00:06:29,700 the return value in the same way 117 00:06:29,700 --> 00:06:32,890 and then of course the result is also the same 118 00:06:32,890 --> 00:06:36,020 because the function body is the same. 119 00:06:36,020 --> 00:06:37,480 But it's very important to know 120 00:06:37,480 --> 00:06:41,020 that we have these two type of functions in JavaScript. 121 00:06:41,020 --> 00:06:43,580 Because in some places we will actually need 122 00:06:43,580 --> 00:06:45,540 to write them like this, 123 00:06:45,540 --> 00:06:48,740 as you will see as we go through the course. 124 00:06:48,740 --> 00:06:51,610 So again, this part here that I just highlighted 125 00:06:51,610 --> 00:06:54,970 this function here is in fact an expression 126 00:06:54,970 --> 00:06:58,440 and remember that expressions produce values. 127 00:06:58,440 --> 00:07:01,200 And so we just assign this whole value here 128 00:07:01,200 --> 00:07:04,100 then to this variable. 129 00:07:04,100 --> 00:07:06,480 And so this variable will then hold 130 00:07:06,480 --> 00:07:09,020 this function value basically. 131 00:07:09,020 --> 00:07:12,320 And one big implication of what I just said, 132 00:07:12,320 --> 00:07:15,310 So, that this here is just a value, yeah, 133 00:07:15,310 --> 00:07:17,420 is that in fact in JavaScript, 134 00:07:17,420 --> 00:07:20,050 functions are actually just values. 135 00:07:20,050 --> 00:07:24,290 So just as a number or a string or a boolean value. 136 00:07:24,290 --> 00:07:26,190 So a function is not a type, okay? 137 00:07:26,190 --> 00:07:28,800 It's not like a string or number type 138 00:07:28,800 --> 00:07:31,090 but it's also a value. 139 00:07:31,090 --> 00:07:34,670 And so if it's a value, we can store it in a variable. 140 00:07:34,670 --> 00:07:36,160 So just keep this in mind 141 00:07:36,160 --> 00:07:38,870 because it will become very important later 142 00:07:38,870 --> 00:07:42,400 when we really dig deep into functions. 143 00:07:42,400 --> 00:07:45,350 Now, besides these technical differences, 144 00:07:45,350 --> 00:07:48,100 you might be wondering what is the big deal? 145 00:07:48,100 --> 00:07:49,860 So what's the big difference between 146 00:07:49,860 --> 00:07:53,480 function declarations and function expressions? 147 00:07:53,480 --> 00:07:55,640 Well, the main practical difference 148 00:07:55,640 --> 00:07:58,600 is that we can actually call function declarations 149 00:07:58,600 --> 00:08:01,660 before they are defined in the code. 150 00:08:01,660 --> 00:08:05,130 So let me show that to you. 151 00:08:05,130 --> 00:08:07,720 So here is the declaration, right? 152 00:08:07,720 --> 00:08:10,700 This is the function declaration and as I just said, 153 00:08:10,700 --> 00:08:15,700 we can call them in a code before they are defined. 154 00:08:16,780 --> 00:08:21,260 So now we're calling it first and then defining it later. 155 00:08:21,260 --> 00:08:23,260 So let me show you that that still works 156 00:08:24,760 --> 00:08:27,390 and indeed we still get the same result. 157 00:08:27,390 --> 00:08:30,353 But if we attempt to do the same with the expression, 158 00:08:32,460 --> 00:08:34,650 then that should not work. 159 00:08:34,650 --> 00:08:38,570 So let's see and yeah, 160 00:08:38,570 --> 00:08:42,962 so cannot access calcAge2 before initialization, okay? 161 00:08:44,580 --> 00:08:46,790 and internally this happens 162 00:08:46,790 --> 00:08:49,800 because of a process called hoisting 163 00:08:49,800 --> 00:08:54,520 but more about that in a future section, okay? 164 00:08:54,520 --> 00:08:58,620 For now just keep in mind that you can call 165 00:08:58,620 --> 00:09:01,670 a function declaration before you define it 166 00:09:01,670 --> 00:09:06,670 even though that might not be such a good idea in many cases 167 00:09:06,810 --> 00:09:09,850 but you can do it if necessary. 168 00:09:09,850 --> 00:09:11,840 All right, now another question 169 00:09:11,840 --> 00:09:13,580 that you might have in your mind 170 00:09:13,580 --> 00:09:17,030 is which of the two types of functions should I use 171 00:09:17,030 --> 00:09:19,860 when I write my own functions? 172 00:09:19,860 --> 00:09:23,420 And well, the answer is that oftentimes 173 00:09:23,420 --> 00:09:27,070 it's really just a matter of personal preference. 174 00:09:27,070 --> 00:09:30,680 and so different developers prefer different formats. 175 00:09:30,680 --> 00:09:34,470 Personally, I prefer to use function expressions 176 00:09:34,470 --> 00:09:37,980 because this then forces me into a nice structure 177 00:09:37,980 --> 00:09:40,630 where I have to define all the functions first 178 00:09:40,630 --> 00:09:44,190 at the top of the code and only then I can call them. 179 00:09:44,190 --> 00:09:46,590 So this makes the code a little bit nicer 180 00:09:46,590 --> 00:09:48,330 and more structured. 181 00:09:48,330 --> 00:09:52,040 I also like to have everything stored in variables, 182 00:09:52,040 --> 00:09:55,640 so both values and functions, but again, 183 00:09:55,640 --> 00:09:58,520 that is just my own personal preference. 184 00:09:58,520 --> 00:10:01,580 And many other developers don't agree with this 185 00:10:01,580 --> 00:10:04,400 and prefer to use function declarations. 186 00:10:04,400 --> 00:10:08,470 So, if you also prefer a function declarations, that's fine. 187 00:10:08,470 --> 00:10:11,030 So, just use declarations then. 188 00:10:11,030 --> 00:10:13,030 It's absolutely no problem. 189 00:10:13,030 --> 00:10:16,570 However, even if you prefer one over the other, 190 00:10:16,570 --> 00:10:18,840 you still need to know about both 191 00:10:18,840 --> 00:10:22,360 the function expressions and function declarations. 192 00:10:22,360 --> 00:10:24,030 So you can not just pick one 193 00:10:24,030 --> 00:10:26,000 and then forget the other one 194 00:10:26,000 --> 00:10:29,140 because both have their place in JavaScript. 195 00:10:29,140 --> 00:10:31,370 And so it's really important that you know 196 00:10:31,370 --> 00:10:33,780 how to use and how's to distinguish 197 00:10:33,780 --> 00:10:36,913 both function declarations and expressions.