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uh hello guys welcome to this video so
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in this video we will talk about the for
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each Loop for each Loop is uh widely
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used inside programming inside uh
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day-to-day task related to development
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so this is a widely used Loop so let's
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suppose you have a array of data that
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you want to Loop let me declare a array
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here so let me this is a numeric array
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it will have five numbers let me put
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these
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numbers so we have these five numbers in
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this array the first second 3 4 five so
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five elements are there in this array so
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now we can simply run this for each Loop
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so how we need to run this so first of
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all whatever is your array name I will
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write this num and then we have this for
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each Loop you will see in the drop down
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for each is coming so we'll simply use
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this for
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each and now it take actually takes
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three arguments there
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uh but in our day-to-day task we only
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use the first one which is actual value
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so I can call this as n so in a short
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head notation we actually write like
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this so it actually takes the argument
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of n the very first argument it is
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actual
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and you you can call it anything I'm
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just calling it n right here so it
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actually refers to the value so if I
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just console log it on the screen you
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will see it will print out these values
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One By One The arrays 34 56 78 89 45 so
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whatever is there inside this array one
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by one it is Loop through inside this uh
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variable the first variable which is
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passed to this for each Loop so one by
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one all the elements will be printed out
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so in this way we actually Loop through
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an array using this for each Loop the
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second variable which is takes is the
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index variable so if you also want to
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print out the position as well so as you
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know in uh arrays indexing start from
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zero so this is a zero Index this is one
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this is two this is three this is four
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if you also want to print the index you
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have this Set uh
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second argument which is passed which is
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index you can call this anything I'm
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just calling it index so again you can
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console log the index which is actually
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the position of the element and now you
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will see it will print out so 34 is
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located at zero index because the
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indexing start from zero then this
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element is at one location this is at
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two
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location three index number and four so
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from 0 to four there are five elements
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in the array so the indexing start from
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0o 0 1 2 3 4 so this is the second
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argument it takes is the index
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positioning of the array the third
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argument if you don't know it is
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actually the array
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itself so you can simply console log
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this so which is actually the actual
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array so whatever is you will see all
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the five elements which is there in the
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array so this is the third argument
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which is passed which is actual
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array so in all these five scenarios the
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same array will be passed so if you do
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need to use this array variable so this
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is also available but we don't widely
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use this variable so we can delete this
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so widely two two variables are used in
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this for each Loop first is actual value
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to iterate through one by one and then
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the index position so this is 0 1 2 3 4
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so these are two widely used variable uh
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arguments so so the third argument is
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the actual are itself you can use it but
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we don't use it
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so in a nutshell this is actually the
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for each Loop it is just used to Loop
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through the data if you have so this may
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be array of objects as well so this is
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actually a very simpler array let's
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suppose we have an array of objects that
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you want to Loop so we have one
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object name we can say Smith age we can
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say 27 and then we can repeat
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this quite a number of times so we can
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simp simply paste
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it so we can just change
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it naan you can change the
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names Jamie and I can
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J and now if you want to Loop through
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this array of
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objects again the logic remain the same
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you just use for each array will change
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but the syntax will remain the same we
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again just say for each and and now we
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can simply if you see we are simply
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putting the positions here 012 index
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number and this is actually printing the
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whole object so this represents the one
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location that you see this is currently
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selected object now this is an object
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here this is not a array so now for the
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object we need to destructure the
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property so we can say n do name so it
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will print out the names here we can see
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Smith name J K so in this way you can
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print out individual properties of an
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object so n do H so it is printing out
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the name and age for you so in this way
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you can Loop through any data structure
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it can be object it can be array so it
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can be used for any of the data
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structures which is this for each Loop
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so it is widely used in programming I
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also use it a lot whenever I'm
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developing projects so it's a
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very uh widely used Loop so you must
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know it if you want to study JavaScript
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or nodejs you must know this for each
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Loop and it's very useful so thank you
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very much guys for watching this video
6:12
about for each Loop please hit that like
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button subscribe the channel and do
6:16
check out my website as well which is
6:18
freem mediat tools.com which is a
6:21
open-source website regarding audio
6:23
video and video tools you can check out
6:25
this tool website that I developed by me
6:28
so I will be seeing you guys in the next
6:30
video
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