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Javascript Array every() Method to Check Condition on All Array Elements Full Example
Jan 9, 2025
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uh Hello friends welcome to this video
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so in this video we will look at another
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JavaScript array method I this method is
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used for conditional purpose so if you
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have a array of values and then you can
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actually test out a function against
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these values so this method is actually
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called as
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every so let's suppose you
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declare a array a set of Ages you have
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inside so all these values will be
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numeric so 45 40
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35 30 25 so we actually declared an
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array here ages so it basically holds
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ages for different persones so this is
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person one person two person three
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person four person five so five ages we
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have put right here in this array and
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now we need to write a
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function to actually
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test that all all these ages it should
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be above it should be less than 50 so
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now to write that function we will write
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a function custom function this function
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name can be anything so we have written
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check is so what this function does it
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actually takes the age as an argument so
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one by one it will test out all the
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values of this array one by one can see
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that so now it will it can be anything
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I'm just taking example right here which
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is ages so you're putting it and what
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this function does the business logic of
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this function is it will all just return
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the AG if it
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is greater if it is smaller than
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50 this is actually a condition that we
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put right here for each age that you
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pass you will compare it that this a
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should be smaller than 50
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so one by one now we will actually
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invoke this so now to actually call this
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function we actually write the function
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array name which is ages and this
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actually is the every method that we are
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talking about and right here we will
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pass the function
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name right as an argument in
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this so we'll simply pass this function
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which we want to check so what this
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function does uh it actually returns
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either a true or false value you can see
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nothing is print printed out in the
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console we need to print it out so the
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value we need to
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give so we can directly console log this
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value so if you now see uh True Value is
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returned to
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us why it is happening because if you
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check it is actually executing this
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function for every array value that we
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have check age function so this ages
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function 45 if you directly test out 45
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is smaller than 50 so it is true and
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then 40 is also smaller than 50 true 35
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also is true 30 uh smaller than 50 true
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25 smaller than 50 true so it actually
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test out all the values which is present
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in the array one by one and uh after
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that it will exactly tell you if all the
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values comes out to be true then the
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value returned right here is true let's
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suppose if I make any sort of adjustment
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right here if I change this from 40 to
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60 so now what happens condition
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evolutes to false because 60 is not
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smaller than 50 so this condition
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evalues to false so in that case this
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becomes from True to false you'll see
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that so if any value if any value in the
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array just breaks the condition in that
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scenario it this function will return
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false in either of the cases in either
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of the elements it breaks the condition
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then it will return false for for it for
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this function to return true it needs to
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pass all the values so all the values
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must ader to the condition that you put
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right here so this can be anything this
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function can be anything anything so
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here in this case we are checking the
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ages the age must be below 50 so in our
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case this value is breaking this
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condition so that's why false is printed
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out so if I once again change it to 30
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so once again it will change from false
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to true so in this way you can actually
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use this function for condition and
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purposing in application so if you have
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a set of values that you want to check
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for a certain condition you can check
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this you can pass the function name
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inside this every function so if you
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want to test out to multiple
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conditions you can Define another
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function right here so if you I can
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say
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check
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ag2 so age must be smaller than 70 as
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well if you want to pass
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multiple functions so we can I think we
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can pass it put a comma
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so again it returns to true because uh
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age is smaller than 50 so again age is
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smaller than 70 as well because all
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these values are smaller than 70 so if I
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make some modification change from 35 to
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80 so what this happen it again changed
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to false because 80 is
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uh not smaller than 50 or
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70 so in this way you can pass multiple
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conditions multiple functions to this
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function every function this is a very
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useful function in arrays by which you
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can test out different functions on all
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the elements of the
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array so it doesn't modify the array so
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after you print out this value it
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doesn't modify the array it just test
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out conditions based upon the functions
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that you write so in this way uh thank
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you very much for watching this video if
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you do like the video please hit that
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like button subscribe the channel and do
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check out my website free mediat
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and I will be seeing you in the next
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