Array Iteration: 8 Methods - map, filter, reduce, some, every, find, findIndex, forEach
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Date: 2022-03-14
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Comments and reviews: 9
Oliver
Could this map explanation contain an error? Map doesn't return the result into the original array as it seems to be suggested here. Instead, map creates a new array and places the results in it. Which ends up having 2 arrays: three and double, respectively containing [1,2,3] and [2,4,6]. To verify this, simply add console.log(array) after console.log(double).
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Could this map explanation contain an error? Map doesn't return the result into the original array as it seems to be suggested here. Instead, map creates a new array and places the results in it. Which ends up having 2 arrays: three and double, respectively containing [1,2,3] and [2,4,6]. To verify this, simply add console.log(array) after console.log(double).
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Seth
People seem to have a hard time understanding that the functions map and filter return copies of the array with each element transformed element-wise by the callback function. Think about the difference between map and forEach and why you would use one over the other to solidify this. I'm going to start sending this video to anyone struggling with this.
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People seem to have a hard time understanding that the functions map and filter return copies of the array with each element transformed element-wise by the callback function. Think about the difference between map and forEach and why you would use one over the other to solidify this. I'm going to start sending this video to anyone struggling with this.
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mc
I must say i normally never comment on videos but this one was truly amazing. Super straight and understandable.
But where exactly is the difference between FIND and FILTER. For me FILTER is just the more versatil FIND am I right or am i missing something?
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I must say i normally never comment on videos but this one was truly amazing. Super straight and understandable.
But where exactly is the difference between FIND and FILTER. For me FILTER is just the more versatil FIND am I right or am i missing something?
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Ana
Hi!! Just wanted to say that your videos are the best! Came to this one from the Javascript beginners video and both had helped me a lot. Everything you explain is so clear! Thank you very very much! And hope you can keep working on more videos!!
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Hi!! Just wanted to say that your videos are the best! Came to this one from the Javascript beginners video and both had helped me a lot. Everything you explain is so clear! Thank you very very much! And hope you can keep working on more videos!!
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astigmatik
OMG. I didnt know about all these. Thanks! And also, I just realized I have been abusing map() when I should have done forEach() .. smh..
does the => operator work for forEach as well btw?
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OMG. I didnt know about all these. Thanks! And also, I just realized I have been abusing map() when I should have done forEach() .. smh..
does the => operator work for forEach as well btw?
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IKHLAS
I paused this video in the last minute just to comment. Your tutorials are so amazing and straightforward. I dont know how to appreciate this better
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I paused this video in the last minute just to comment. Your tutorials are so amazing and straightforward. I dont know how to appreciate this better
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Kevin
I've been looking everywhere for the .find function to actually work..and yours is the only one that worked and made complete sense....THANK YOU!
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I've been looking everywhere for the .find function to actually work..and yours is the only one that worked and made complete sense....THANK YOU!
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Emmanuel
Using the filter function, is it possible to move items to another array when they are clicked? If yes, how is it done please?
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Using the filter function, is it possible to move items to another array when they are clicked? If yes, how is it done please?
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mhmd
The simplest, shortest and best array iteration tutorial ever-
after 1 year trying finally i understand it , i can't believe
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The simplest, shortest and best array iteration tutorial ever-
after 1 year trying finally i understand it , i can't believe
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