JavaScript Array concat method

A quick and efficient method to combine two or more arrays and still maintain the individual elements in the finished array.
Using unshift( ) or push( ) will add the whole array as a single element in the new array. If we wanted to add the elements individually then we would either have to use a loop and call push repeatedly OR we can use the concat( ) method and complete the same work with a single line of code.
The added benefit is that we can chain other Array methods at the end.

[ryanbooth]

What I love so much about learning javascript from these videos is I don't know how I'll be using each of these methods in the future necessarily, but I'm so excited to try them all out to make something cool. Thank you.

[rotrose]

Thank you very much, once a student gets used to your standard, I am afraid it will be a trouble for other teachers. My gratitude to you.

[RobertMcHalffey]

Did anybody else try to empty this guys trash bin?

[MEZOMEZO]

Great video, really helped me though you should have said that the sort() method converts them first to strings and then sorts them because if there was a 11 it would be put before 2 i think.

[akshattambe]

Hello experts, can anyone explain or share youtube link on how does concat() actually work behind the curtain?
Thanks in advance

[iliashterev]

In some of those cases are there any product arrays that are copy by reference. Or all are copy by value, i.e. completely different arrays.

[kushagrasamrat]

Thank you very much 😊.. please put Index number to your videos..it would be more helpful..

[zooneyl]

Why would we use a loop combined with either push or unshift, when push and unshift work perfectly on their own with a spread operator? Can we say that the 2 statements below are the same?

1. a.push (...b)
2. a.concat(b)

Thank you

[justaprogrammer]

Question: why is the 5 and 500 being treated as the same value in the sort function ?




let array = [1, 5, 3, 4, 5, 6, 7, 500, 873, 888, 900];


let newarr = array.filter(function(num){
if(num%2 == 0){
return num;
}else{
return null;
}
});
console.log(array);
console.log(newarr);


let final = newarr.concat(array);
console.log(final);
let d = final.sort();
console.log(d);

OUTPUT :
[ 1, 5, 3, 4, 5, 6, 7, 500, 873, 888, 900 ]
[ 4, 6, 500, 888, 900 ]
[ 4, 6, 500, 888, 900, 1, 5, 3, 4, 5, 6, 7, 500, 873, 888, 900 ]
[ 1, 3, 4, 4, 5, 5, 500, 500, 6, 6, 7, 873, 888, 888, 900, 900 ]