Function that filter arrays and create new array after

Question

I have to creater function ( lets call it filterItems), that will filter 2 arrays ( take all the numbers above 0) and the result should return new array with all the number above 0 from 2 arrays.

f.e input

[1, -2, 3] [1, 0]

output

[1, 3, 1]

I tried by using map, but it failed.

function filterItems(arr,array) {
return arr.map(number => arr > 0 , array > 0)
}

Thank eveyrone for their time and i will be grateful for any tips.

You can simply merge the two arrays and then filter all items > 0: const result = [...array1, ...array2].filter(item => item > 0)? — secan
– secan, Commented Jan 26, 2021 at 14:25
for exercise i have to create function called "filterItems". so i dont know if it will count ( in totally new, i know css and html, but im learning jss to uderstand what exacly going with apps). — Panasiux2
– Panasiux2, Commented Jan 26, 2021 at 14:28
It does not change anything: function filterItems(arr, array) { return [...arr, ...array].filter(item => item > 0) }. It is exactly the same concept, but you use the resulting array as a the returned value for a function instead of assigning it to a variable. — secan
– secan, Commented Jan 26, 2021 at 14:31
It has nothing to do with being smart; it is a matter of experience and familiarity with the language... [mode:grumpy-grandpa] something that you can acquire quicker, if you try a little bit harder to solve the exercises by yourself rather than giving up too quickly and looking for someone else's support.[/mode:grumpy-grandpa] ;) — secan
– secan, Commented Jan 26, 2021 at 14:36

Ele · Accepted Answer · 2021-01-26 15:08:41Z

1

You can concatenate the arrays and then filter out the numbers <= 0.

This approach is a little more extended because receives the handler for the function Array.prototype.filter.

const filterItems = (arr, array, fn = (n) => n > 0) => arr.concat(array).filter(fn);

console.log(filterItems([1, -2, 3], [1, 0]));
console.log(filterItems([1, -2, 3], [1, 0], (n) => n <= 0));

answered Jan 26, 2021 at 15:08

Ele

33.8k7 gold badges43 silver badges80 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Function that filter arrays and create new array after

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related