Determine if a string contains a substring within an array [NODEJS]

Question

I am attempting to create a search function which should be able to find multiple file types given various search parameters.

For example i'd like to feed my application the following filter array ['.ini', '.exe', 'dsak_'] and compare each file found against that array to determine if the filename includes one of those strings

Currently I am using the following code

for(var i = 0; i < filter.length; i++){
  if(file.includes(filter[i])) results.push(file);
}

But I was hoping to see if there was a better way to achieve this?

array.join("|") then do regex .match, but the performance stays the same. stackoverflow.com/questions/45372093/… — Jonas Wilms
– Jonas Wilms, Commented Aug 3, 2017 at 17:54
Has the performance difference been tested? I'd assume with regex that it'd have a slight advantage in larger cycles. — Kontra
– Kontra, Commented Aug 3, 2017 at 17:59
@user1893706 refer to the snippet rajesh provided ( and ive included to my answer there) — Jonas Wilms
– Jonas Wilms, Commented Aug 3, 2017 at 18:00
Better in what way? Speed to completion? Less memory use? Too many possible correct answers here. — Heretic Monkey
– Heretic Monkey, Commented Aug 3, 2017 at 18:04

Noah Freitas · Accepted Answer · 2017-08-03 18:07:56Z

1

Array.prototype.filter can help you find any files that match at least one filter and Array.prototype.some will ensure that you stop once the first matching filter is found:

var matchingFiles = files.filter(file => filters.some(filter => file.includes(filter)));

answered Aug 3, 2017 at 18:07

Noah Freitas

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Jonas Wilms · Accepted Answer · 2017-08-03 18:09:17Z

1

I think you are looking for the following code:

files.filter((file) => 
    // apply filters on files to check if it matches
     filters.some((filter) => file.includes(filter))       
)

edited Aug 3, 2017 at 18:09

Jonas Wilms

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answered Aug 3, 2017 at 18:00

Frilox

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1 Comment

Frilox Over a year ago

Yes, find is better than reduce in this case.

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