Added strings/wordCount

[dshubhadeep]

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[hayd]

Does (input.trim().match(/\s+/g) || []).length also work here?
(Not sure which performs better.)

[dshubhadeep]

@hayd Yeah it works, but your code is returning the (no. of words - 1). So, incrementing by 1 will result in the correct output.
I compared both the methods using Performance API. There is a negligible difference in the performance

[ry]

Thank you for the contribution but this functionality is too specific for deno_std. The criteria I'm using is whether similar functionality is found in Go's standard library.

Rather than having a wordCount, I would accept strings.fields() which should operate like this:
https://golang.org/pkg/strings/#Fields

The tests and documentation should be ported from Go: https://github.com/golang/go/blob/b41eee4c8a2fe692c1d9fb46972b9047b5dc02b7/src/strings/strings_test.go#L462-L493

[dshubhadeep]

@ry No problem. I will start working on fields implementation.

[ry]

@dshubhadeep actually I forgot we have String.split already... so I guess fields isn't necessary either.

[j-f1]

They behave differently, though.

// input:
const s = "  foo bar  baz   "
// Go:
import "strings"
strings.Fields(s) => ["foo" "bar" "baz"]

// JS
s.split()      => ["  foo bar  baz   "]
s.split("")    => [" ", " ", "f", "o", "o", " ", ..., "z", " ", " ", " "]
s.split(" ")   => ["", "", "foo", "bar", "", "baz", "", "", ""]
s.split(/\s+/) => ["", "foo", "bar", "baz", ""]

[dshubhadeep]

@ry Oh. Is there anything that needs to be added to the strings module ?

[ry]

@j-f1 @dshubhadeep Do you think it's worth it to add fields() as an alias for s.split(/\s+/).filter(x => x.length > 0) ?

[dshubhadeep]

@ry No, it just feels like an unnecessary abstraction.