Javascript -transform an array of strings into a list of strings

Question

I need to find a way to transform var input =["tag1", "tag2", "tag3"] so that it becomes "tag1", "tag2", "tag3"

At the end I should have var output = "tag1", "tag2", "tag3" enter code here

I tried push, splice, join...nothing worked.

Some words on why: It can seem weird but I need to use some third party tool querying convention

object.containsAll('activities', 'tag1', 'tag2', 'tag3')

So the query is failing because I can't write object.containsAll('activities', input), as input here is an array

I know...that's why i added the "some words on why".I need to have a query that takes the items of the array to make: object.containsAll('activities', 'tag1', 'tag2', 'tag3') — Mathieu
– Mathieu, Commented Sep 4, 2018 at 22:30

CertainPerformance · Accepted Answer · 2018-09-04 22:34:23Z

3

Why not spread the input array into the argument list, no transformation needed?

object.containsAll('activities', ...input);

Or, without spread:

const argumentsArr = input.slice(); // avoid mutating the original array
argumentsArr.unshift('activities');
object.containsAll.apply(object, argumentsArr);

edited Sep 4, 2018 at 22:34

answered Sep 4, 2018 at 22:31

CertainPerformance

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6 Comments

Mathieu Over a year ago

I don't know this ... => what's the name of this technique

Attersson Over a year ago

@Mathieu => is the lambda, but it is not really related to the question. Or perhaps you mean the ... it is the spread operator.

mwilson Over a year ago

@Mathieu: See this: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…

Mathieu Over a year ago

wow never knew this thing. thanks i'll try this out and will read more about these techniques

Sebastian Simon Over a year ago

@Mathieu Just read What does this symbol mean in JavaScript? and the documentation on MDN about expressions and operators.

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