create a new array from array of arrays

Question

I have this array of arrays:

let a = [

["i was sent", "i do"],
["i was sent", "i sent"],
["to protect you", "to find you"]

]

And I want to return this single array from it:

b = ["i was sent = i do", "i was sent = i sent", "to protect you = to find you"]

How can I do that?

I have tried to use a map like let b = a.map(s => s + ' = '); but it won't do the job?

Does this answer your question? [Merge/flatten an array of arrays](https://stackoverflow.com/questions/10865025/merge-flatten-an-array-of-arrays) — Robert Harvey, May 29 '20 at 17:37
In your `map` statement, debug and check what `s` is. You'll find it's an array of two strings. — Heretic Monkey, May 29 '20 at 17:38

score 3 · Accepted Answer · edited May 29 '20 at 17:49

3

let a = [
  ["i was sent", "i do"],
  ["i was sent", "i sent"],
  ["to protect you", "to find you"]
]

let result = a.map(x => x.join(" = "))
console.log(result)

edited May 29 '20 at 17:49

Unmitigated

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answered May 29 '20 at 17:39

Paul

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score 1 · Answer 2 · answered May 29 '20 at 17:39

1

Assuming your inner arrays always have two elements:

let a = [

["i was sent", "i do"],
["i was sent", "i sent"],
["to protect you", "to find you"]

]

let b = a.map(el => `${el[0]} = ${el[1]}`);

console.log(b);

answered May 29 '20 at 17:39

Balastrong

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score 1 · Answer 3 · answered May 29 '20 at 18:00

1

You could use a for loop to iterate through the array, and joining each of the 2nd dimensional arrays. You could use something like this:
for(var i = 0 ; i < array.length ; i++) { array[i] = array[i][0] + " = " + array[i][1]; }

answered May 29 '20 at 18:00

cs1349459

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Mister Jojo · Answer 4 · 2020-05-29T21:56:44.397

1

mine...

let a = 
    [ [ "i was sent", "i do"] 
    , [ "i was sent", "i sent"] 
    , [ "to protect you", "to find you"] 
    ] 

const jojo=([x,y])=>x+' = '+y

let b = a.map(jojo)

console.log ( b )

edited May 29 '20 at 21:56

answered May 29 '20 at 18:08

Mister Jojo

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create a new array from array of arrays

4 Answers4