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?

• Robert Harvey: Does this answer your question? Merge/flatten an array of arrays
• Heretic Monkey: In your map statement, debug and check what s is. You'll find it's an array of two strings.

Answer 1

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)

Answer 2

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);

Answer 3

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]; }

Answer 4

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 )