Map An Array To Create A New Array Of Pairs
I have two separate arrays and I'm trying to create a new nested array that has values grouped together. Can I use the map() method and pair each item inside the map method? There
Solution 1:
To do this, use the following
var letters = ['a','b','c'];
var numbers = [1, 2, 3];
var letterAndNumbers = letters.map((letter,index) => {
return [letter,numbers[index]];
})
And if you print it, you will receive the following output
console.log(letterAndNumbers)
[ [ 'a', 1 ], [ 'b', 2 ], [ 'c', 3 ] ]
Solution 2:
The second parameter of .map()
is Index
. Make use of it for retrieve a numbers[i]
by that iterating index:
const letters = ["a", "b", "c"];
const numbers = [1, 2, 3];
const lettersAndNumbers = letters.map((a, i) => [a, numbers[i]]);
console.log(lettersAndNumbers)
// lettersAndNumbers = [[a, 1], [b, 2], [c, 3]]
Solution 3:
I would use a map but here is a reduce just for the sake of it.
var letters = ['a', 'b', 'c'];
var numbers = [1, 2, 3];
varlettersAndNumbers = (letters, numbers) => letters.reduce((results, letter, index) => {
results.push([letter, numbers[index]]);
return results;
}, []);
console.log(lettersAndNumbers(letters, numbers));
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