CODEWITHSUNDEEP
javascript
Poma
Poma

Reputation: 8484

How to generate an array filled with a few different values?

I want to generate the following array:

[3, 3, 3, 3, 4, 4, 5, 5, 5]

there are 3 different values that should repeat m, n, and k times. What is the easiest way to do that?

If I do Array(m + n + k).fill(...).fill(...).fill(...) the start and end points in later fill calls look not very straightforward.

Upvotes: 2

Views: 258

Answers (3)

mooga
mooga

Reputation: 3317

var arrValues = [3,4,5];
var arrRepeats = [4,2,3];
var arr = [];

for(var i =0; i< arrRepeats.length;i++){
  arr.push(Array(arrRepeats[i]).fill(arrValues[i]));
}
console.log(arr)

Or 

var arrValues = [3,5,4];
var arrRepeats = [4,2,3];
let arr = [];
for(var i =0; i< arrRepeats.length; i++){
  for(var j=0; j<arrRepeats[i];j++){
    arr.push(arrValues[i]);
  }
}

console.log(arr)

Or you can do that if you wanna generate arrays and combine them 

var arrValues = [3,5,4];

var arrRepeats = [4,2,3];  // m, n, k
var mainArr = [];

for(var i =0; i< arrRepeats.length; i++){
    var arr = [];
  for(var j =0; j < arrRepeats[i]; j++){

    arr.push(j);
    arr.fill(arrValues[i]);
  } 
    mainArr.push(arr);

}

    console.log(mainArr)

Upvotes: 0

Ori Drori
Ori Drori

Reputation: 192317

Create an array of values, and an array of repeat. Iterate the values with Array.map(), and return a new array filled with the values. Flatten by spreading into Array.concat():

const values = [3, 4, 5];
const repeat = [4, 2, 3];

const arr = [].concat(...values.map((v, i) => new Array(repeat[i]).fill(v)));

console.log(arr);

Upvotes: 0

smnbbrv
smnbbrv

Reputation: 24571

Generate the arrays separately and then combine them into one final array

[
  ...Array(4).fill(3), 
  ...Array(2).fill(4), 
  ...Array(3).fill(5)
]

Upvotes: 3

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