CodeWars/arrayType.js at master · CharlesCreativeContent/CodeWars · GitHub

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/*
Coding in function blackAndWhite. function accept 1 parameter arr(a number array).

If arr is not an array, function should return:

"It's a fake array"
If arr contains elements 5 and 13, function should return:

"It's a black array"
If arr contains neither 5 nor 13, function should return:

"It's a white array"
Some example:

blackAndWhite(5,13) should return "It's a fake array"
blackAndWhite([5,13]) should return "It's a black array"
blackAndWhite([5,12]) should return "It's a white array"
*/

//Answer//

function blackAndWhite(arr){
 return !(Array.isArray(arr))?"It's a fake array":arr.indexOf(5)!==-1&&arr.indexOf(13)!==-1?"It's a black array":"It's a white array"
}