Printing array values by a repeating pattern

Question

var arr = [a, b, c];

In above array, index 0 contains "a", index 1 contains "b", index 2 contains "c".

console.log(arr[0])  // will print > "a"
console.log(arr[1])  // will print > "b"
console.log(arr[2])  // will print > "b"

Is there a way so that if I want to console.log(arr[3]) then it should print "a" again, console.log(arr[4]) would be "b" and so on. If we want an index of let's say 42 like this console.log(arr[42]) then it should print any of those three string values by following the same pattern.

prasanth · Accepted Answer · 2017-05-03 05:18:38Z

3

simply use with % like this arr[value % arr.length].

var arr = ['a', 'b', 'c'];

function finding(val){
return arr[val % arr.length];
}
console.log(finding(0))
console.log(finding(1))
console.log(finding(2))
console.log(finding(3))
console.log(finding(4))
console.log(finding(5))
console.log(finding(6))
console.log(finding(42))

edited May 3, 2017 at 5:18

answered May 3, 2017 at 5:11

prasanth

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1 Comment

Devendra Lattu Over a year ago

Straightforward and elegant solution.

Ami · Accepted Answer · 2017-05-03 05:24:12Z

2

We can define our custom function which give the appropriate index

function getIndex(num){
  return num%3;/* modulo operator*/ 
}
var arr=["a","b","c"];
console.log(arr[getIndex(0)]);
console.log(arr[getIndex(1)]);
console.log(arr[getIndex(2)]);
console.log(arr[getIndex(3)]);
console.log(arr[getIndex(4)]);
console.log(arr[getIndex(5)]);
console.log(arr[getIndex(41)]);

answered May 3, 2017 at 5:24

Ami

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Comments

Jins Peter · Accepted Answer · 2017-05-03 05:16:31Z

1

We cannot have exactly what you are looking for. But what we can have what you are looking for by this

var arr = ["a","b","c"];
var printToThisIteration = function(n){
    var length = arr.length;
    for(i=0;i<n;++i)
     {
         console.log(arr[i%length])

     }
}

answered May 3, 2017 at 5:16

Jins Peter

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Comments

Tevon Strand-Brown · Accepted Answer · 2017-05-03 16:41:26Z

1

Using % you can have it repeat as many times as you like.

var arr = ['a','b','c'];

let repetitions = 5;

for(var i = 0; i < repetitions; i++){
  console.log(arr[i%3]);
}

edited May 3, 2017 at 16:41

answered May 3, 2017 at 5:18

Tevon Strand-Brown

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