function is returning value ,result is showing undefined [duplicate]

Question

Hi I have tried this function .This function will give be row number till 'b' exist in same column

var arr= ['abc','tbu','iop'];

var getPositionbyRow = function(row, col) {
if(arr[row][col]!=='b') {
        return row;
    }

    getPositionbyRow(row+1,col);
}
var  r = getPositionbyRow(0,1);

but value of r is always undefined. can someone help me to understand why its happening. Thanks for help.

Please do not update question based on suggestions in answer/comments. This makes them void — Rajesh Dixit
– Rajesh Dixit, Commented Feb 9, 2018 at 6:48

nemo · Accepted Answer · 2018-02-09 06:47:39Z

1

In order for your recursive function to work you should return getPositionbyRow(row+1,col);

Also it is a good practise to add a condition when 'b' is not present in your array, and return -1 for example. That way you will avoid endless loops

answered Feb 9, 2018 at 6:47

nemo

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1 Comment

Roli Agrawal Over a year ago

Thanks realized mistake.

Some programmer dude · Accepted Answer · 2018-02-09 06:47:31Z

0

You only return something if arr[row][col]!=='b'. Otherwise you return nothing.

You need to

return getPositionbyRow(row+1,col);

answered Feb 9, 2018 at 6:47

Some programmer dude

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1 Comment

Roli Agrawal Over a year ago

Thanks realized mistake.

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