return length string in javascript when string inside in array

Question

I have an array as follows:

var str_array=["hello","world"]

How to get length of string when string are there in array? I just want to get length of string "hello" and then "world" inside a loop. This is what I've tried:

for (var i=0; i<= str_array[0].length; i++){
  alert(str_array[i].starAt(i)); 
 }

I get error message

TypeError: Cannot read property 'length' of undefined

Rayon · Accepted Answer · 2015-08-29 18:14:10Z

2

Try this:

var str_array = ["hello", "world"];
for (var i = 0, len = str_array.length; i < len; i++) {
  alert('Length of ' + str_array[i] + ' is ' + str_array[i].length);
}

answered Aug 29, 2015 at 18:14

Rayon

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2 Comments

Rayon Over a year ago

Its a variable, used just for optimization purpose. I dont want length to be calculate every time loop is iterated..

Alimin Over a year ago

can you help me to directly analyzing my code in this forum coderbyte.com/CodingArea/… actually i am trying to finish number 4 challenges to make simple encryption with my own algorhytm?

brroshan · Accepted Answer · 2015-08-29 18:40:28Z

1

How about this:

str_array.forEach(function(e){ alert("Length = " + e.length) });

You could also use map to get the length out of each element:

var lengths = str_array.map(function(e){ return e.length });

answered Aug 29, 2015 at 18:40

brroshan

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