Javascript - Using a string array in a loop

Question

Here's a beginner JS question. I'm making a simple app that takes the days I work, the day of the week and then alert's me if I work today.

//
var daysIWork = [
  'Wednesday',
  'Friday',
  'Saturday',
  'Sunday',
];

var dayToday = 'Saturday'; // I'll be changing this to a more advanced method, getDay? When I've figured out how to post this correctly.

for (var i = 0; i < daysIWork.length; i++) {
   console.log(daysIWork[i])
}; // This posts the array correctly, yay.

This is where I'm stuck. If I input a number that matches an array number ie [1] instead of [i], the statement will pop up true. However with the code below, it always turns out false.

if (dayToday === daysIWork[i]) {
   alert ('Noooo, you work today!');
} else {
   alert ("Yes, you don't work today!");
}

I know how to get it working using the array call [1] [2] etc but I can't get it to read a whole array and come back as true.

Thanks.

Where do you have your if? It works fine when placing it in the loop: jsfiddle — t.niese
– t.niese, Commented Feb 14, 2015 at 16:27
Rereading the question you actually want to detect if the day dayToday is within daysIWork or not. So you actually would use daysIWork.indexOf(dayToday) !== -1 to check if it is in the array. For IE 8 and before your would need to use a polyfill MSN: Array.prototype.indexOf(). — t.niese
– t.niese, Commented Feb 14, 2015 at 16:42
Ok that works but it's going through the whole array and posting. IE my 4 items, returns 3 false and 1 true which makes sense in the current code. However I just want one true and one false to come back. If dayToday and a day in the daysIWork match up post true if not post one false alert. — LoCoELF
– LoCoELF, Commented Feb 14, 2015 at 16:43

makenova · Accepted Answer · 2015-04-01 18:55:10Z

1

    var daysIWork = [
      'Wednesday',
      'Friday',
      'Saturday',
      'Sunday',
    ];

    var dayToday = 'Saturday';


    if (daysIWork.indexOf(dayToday) > 0) {
      console.log('boo');
    } else {
      console.log('yay')
    }

edited Apr 1, 2015 at 18:55

answered Apr 1, 2015 at 18:44

makenova

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