JS equivalent of Python's easy way of cycling through iterables....

Question

In Python, it's fantastically easy to search for a match by cycling through things in anything that's iterable:

if letter in 'abcdef':
    print(letter)

if item in itemlist:
    print(item)

In plain JS, is there a standard pattern for looking for a match that is less verbose than something like:

for(var index = 0; index <= list.length; i += 1) {
    if(list[index] === item) {
        console.log(item);
        break;
    }
}

?

Answer 1 · 2016-04-07T03:33:05Z

April 7, 2016 3:33am

You could use the indexOf method to do that. If it returns -1, it isn't in the list. Otherwise, it tells you where in the list it is. This should work:

if(array.indexOf(thing) >= 0){
    // It's in the array
}
else{
    // It's not in the array
}

Answer 2 · 2016-04-08T21:07:30Z

April 8, 2016 9:07pm

Oh right, thank you, knew there was a better way.

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Dan Oswalt

Dan Oswalt

JS equivalent of Python's easy way of cycling through iterables....

2 Answers

Michael Hulet

Michael Hulet

Dan Oswalt

Dan Oswalt