Conditional array formatting in JavaScript

Question

I have an array with text strings:

var myarray = ["valueA","valueB","valueC","valueD/valueA","valueE","valueC/valueA"];

Some of the values in the array have a slash, e.g. "aaa/bbb". The slash have a special meaning of separating two values.

I want to get a new array with one value or the other based on a boolean function.

For example:

var myarray = ["valueA/valueB"];
var myNewarray = myFunction(myarray, true); // myNewarray == ["valueA"]
var myNewarray2 = myFunction(myarray, false); // myNewarray2 == ["valueB"]

myarray = ["valueA/valueC","valueB","valueD/valueF"];
myNewarray = myFunction(myarray, true); // ["valueA","valueB","valueD"]
myNewarray = myFunction(myarray, false); // ["valueC","valueB","valueF"]

Does the fiddle link have anything to do with your question?! — lonesomeday
– lonesomeday, Commented Nov 17, 2014 at 14:41
Yes i want chose value with time if i have even week i chose value 1 if odd i chose value 2 ( myarray = [value1/value2]) — Andrius Mozuraitis
– Andrius Mozuraitis, Commented Nov 17, 2014 at 14:44

pawel · Accepted Answer · 2014-11-17 14:49:55Z

1

Use Array.map to call a function on each item and return another value depending on some conditions.

var cond = false;
var myarray = ["valueA/valueC","valueB","valueD/valueF"];
var myNewarray = myarray.map( function(item){
    var values = item.split('/');
    if( values.length == 2 ){
        return cond ? values[0] : values[1];
    }
    else {
        return item;
    }
});

http://fiddle.jshell.net/duw99072/

answered Nov 17, 2014 at 14:49

pawel

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Comments

pete · Accepted Answer · 2014-11-17 14:47:19Z

1

Just loop through your array and .split() on the slash if the element contains it:

Assuming you want the value of oddWeek (in your fiddle) to determine the left/right value of the slash-separated array elements:

var myarray = ["valueA/valueC","valueB","valueD/valueF"];
myarray.forEach(function (val, index, array) {
    if (val.indexOf('/') > -1) {
        val = val.split('/')[oddWeek];
    }
    output += '<p>' + val + '</p>'
});

Updated fiddle: http://fiddle.jshell.net/r1hvbjs5/2/

answered Nov 17, 2014 at 14:47

pete

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Comments

Marlon Bernardes · Accepted Answer · 2014-11-17 14:55:16Z

1

You could use Array.prototype.map - it creates a new array with the results of calling a provided function on every element in this array.

Considering your variable is named condition:

myarray.map(function(el){
 return el.indexOf('/') > -1 ? el.split('/')[condition ? 0 : 1] : el;
});

answered Nov 17, 2014 at 14:55

Marlon Bernardes

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