Array within an Array to single Array

Question

var value = [{
    "rowid": "one, two, three"
}, {
    "rowid": "four"
}]

var selected = value.map(function(varId) {
    return varId.rowid.toString();
});
console.log(selected);
console.log(selected.length);

The Output I'm getting is

["one, two, three", "four"]
2

But I'm expecting

["one", "two", "three", "four"]
4

How can this be done?

Just a quick note - what you have is an array of objects, not a multi-dimensional array. — Chris Pickford
– Chris Pickford, Commented Mar 8, 2016 at 15:06
Not sure about syntax but the logic should be something like: console.log(selected.split(',').length); — Eray Balkanli
– Eray Balkanli, Commented Mar 8, 2016 at 15:09

Nina Scholz · Accepted Answer · 2016-03-08 15:14:50Z

3

Use String#split() and Array#reduce():

var value = [{ "rowid": "one, two, three" }, { "rowid": "four" }],
    selected = value.reduce(function (r, a) {
        return r.concat(a.rowid.split(', '));
    }, []);

document.write('<pre>' + JSON.stringify(selected, 0, 4) + '</pre>');

edited Mar 8, 2016 at 15:14

answered Mar 8, 2016 at 15:08

Nina Scholz

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Comments

whd · Accepted Answer · 2016-03-08 15:07:39Z

0

As mentioned in comment it is array of objects not array of arrays anyway try return varId.rowid.toString().split(',');

answered Mar 8, 2016 at 15:07

whd

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Comments

PostCrafter · Accepted Answer · 2016-03-08 15:14:13Z

0

You will have to split your first string by the comma (', '), afterwards flatten the multidimensional array.

var value = [{
    "rowid": "one, two, three"
}, {
    "rowid": "four"
}];

var selected = value.map(function(varId) {
    return varId.rowid.toString().split(', ');
});    
// [ [ 'one', 'two', 'three' ], [ 'four' ] ]
selected = [].concat.apply([], selected);
// [ 'one', 'two', 'three', 'four' ]
console.log(selected);
console.log(selected.length);

answered Mar 8, 2016 at 15:14

PostCrafter

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Comments

Pavol · Accepted Answer · 2016-03-08 15:20:43Z

0

Try this:

var sel = value.map(function(varId) {
    var rowId = varId.rowid.toString();
    var splitted = rowId.split(",");    
    return splitted;
});
var arrayOfStrings = [].concat.apply([], sel);
for (int i = 0; i < arrayOfStrings.length; i++){
   arrayOfStrings[i] = arrayOfStrings[i].trim();
}

edited Mar 8, 2016 at 15:20

answered Mar 8, 2016 at 15:14

Pavol

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