Split Array value into 2nd Array inside the current array

Question

So I have an array with the following values.

var keyVal = ["John, 2","Jane, 2", "John, 4","Jane, 5" ];

I'm trying to break out the array values into 2 it's own array so it would look like this.

var keyVal = [["John"][2],["Jane"][2], ["John"][2],["Jane"][2]];

I tried using a for loop like this:

for (var i=0; i< keyVal.length; i++ ){
                 keyVal[i].split(",");
             }

But for some reason when I go to check, nothing is changing.... What am I missing?

Thanks for your help!

May I suggest a new data structure?

Ryan
– Ryan

2014-07-16 14:43:54 +00:00
Commented Jul 16, 2014 at 14:43 — Ryan
– Ryan, Commented Jul 16, 2014 at 14:43

Danilo Valente · Accepted Answer · 2014-07-16 14:31:33Z

1

According to MDN, the .split method creates a new array with strings and doesn't affect the value of the original string, so you must update the value of each item of the array:

for (var i=0; i< keyVal.length; i++ ){
    keyVal[i] = keyVal[i].split(",");
}

answered Jul 16, 2014 at 14:31

Danilo Valente

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2 Comments

Cerbrus Over a year ago

"the .split method creates new String instances" What? You may need to clarify that a bit more.

Danilo Valente Over a year ago

@Cerbrus I meant that it creates a new array with strings and doesn't affect the value of the original string.

Cerbrus · Accepted Answer · 2014-07-16 14:31:48Z

1

You're just missing the assignment in your loop:

for (var i=0; i< keyVal.length; i++ ){
    keyVal[i] = keyVal[i].split(",");
}

This will result in:

keyVal == [["John"," 2"],["Jane"," 2"],["John"," 4"],["Jane"," 5"]]

answered Jul 16, 2014 at 14:31

Cerbrus

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1 Comment

Jason Griffith Over a year ago

Thank you so much! Too close to the forest to see the trees I suppose.

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