Let's say I have an array named derps and then I make an array inside it:
derps[0]=new Array();
how do I get/set data in the newly created array derps[0]?
5 Answers
Simply do this:
derps[0][0] = 'foo';
derps[0][1] = 'bar';
derps[0].push('foobar');
derps[0] = derps[0].concat([5,6,7]);
// Etc, etc.
console.log(derps[0][1]); // 'bar'
console.log(derps[0][2]); // 'foobar'
console.log(derps[0]); // ["foo", "bar", "foobar", "foobar", 5, 6, 7]
Basically, access derps[0] like you'd access any other array, because it is an array.
I'm not going to list All methods you can use on derps[0] ;-)
Also, instead of:
derps[0] = new Array();
You can use the "array literal" notation:
derps[0] = []; // Empty array, or:
derps[0] = ['foo', 'bar', 'foobar']; // <-- With data.
7 Comments
Zachrip
Thanks for the answer, it won't let me select you now but I will later if I remember, this is how I tried it earlier but I must've done something wrong.
Cerbrus
Maybe you made a typo or something, then ;-) Always glad to be of help!
Zachrip
how would I get the length of derps[0]?
Cerbrus
@user1420493:
derps[0].lengthZachrip
Okay, I forgot to update some code so that wasn't working when I was trying it, that's why I asked :P thanks anyways
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You can create the array with data already in it:
derps[0] = [1, 2, 3];
You can assign values to the array:
derps[0] = new Array();
derps[0][0] = 1;
derps[0][1] = 2;
derps[0][2] = 3;
You can push values to the array:
derps[0] = new Array();
derps[0].push(1);
derps[0].push(2);
derps[0].push(3);
1 Comment
bfavaretto
Good answer, you covered it all.
You can push data into the new array:
derps[0].push("some data");
As an aside: you may also use an array literal to create derps[0]:
derps[0] = [];
Comments
Easy:
var derps = [];
derps.push([]);
derps[0].push('foo');
derps[0].push('bar');
Comments
If you really wish to instantiate the type of the variable before, you can proceed this way (JSFiddle).
var derps = [];
derps[0] = [];
derps[0][0] = "test";
derps[0][1] = "test2";
document.write(derps[0][1]);
Don't forget to write var if you don't want the variable to be global.
[]instead ofnew Array();.