I'm not familiar with the terminology, but I'd like to simplify it:
var topicList1 =['hello','hallo', ..., 'hej'];
var topicList2 =['a','b',...,'c'];
...
var topicList999 =['x,'y',...,'?'];
So I want to access the data like list[para1][para2], is there an existing data structure for this or do I need to create a complex function with the lists? Keep in mind that sizes of lists vary.
Arrays can be multidimensional, with each row having a different size.
var matrix = [
[1, 2, 3],
[4, 5, 6],
[7, 8, 9],
[0]
];
The variable "matrix" is an array of length 4. To access a specific value, like the number "5" in the second row, you would use:
var theFive = matrix[1][1];
You can incrementally build a matrix in JavaScript as well.
var matrix = [];
for (var i = 1; i < 10; ++i) {
var row = ~~((i - 1) / 3);
if (!matrix[row]) matrix[row] = [];
matrix[row][(i - 1) % 3] = i;
}
matrix.push([0]);
When setting values in an Array, Javascript updates the "length" property accordingly. It doesn't allocate space for null elements, so if you set element number 200 first, the array still only contains one item despite having a length of 201.
Although there isn't a specific data structure designed for this scenario, you can achieve the desired outcome by utilizing arrays in combination.
One way to approach this is by creating a jagged array, which consists of arrays within an array:
var example = [
['apple','banana','cherry','date'],
['red','blue','green','yellow'],
['alpha','beta']
];
It's interesting to note that the inner arrays can have varying lengths, hence the term "jagged."
One of the benefits of ES6 OOP is demonstrated in the following example:
class Matrix extends Array {
constructor(...rows) {
if(rows.some( r => !Array.isArray(r)))
throw new TypeError('Constructor accepts only rows as array')
super(...rows)
}
push(...rows) {
if(rows.some( r => !Array.isArray(r)))
throw new TypeError('Push method accepts array(s)')
super.push(...rows)
}
}
https://i.sstatic.net/NLFp4.png
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