Can JavaScript group a list of lists into a map like Groovy does with its groupby function?
let grouped = [['1', '44'], ['2', '55'], ['3','42']].reduce((acc, val) => {
acc[val[0]] = (acc[val[0]] || []).concat(val);
return acc;
}, {});
This would result in: { "1": [["1", "44"]], "2": [["2", "55"]], "3": [["3", "42"]] }
I'm new to JavaScript and unsure if the Rhino 1.7 R4 engine supports groupby functionality.
If you prefer using plain javascript, you have the option to iterate through the group array and assign each element to a map along with its corresponding index. Here's an example:
let group = [['apple', 'banana'], ['orange', 'kiwi'], ['grapes','mango']];
let newGroup = {};
for(let i = 0; i<group.length; i++){
newGroup[i+1] = group[i]
}
console.log(newGroup)
Typically, in JavaScript, there is usually no need for the groupby function as each element has its own index for easy access.
var data = [['1', '44'], ['2', '55'], ['3','42']];
In JavaScript, arrays are already indexed and can be accessed directly like so:
var result = data[0];
console.log(result); // ['1', '44']
If you have a specific requirement that involves grouping elements differently, please provide more details for clarity.
It's not entirely clear what your objective is here, but here is an example for reference:
let group = [['1', '44'], ['2', '55'], ['3','42']];
let newGroup = [];
for(let i = 0; i<group.length; i++){
newGroup[i+1] = group[i]
}
console.log(newGroup);
The output will remain the same as originally mentioned.
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