I have a Record<string, number[][]> and trying to perform calculation over these values.
An example input:
const input1 = {
key1: [
[2002, 10],
[2003, 50],
],
};
const input2 = {
key1: [
[2002, 20],
[2003, 70],
],
};
const input3 = {
key1: [
[2002, 5],
[2003, 60],
],
};
For each key, and for the specific year I want to do the following
year => input1 + input2 - input3
// output: 2002 => 25, 2003 => 60
For this I have been playing around with lodash/fp.
map(a => a.map(nth(1)))(map('key1')([input1, input2]))
// [[10, 50], [20, 70], [5, 60]]
is there a way to somehow pass the inputs and iterate over them, and somehow get a callback function to get the values to perform the calculation.
I tried zip, zipWith but didn’t get to anywhere with them.
Any clue what I can do in this instance?
Thank you for your help.
You could get an object with _.fromPairs method and then use _.mergeWith to add and subtract.
const input1 = {
key1: [
[2002, 10],
[2003, 50],
],
};
const input2 = {
key1: [
[2002, 20],
[2003, 70],
],
};
const input3 = {
key1: [
[2002, 5],
[2003, 60],
],
};
const [one, two, three] = _.map([input1, input2, input3], ({key1 }) => _.fromPairs(key1))
const add = _.mergeWith(one, two, (a, b) => a + b)
const sub = _.mergeWith(add, three, (a, b) => a - b)
console.log(add)<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js"></script>