New to typescript so not sure how to map values inside a loop. I am running a function which does some logic which returns a number(nothing special). This function will be called in a other function to return 2 values, 1. is a number 2. is a string.
export class matrix {
public pattern!: {[key: string]: number[]};
// function will be called in a loop in a different function
public setPattern(data: number, category: string): void {
// does some logic here and set row as a value
const row = 10;// random value of course
this.pattern[category].push(row);// not working of course
}
}
//output should be like this
{
"some category": [10,55,4,53,1],
"more rows": [1,2,8]
}
On the first call, the pattern is undefined, it'll not be able to add the key to undefined this.pattern[catergory].
export class matrix {
public pattern: {[key: string]: number[]} = {};
public setPattern(data: number, catergory: string): void {
const row = 10;// random value of course
this.pattern[catergory].push(row);// not working of course
}
}
Probably not working when array is not initialized
Add this before pushing new element
if(this.pattern[category] == undefined) this.pattern[category] = []
And then after array is initialized push new element to it
this.pattern[category].push(row);
Also make sure that pattern object is initialized
public pattern!: {[key: string]: number[]}; = {}