this is the data that I have :

and I've created 4 arrays respectevly

   public underlyingsFirstRow = [{perf:0,color:''}];
    public underlyingsSecRow = [{ perf: 0, color: '' }];
    public underlyingsThirdRow = [{ perf: 0, color: '' }];
    public underlyingsFourthRow = [{ perf: 0, color: '' }];

I want the underLyingsFirstRow to contain the first element of each of the arrays
ex [1.09,1.44,0.72,0.98,....,1.22]
and for the underlyingsSecRow [0.96,1.40,0,0.93,0,0.99,...,1.09]
since the third and fifth and the seventeenth data row has only one element and it's 0.72
I want the underlyingsSecRow to have a value of 0 indicating that there is no value there so I can use it to display some points in a graph and I want to do the same for the remaining array that I've created
this is what've wrote

this.underlyingsFirstRow.shift();
        this.underlyingsSecRow.shift();
        this.underlyingsThirdRow.shift();
        this.underlyingsFourthRow.shift();
        this.products.map(p => p.Underlyings.map((u, index,array) => {
            if (index == 0) {
                this.underlyingsFirstRow.push({ perf: (Number((u.perf100 * 100).toFixed(2))), color: u.colorPerf });

            } else if (index == 1) {
                console.log()
                if (p.Underlyings.length > 1)
                    this.underlyingsSecRow.push({ perf: (Number((u.perf100 * 100).toFixed(2))), color: u.colorPerf });
                else {
                    this.underlyingsSecRow.push({ perf: 0, color:'white' });

                }
 
            }
            else if (index == 2) {
                this.underlyingsThirdRow.push({ perf: (Number((u.perf100 * 100).toFixed(2))), color: u.colorPerf });
            }
            else if (index == 3) {
                this.underlyingsFourthRow.push({ perf: (Number((u.perf100 * 100).toFixed(2))), color: u.colorPerf });
            }
        }));

for the first array it worked since they all have at least one element

but for the others it didn't work and the length of the array got reduced ex this is underlyingsSecRow

is there a way to get the desired data ?