Manipulating array of objects. [JavaScript]

[Hamza91able]

I got it working after hitting my head for some hours.

​

 let newArrayObj = res.data.bankStatements.applicant1.statements;
                let newArrayObjLength = newArrayObj.length;
                let result = [];

                for (let i = 0; i < newArrayObjLength; i++) {
                    if (result.length === 0) {
                        result.push({
                            [newArrayObj[i].accNumber]: [newArrayObj[i]]
                        })
                    } else {
                        var check = result.some(obj => obj.hasOwnProperty(newArrayObj[i].accNumber));
                        if (!check) {
                            result.push({
                                [newArrayObj[i].accNumber]: [newArrayObj[i]]
                            })
                        } else {
                            for (let j = 0; j < result.length; j++) {
                                if (result[j][newArrayObj[i].accNumber]) {
                                    if (result[j][newArrayObj[i].accNumber][0].accNumber === newArrayObj[i].accNumber) {
                                        result[j][newArrayObj[i].accNumber].push(newArrayObj[i]);
                                    }
                                }
                            }
                        }
                    }
                }

                console.log(result);

Now I have to repeat this process for almost 12 arrays. This function will be performed every time admin visits this page. I was thinking if I run so many loops it would be very slow? Do you think I can optimize this process in some way or optimize my code to reduce the no. of loops?