How to use concatenation for columns of lightning datatable.

Hi,

 public wrapp(Account acct){
        id = acct.Id;
        name = acct.Name + '-'+acct.Master_Customer_ID__c;   
        mdm = acct.Master_Customer_ID__c;     
    }

concatenateCols() {
    this.columns = [...this.columns, { label: 'fruit-weight', fieldName: 'fruitWeight' }];
    this.data = this.data.map(item => {
        return { ...item, fruitWeight: [[code]]czoxNTI6XCIke2l0ZW0ubmFtZSA/IGl0ZW0ubmFtZSA6ICYjMDM5OyYjMDM5O30keyhpdGVtLm5hbWUgJmFtcDsmYW1wOyBpdGVtLnd7WyYqJl19ZWlnaHQgPyAmIzAzOTsgLSAmIzAzOTsgOiAmIzAzOTsmIzAzOTspfSR7aXRlbS53ZWlnaHQgPyBpdGVtLndlaWdodCA6ICYjMDM5O3tbJiomXX0mIzAzOTt9XCI7e1smKiZdfQ==[[/code]] };
    });
}

I think this will help you.