Convert comma seperated values into object specified method

Hi I am trying to achieve following behaviors with javascript

let fieldsArray = ['clientMap', 0, 'legalEntityNumber']

somehow I want to get convert above data into following way

['clientMap'][0]['legalEntityNumber']

I tried with fieldsArray.join('[]') but its not working as expected. please help. Thanks

>Solution :

If im understanding you correctly (and you want a string i.e. "[clientMap][0][legalEntityNumber]") this would be how to do that…

let fieldsArrayString = ['clientMap', 0, 'legalEntityNumber'].map(item=>`[${item}]`).join('');

or

let fieldsArrayString = ['clientMap', 0, 'legalEntityNumber'].reduce((acc, cur) => `${acc}[${cur}]`, '');