'how to check the array element is empty in typescript

how to check array element is empty. its giving false. how to get the element is blank or not. in array element contains some space.

Code

let TestNumber= DATA-   -    -'
let arrStr =this.TestNumber.split(/[-]/);
if(arrStr[1]==''){
}

output -false

expected op - true;

 data - ['DATA', '   ', '    ', '']

arrays typescript

Sources

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Solution	Source