How do you convert a blank string to a number? #javascript

How do you convert a blank string to a number?
#javascript #coding #tutorial #number

***SAMPLE FUNCTION:
function strToNum(x,z) {

let sum = Number(x) + Number(z)
let sum2 = parseInt(x) + parseInt(z)
// sum = 3
// sum2 = NaN

}
// use Number() method

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