how to use a loop to cap the last letter of a string

let x = "hello my name is chrono"

let reg = x.split(' ')
for(let i = 0; i < reg.length; i++) {


reg[i] = reg[i][0].toUpperCase() + reg[i].substr(1)

}
reg.join(" ")

console.log(reg)

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> The code above is to change the first letter of the string to uppercase.

The next lesson is to change the last letter instead of the first

Please help
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