How do i replace all occurences of a substring with another substring in a string?

Question

I tried

str = "sampletext11111111"
str.replace("1","a")
console.log(str)

The result it gives is

sampletexta1111111

please help

Answer 1

Use replaceAll:

let str = "sampletext11111111"
str = str.replaceAll("1", "a")
console.log(str)

Answer 2

You can supply a regex and use the global modifier:

let str = "sampletext11111111"
str = str.replace(/1/g,"a")
console.log(str)