无法弄清楚三元条件语句

Question

I'm having some trouble figuring out this statement:

return this.savedValue ? 
        this.currentValue ? 
        this.currentValue : this.savedValue
        : this.currentValue

How would that look like in classical if else statement

Answer 1

For a better understanding you could write:

return this.savedValue
 ? (this.currentValue ? this.currentValue : this.savedValue)
 : this.currentValue   

---

if (this.savedValue) {
  if (this.currentValue) {
    return this.currentValue;
  }
  else {
    return this.savedValue;
  }
} else {
  return this.currentValue;
}