var nice = new String("ASH");
nice; //String {0: "A", 1: "S", 2: "H", length: 3, [[PrimitiveValue]]: "ASH"}
var reverseNice = Array.prototype.reverse.call(nice);
reverseNice.toString(); // "ASH"
whereas I was expecting reverseNice to be "HSA".
3 Answers
You can't make changes to nice, try it;
nice[0] = 'f';
nice[0]; // "A"
If you wanted to use the Array method, convert it to a true Array first
var reverseNice = Array.prototype.slice.call(nice).reverse(); // notice slice
reverseNice.join(''); // "HSA", notice `.join` not `.toString`
Why not do this?
var nice = "ASH".split("");
nice; //Array {0: "A", 1: "S", 2: "H", length: 3}
var reverseNice = nice.reverse();
reverseNice.join("").toString(); // "HSA"
or just
var nice = "ASH".split("");
var reverseNice = nice.reverse().join("").toString();
1 Comment
Norman Breau
If you use
split() then this returns an Array object itself. Therefore you don't need Array.prototype.reverse.call(nice);. You just need var reverseNice = nice.reverse(). You also don't need toString() after the join, since join returns a string.use the split and join to convert type from string to array , just like this .
var nice = new String("ASH");
// create a string
var result = Array.prototype.reverse.call(nice.split('')).join('');
// string can not use the reverse,
// so we need split it and call the prototype function of Array ,
// and join the result in the end
console.log(result)
Comments
new String()will return only string object not primitive string. For that use "".