Javascript快捷方式，将字符串附加到数组的所有值中？

Question

I have an array = ["a", "b", "c"];

What I want is i have an string let us say "Hello", that I want to append to each and every value of this array.

My expected output is something like

["Hello_a", "Hello_b", "Hello_c"]

Is there any shortcut in javascript to perform this operation, without using any loop .

Any help is appreciated !

Thanks

Answer 1

Try to use Array.prototype.map() at this context,

var yourArray = ["a", "b", "c"];
var transformed = yourArray.map(function(item){
  return "Hello_" + item;
});
console.log(transformed); // ["Hello_a", "Hello_b", "Hello_c"]

Also you can use fat Arrow functions if users of you are updated with latest browsers.

var yourArray = ["a", "b", "c"];
var transformed = yourArray.map(item => "Hello_" + item);
console.log(transformed); // ["Hello_a", "Hello_b", "Hello_c"]

As a side note, you have to sure about arrow functions that it will forcibly use lexical this inside of it.