Question

How to add prefix to array of strings in JavaScript ES6

Answer 1

class Ctest {
  constructor(prefix) {
      this.prefix = prefix;
  }
  addPrefix(arr) {
      return arr.map(s => this.prefix + s); 
  }
}

const obj = new Ctest('An ')
       
const arr  = ['object', 'apple'];

console.log(obj.addPrefix(arr));



 
/*
run:
      
[ 'An object', 'An apple' ]
 
*/

 

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Answer 2

const prefix = 'An '
       
let arr  = ['object', 'apple'];

arr = arr.map(s => prefix + s); 

console.log(arr);



 
/*
run:
      
[ 'An object', 'An apple' ]
 
*/

 

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