如何遍历数组以获取每个字符串的第一个字符

Question

I'm working on extracting the first letter of the word to form an acronym. I have an array to store all the Capticalized words and what I need to do is to get those Capitalized characters.

I used array reduce() method to get the capital letter. But I would like to get all the acronyms formed by different numbers of the capital letter.

var words = ["In", "American", "Broadcast", "Company"];

var output = words.reduce((acronym, word) => {
  acronym += word.charAt(0);
  return acronym;
}, "");

This will produce an output IABC , but we know the correct acronym is ABC , so I am thinking can we get C, BC, ABC, IABC in an iteration and then get the correct acronym ABC ?

Answer 1

To achieve expected result, use below option of reversing array and using reduce with unshift array method

1. Reverse array using .reverse()
2. Loop using reduce and add first character to beginning on every iteration
3. Join on every iteration and push to result array

working code sample for reference

 var words = ["In", "American", "Broadcast", "Company"]; var result = [] var output = words.reverse().reduce((acronym, word, i) => { acronym.unshift(word.charAt(0)) result.push(acronym.join("")) return acronym; }, []); console.log("result", result); 

codepen - https://codepen.io/nagasai/pen/voXXYO?editors=1010