# [Codewars - 7kyu解題] Merge two arrays 陣列交錯合併

###### tags: `Codewars`,`7kyu`,`Javascript`,`Array`,`for-loop`,`Math.max()`

> Javascript菜鳥紀錄Codewars解題過程

## Instructions 題目
:link: https://www.codewars.com/kata/583af10620dda4da270000c5

:pushpin: **Instructions:**
Write a function that combines two arrays by alternatingly taking elements from each array in turn.

:bulb: **Examples:**

[a, b, c, d, e], [1, 2, 3, 4, 5] becomes [a, 1, b, 2, c, 3, d, 4, e, 5]

[1, 2, 3], [a, b, c, d, e, f] becomes [1, a, 2, b, 3, c, d, e, f]

:bulb: **Points:**

The arrays may be of different lengths, with at least one character/digit.
One array will be of string characters (in lower case, a-z), a second of integers (all positive starting at 1).

## :memo: My Solution 我的解法

function mergeArrays(a, b) {
var result = []
  for(let i=0;i<a.length||i<b.length;i++){
    if(i<a.length&&i<b.length){
      result.push(a[i]);
      result.push(b[i]);
      console.log(result);
    }else if(i>=a.length){
      result.push(b[i]);
    }else if(i>=b.length){
      result.push(a[i]);
    }
  }
  return result;
}

## :memo: Solutions 其他更精簡的寫法

function mergeArrays(a, b) {
  var answer = [];
  
  for (i = 0; i < Math.max(a.length, b.length); i++){
    if (i < a.length) {answer.push(a[i]);}
    if (i < b.length) {answer.push(b[i]);}
  }
  
  return answer; 
  
  
}