将字符串连接到非空的数组的每个元素

Question

I have an array like this: ["name1", "name2", null, null, "name5", null]

I want to make it like this:

["name1 wow", "name2 wow", null, null, "name5 wow", null]

I tried to do it like this:

myCtrl.myArray.map(s => s + " wow");

Seems it's not the right solution, any ideas?

Answer 1

Try Aarry's map() with the help of ternary operator like the following:

 var arr = ["name1", "name2", null, null, "name5", null]; var res = arr.map(function(item){ return item != null ? item + ' wow' : null; }); console.log(res); 

Answer 2

You could use a logical AND && for checking falsy values and return the falsy value direcly or concat the value with a postfix.

You need to assign the result array of Array#map to a new or the old variable.

 var array = ["name1", "name2", null, null, "name5", null], result = array.map(s => s && s + " wow"); console.log(result); 

Answer 3

只有当s不为空时才进行添加

myCtrl.myArray.map(s => (s==null?null:s + " wow"));

Answer 4

Add condition for null checking

 let a = ["name1", "name2", null, null, "name5", null]; console.log(a.map(s => s == null ? null : (s + ' wow') )); 

Answer 5

For the sake of completeness, you don't actually have to compare to null :

var arr = ["name1", "name2", null, null, "name5", null];
var res = arr.map(function(item) {
  return item ? item + ' wow' : null;
});
console.log(res);