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Leo Messi
Leo Messi

Reputation: 6166

Concatenate a string to each element of an array which is not null

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?

Upvotes: 2

Views: 57

Answers (5)

Mamun
Mamun

Reputation: 68933

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);

Upvotes: 3

Brian
Brian

Reputation: 5049

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);

Upvotes: 0

Nina Scholz
Nina Scholz

Reputation: 386540

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);

Upvotes: 2

Shalitha Suranga
Shalitha Suranga

Reputation: 1146

Add condition for null checking 

let a = ["name1", "name2", null, null, "name5", null];

console.log(a.map(s => s == null ? null : (s + ' wow') ));

Upvotes: 1

Stéphane Ammar
Stéphane Ammar

Reputation: 1454

Do your adding stuff only if s is not null

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

Upvotes: 1

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