Adding text to beginning of each array element

Question

I have an array which contains the contents as follows:

["ZS125-48ATab", "STR125YBTab", "KS125-24Tab", "ZS125-50Tab", "DFE125-8ATab", "ZS125-30Tab", "HT125-8Tab", "HT125-4FTab", "STR50Tab"]

Is it possible to append a # symbol to the front of each element in the array.

Thanks.

nash.pro · Accepted Answer · 2015-10-13 07:58:15Z

66

Example for ES6

var arr = ['first', 'second', 'third'];    
arr = arr.map(i => '#' + i);

Result:

console.log(arr); // ["#first", "#second", "#third"]

edited Oct 13, 2015 at 7:58

answered Oct 12, 2015 at 11:17

nash.pro

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1 Comment

SuperBiasedMan Over a year ago

Please consider editing your post to add more explanation about what your code does and why it will solve the problem. An answer that mostly just contains code (even if it's working) usually wont help the OP to understand their problem.

Fibonacci · Accepted Answer · 2013-12-10 15:30:42Z

30

for(var i=0;i<array.length;i++){
    array[i]="#"+array[i];
}

answered Dec 10, 2013 at 15:30

Fibonacci

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1 Comment

Bill Somen Over a year ago

` array.forEach(item => { item = "#" + item }) `

adeneo · Accepted Answer · 2013-12-10 15:29:49Z

21

Iterate over the array and just add #

var arr = [your array];

for (var i=arr.length; i--;) {
    arr[i] = '#' + arr[i];
}

FIDDLE

In newer browsers you could do

arr = arr.map(function(e) {return '#' + e});

answered Dec 10, 2013 at 15:29

adeneo

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6 Comments

georg Over a year ago

I can understand when newcomers do that, but I don't think high-rep users should answer "questions" like this. A closevote (+ a friendly "what have you tried" comment) would be a way more helpful.

adeneo Over a year ago

@thg435 - seems like a legitimate question to me, even if it's not something that's really hard to do, or figure out with a little trial and error.

georg Over a year ago

"Questions asking for code must demonstrate a minimal understanding of the problem being solved. Include attempted solutions, why they didn't work, and the expected results."

adeneo Over a year ago

@thg435 - That is true, and if you feel it should be closed, vote for that, that's up to you.

georg Over a year ago

Of course I did, and downvoted yours. "Gimme some codez" questions as well as "gimme some repz" answers don't belong here.

|

Ashok Raj · Accepted Answer · 2018-06-23 17:48:39Z

12

Simple & sweet in ES6 as,

array.map((line) => `#${line}`);

answered Jun 23, 2018 at 17:48

Ashok Raj

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Comments

score 2 · Accepted Answer · 2013-12-13 10:18:24Z

2

You can do it like this :

array = ('#' + array.join('#')).match(/#[^#]*/g) || []; // null || []

The following trick works as well, but I wonder why split ignores the first sharp...

array = ('#' + array.join('#')).split(/(?=#)/);

Indeed, I rather expected this scenario : "#a#b#c" -> ["", "#a", "#b", "#c"].

Anyway, I prefer the second method since match returns null in case of failure.

edited Dec 13, 2013 at 10:18

answered Dec 10, 2013 at 15:38

user1636522

1 Comment

user1636522 Over a year ago

@acostache Trickier but probably more expensive :-)

tewathia · Accepted Answer · 2013-12-10 15:31:37Z

1

Use the forEach method(reference)

var array = ["ZS125-48ATab", "STR125YBTab", "KS125-24Tab", "ZS125-50Tab", "DFE125-8ATab", "ZS125-30Tab", "HT125-8Tab", "HT125-4FTab", "STR50Tab"];
array.forEach(function(element, index) {
    array[index] = '#' + element;
});

answered Dec 10, 2013 at 15:31

tewathia

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Comments

Nouphal.M · Accepted Answer · 2013-12-10 15:32:32Z

1

The following code would do the job:

var t = ["ZS125-48ATab", "STR125YBTab", "KS125-24Tab", "ZS125-50Tab", "DFE125-8ATab", "ZS125-30Tab", "HT125-8Tab", "HT125-4FTab", "STR50Tab"];

    for(var i=0;i<t.length;i++){
        t[i] = "#"+t[i];   
    }

See demo here

answered Dec 10, 2013 at 15:32

Nouphal.M

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