CODEWITHSUNDEEP
javascriptsplice
Alexander McComb
Alexander McComb

Reputation: 55

Splicing a string and adding the same value for the index of the place of that value?

I think I am pretty close to figuring this one out but was getting stumped.

I am trying to splice any string taken by a function and returning that string a value added for the place it holds in the string.

function addString();

When this function recieves a value like this:

let message = "abcd";

It will return that value like this:

console.log(addString(message));
"abbcccdddd"

Upvotes: 2

Views: 124

Answers (3)

c24w
c24w

Reputation: 7866

Here's a concise solution :)

const result = 'abcd'.replace(/./g, (c, i) => c.repeat(i+1));

document.write(result);

Note: arrow functions, const and repeat come with ES6.

Upvotes: 1

Nina Scholz
Nina Scholz

Reputation: 386654

You could map the repeated value and join to a single string.

let message = "abcd",
    result = [...message].map((c, i) => c.repeat(i + 1)).join('');

console.log(result);

Upvotes: 1

Tyler Roper
Tyler Roper

Reputation: 21672

While it would've been nice to see your attempts, try this out:

function addString(str) {
    var output = "";
    str.split("").forEach(function(i, k) { //Split string up, loop through chars
        output += Array(k+2).join(str[k]);
    });
    return output;
}
    
   var myText = prompt("Enter a word.");
   alert(addString(myText));

You can create n occurrences of c using the method...

function repeatChar(n, c){
    return Array(n+1).join(c);
}

I've manipulated this logic to fit your question, in particular incrementing the array length by 2 instead of 1, so that index 0 is printed 1 time, and so-on.

Upvotes: 1

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