Question

How to insert a character after every N characters in string with JavaScript

Answer 1

function insertChAfterEveryNCh(str, ch, n) {
    for (let i = n; i < str.length; i += n + 1) {
    	str = str.slice(0, i) + ch + str.slice(i);
    }
    		
    return str;   
    
}

let str = 'javascript java typescript c php';
let N = 4;

str = insertChAfterEveryNCh(str, '*', N);

console.log(str); 
    
    
    
    
/*
run:
    
"java*scri*pt j*ava *type*scri*pt c* php"
    
*/

 

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