create a repeat string by a string.

repeat.js

define(function() {
    
    /**
     * create a repeat string by a string
     * 
     * @param {string} str target string
     * @param {number} count repeat count
     * @return {string}
     */
    function repeat( str, count ) {
        return count < 1 ? str : new Array( count + 1 ).join( str );
    }
    
    return repeat;

});

repeat2.js

define(function() {
    
    /**
     * create a repeat string by a string
     * 
     * @param {string} str target string
     * @param {number} count repeat count
     * @return {string}
     */
    function repeat( str, count ) {
        var rs = str;
        
        count = count || 0;
        while ( count-- > 0 ) {
            rs += str;
        }
        
        return rs;
    }
    
    return repeat;

});

repeat3.js

define(function() {
    
    /**
     * create a repeat string by a string
     * 
     * @param {string} str target string
     * @param {number} count repeat count
     * @return {string}
     */
    function repeat( str, count ) {
        var rs = [ str ];
        
        count = count || 0;
        while ( count-- > 0 ) {
            rs.push( str );
        }
        
        return rs.join( '' );
    }
    
    return repeat;

});