Codecademy: String Rotation

// Sample solution

// Write a string rotation method.
// It should pass all the tests given below.
String.prototype.rotate = function(number) {
    /* your code  */
    if(number===0 || number===this.length){
    return this;
    } else if(this.length>Math.abs(number)){
    if(number<0){
    number = Math.abs(number)+1;
    }
    } else if(this.length<Math.abs(number)){
    if(number>0){
    number = (Math.abs(number) % this.length)+2;
    } else {
    number = (Math.abs(number) % this.length)+1;
    }
    }
    var temp1 = this.substring(0,number-1);
    var temp2 = this.substring(number-1,this.length);
    return temp2+temp1; // return rotated string
};

/*********** Tests for your method ***********/
// The comments tell you the expected results.
// The correctness test will run all these tests, so even if you
// delete the lines below, you will still see error messages
// as long as your code doesn't pass all the tests.

console.log("ryEve".rotate(3));        // "Every"

// Zero rotation: no change
console.log("JavaScript".rotate(0));   // "JavaScript"

// Negative numbers: rotate the other way
console.log("mmerprogra".rotate(-4));  // "programmer"

// Rotate by length: no change
console.log("should".rotate(6));       // "should"
console.log("know".rotate( -4));       // "know"

// Larger than length: rotate by modulo
console.log("outab".rotate(22));       // "about"
// (actually the same as "outab".rotate(2); )
console.log("otypesprot".rotate(-36)); // "prototypes"
// (actually the same as "otypesprot".rotate(-6); )