Javascript Interview Question String Check String rotation

Introduction

Write an function to detect whether two Strings are rotations of each other.

for example: StarWars is a rotation of arsStarW 


function isRotation(str1, str2) {
    //your code
}
console.log( isRotation('Star Wars', 'arsStar W' ) );
console.log( isRotation('Star Wars', 'Clone Wars') );




/**
 * @function {public static} isRotation
 *
 * Cheks whether two `String`s are rotations of each other.
 *
 * @param {String} str1 - First `String` to check.
 * @param {String} str2 - Rotation `String` to check.
 *
 * @return `true` if str1 is a rotation of str2; `false` otherwise.
 */
function isRotation(str1, str2) {
    var len1 = str1.length;
    var len2 = str2.length;

    if (len1 !== len2) {
        return false;
    }

    return str1.concat(str1).indexOf(str2) > -1;
}
console.log( isRotation('Star Wars', 'arsStar W' ) );
console.log( isRotation('Star Wars', 'Clone Wars') );

/*
Output: ($ /usr/bin/node 014.js)
true
false
*/



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