Error: The operation cannot be performed as the specified function is invalid

Currently working on some jasmine testing in JS. I've created a testing function that looks good so far (only running the first test at the moment).

describe('Anagram', function() {

  it('no matches',function() {
    var subject = new Anagram('diaper');
    var matches = subject.matches([ 'hello', 'world', 'zombies', 'pants']);

    expect(matches).toEqual([]);
  });

Next, I have my simple function

var Anagram = function(string){
    this.word = string;
};

Anagram.prototype.matches = function(array){
    var answer = [];
    var splitWord = this.word.split('').sort();
    for(var i = 0; i < array.length; i++){
        var isAnagram = true;
        var splitItem = array[i].split('').sort();
        for(var j = 0; j < splitWord.length; j++){
            if(splitWord[j] !== splitItem[j]){
                isAnagram = false;
            }
        }
        if(isAnagram === true){
            answer.push(array[i]);
        }
    }
    return answer;
};

module.export = Anagram;

My function is designed to take a string and then analyze an array of strings to return any anagrams present. However, I keep encountering a TypeError: Anagram is not a function. I've searched for solutions and most suggestions point to semi-colons, but I believe I've used them correctly after variable and method declarations. I'd appreciate insights into what this typeError signifies, whether it is common, and what the likely causes might be.

Answer №1

If you want to determine whether two strings are anagrams of each other, you can utilize this handy function. It will evaluate to true if the strings are indeed anagrams.

function isAnagram(str1,str2){

    // Convert string to array of characters
    let arr1 = Array.from(str1);
    let arr2 = Array.from(str2);

    // Check lengths of both arrays
    let n1 = arr1.length;
    let n2 = arr2.length;

    // If lengths are different, they cannot be anagrams
    if (n1 !== n2){
        return false;
    }

    // Sort the arrays for comparison
    arr1.sort();
    arr2.sort();

    // Compare each element of the arrays
    for (let i=0; i<n1; i++ ){
        if (arr1[i] !== arr2[i]){
            return false;
        }
    }
    
    return true;
}

// Example: checking "listen" and "silent"
console.log(isAnagram("listen", "silent"));

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