add anagrams

Author: Connor Leech

udemy-interview-bootcamp-course/anagrams.js

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+// --- Directions
+// Check to see if two provided strings are anagrams of eachother.
+// One string is an anagram of another if it uses the same characters
+// in the same quantity. Only consider characters, not spaces
+// or punctuation.  Consider capital letters to be the same as lower case
+// --- Examples
+//   anagrams('rail safety', 'fairy tales') --> True
+//   anagrams('RAIL! SAFETY!', 'fairy tales') --> True
+//   anagrams('Hi there', 'Bye there') --> False
+
+function anagrams(string1, string2){
+	let sorted1 = string1.replace(/[^\w]/g, '').toLowerCase().split('').sort().join('');
+	let sorted2 = string2.replace(/[^\w]/g, '').toLowerCase().split('').sort().join('');
+
+	return (sorted1 === sorted2);
+
+}
+
+// console.log(anagrams('rail safety', 'fairy tales'));   // true
+// console.log(anagrams('RAIL! SAFETY!', 'fairy tales')); // true
+// console.log(anagrams('Hi there', 'Bye there'));        // false
+
+// Regular Expressions: 
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
+// string.replace(/[^\w]/g, "") --> removes any non-alphanumeric characters
+
+// Object.keys(obj).length      --> gets the number of keys in a JS object
+
+
+function anagramsSolution1(string1, string2){
+	let obj1 = {},
+	obj2     = {},
+	s1       = string1.replace(/[^\w]/g, '').toLowerCase().split('');
+	s2       = string2.replace(/[^\w]/g, '').toLowerCase().split('');
+
+	if(s1.length !== s2.length) return false;
+
+	s1.forEach((letter)=>{
+		obj1[letter] = (obj1[letter]) ? obj1[letter] + 1 : 1;
+	});
+
+	s2.forEach((letter)=>{
+		obj2[letter] = (obj2[letter]) ? obj2[letter] + 1 : 1;
+	});
+
+	for(var char in obj1){
+		if(obj1[char] !== obj2[char]) return false;
+	}
+
+	return true;
+}
+
+
+
+console.log(anagramsSolution1('rail safety', 'fairy tales'));   //True
+console.log(anagramsSolution1('RAIL! SAFETY!', 'fairy tales')); // True
+console.log(anagramsSolution1('Hi there', 'Bye there'));        // False
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