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Archive for the JavaScript Category
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | function removeDuplicates(arr) { var arrNoDupes = []; // Iterate through array passed in by parameter // and if element is NOT in array // then push element into arrNoDupes for(var i = 0; i < arr.length; i++) { if(!arrNoDupes.indexOf(arr[i])) { arrNoDupes.push(arr[i]); } } // Sort arrNoDupes into an ascending array // and assign result to arrNoDupesSorted var arrNoDupesSorted = arrNoDupes.sort(function(num1, num2) { return num1 - num2; }); return arrNoDupesSorted; } console.log(removeDuplicates([1, 2, 2, 3])); // [1, 2, 3] console.log(removeDuplicates([4,5,4,4,7,5])); // [4, 5, 7] console.log(removeDuplicates([1,2,3,5])); // [1, 2, 3, 5] |
In JavaScript, Write a Function that Returns true or false if a Number is Prime
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | function checkPrime(num) { var primeCheckerArr = []; for(var i = 2; i <= num; i++) { if(Number.isInteger(num / i)) { primeCheckerArr.push(i); } } if(primeCheckerArr.length > 1) { return false; } else { return true; } } console.log(checkPrime(9)); // false console.log(checkPrime(11)); // true |
Find the First Non-repeating Character in a String
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | var string = 'what a wonderful day it has been!'; function firstNonRepeatedChar(str) { for(var i = 0; str.length; i++) { var char = string[i]; var count = 0; for(var j = 0; j < str.length; j++) { if(str[j] === char) { count++; } } if(count === 1) { return char; } } } console.log(firstNonRepeatedChar(string)); // "o" |
Primitive Variables
Types of primitive values:
Numbers
Strings
Booleans
undefined
null
Symbol() (ES6)
confirm vs prompt
| // confirm only returns a Boolean of true or false // depending on if I click "Ok" in a popup (true) // or "Cancel" in a popup (false) var doYouLikeSush = confirm("Do you like sushi"); console.log(doYouLikeSushi); // Output is true if clicking "Ok" // or false if clicking "Cancel" // prompt returns a value // that is entered into a popup window var kindOfFoodYouLike = prompt('What kind of food do you like'); console.log(kindOfFoodYouLike); // Output is "pizza" if I put // "pizza" in pop up window |
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