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@GreggSetzer
GreggSetzer / constructor-pattern.js
Last active Mar 2, 2018
Javascript Interview Question: Constructor Pattern
View constructor-pattern.js
/*
1. Use the constructor pattern for object creation using the new keyword.
2. Each instance of the object will have its own reference to this.
3. Link functions to the object using the prototype. This provides a
performance gain because functions aren't copied into each
instance of the object. They are linked to the prototype.
It's better to have one copy of functions around, not multiple copies.
Now, if we can use ES 2015 syntax:
1. Use the class keyword.
@GreggSetzer
GreggSetzer / spiral-matrix.js
Last active Jul 7, 2018
Javascript Interview Question: Spiral Matrix
View spiral-matrix.js
/*
Draw a spiral matrix.
[ 1, 2, 3, 4]
[12, 13, 14, 5]
[11, 16, 15, 6]
[10, 9, 8, 7]
1. Initialize the multidimensional array.
2. Create counter variables to track positions.
@GreggSetzer
GreggSetzer / vowel.js
Last active Jun 26, 2019
JavaScript Interview Question: Find all Vowels in a string
View vowel.js
/*
Create a function to return the total number of vowels in a string.
Use String.prototype.match() to find matches
using a regular expression.
/[aeiou]/gi
// denotes a regex pattern.
[] instructs match() to find any of these characters.
@GreggSetzer
GreggSetzer / es6-pyramid.js
Last active Aug 3, 2018
Javascript Interview Question: Pyramid
View es6-pyramid.js
/*
This function builds a pyramid using ES6 repeat function available on the String prototype.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat
colSize: is the width of the grid in columns. Also think of it as the width of the last row in the pyramid.
level: This represents the width of the pyramid level at each iteration.
numSpaces: This represents the number of spaces to use on both sides of the pyramid.
spaces: This variable is used to cache the result of String#repeat(), no need to do the same work twice.
*/
@GreggSetzer
GreggSetzer / es6-steps.js
Last active Jul 15, 2018
Javascript Interview Question: Stairs
View es6-steps.js
/*
A simple iterative solution to building steps.
Uses String.prototype.repeat which is an ES2015 feature.
*/
function steps(n) {
for (let i = 1; i <= n; i++) {
let step = '#'.repeat(i) + ' '.repeat(n - i);
console.log(step);
}
}
@GreggSetzer
GreggSetzer / capitalize.js
Last active Feb 3, 2018
Javascript Interview Question: Title Case - Capitalize the first letter in each word of a string.
View capitalize.js
/*
Create a function that accepts a string, converts the string to title case, and
returns the result. For title case, the first letter of each word is capitalized.
capitalize('hello world'); //Outputs: 'Hello World'
captialize('the year of the hare'); //Outputs: 'The Year Of The Hare';
Pseudo code:
1. Split the string into array using str.split(' ');
2. Map over the elements in the array. Title case each word using helper function.
@GreggSetzer
GreggSetzer / anagram.js
Last active Feb 3, 2018
Javascript Interview Question: Anagram
View anagram.js
/*
Check to see if two strings are anagrams, where both strings have the same characters in the same quantity.
Only consider characters, not spaces and punctuation. Consider the strings as case insensitive, where capital
letters are the same as lowercase letters.
*/
function anagram(str1, str2) {
//Step 1: Create a data store for each string.
const charMap1 = getCharMap(str1);
const charMap2 = getCharMap(str2);
@GreggSetzer
GreggSetzer / chunked-array.js
Created Jan 30, 2018
Javascript Interview Question: Chunked Array - Given an array, create a new array containing chunked arrays of the given size.
View chunked-array.js
/*
Given an array and size, create a new array containing chunked elements with the size provided.
For example, given the array ['Alligator', 'Bear', 'Cat', 'Dog', 'Elephant', 'Flamingo', 'Giraffe'] and size 2,
return an array of arrays with 2 elements per array.
Result:
[["Alligator", "Black Bear"], ["Cat", "Dog"], ["Elephant", "Flamingo"], ["Giraffe"]]
*/
@GreggSetzer
GreggSetzer / fizz-buzz.js
Created Jan 30, 2018
Javascript Interview Question: Fizz Buzz
View fizz-buzz.js
/*
Create a function that console logs the numbers from 1 to n.
- Print "fizz" for multiples of three instead of the number.
- Print "buzz" for multiples of five instead of the number.
- Print "fizzbuzz" for numbers that are multiples of three and five instead of the number.
- Otherwise, print the number itself.
*/
function fizzBuzz(num) {
for (let i = 1; i <= num; i++) {
@GreggSetzer
GreggSetzer / max-char.js
Last active Feb 3, 2018
Javascript Interview Question: Given a string, what character appears the most?
View max-char.js
/*
Given a string, find the character that has the highest frequency.
*/
function maxChar(str) {
//Step 1: Create a data store.
let ds = {};
//Step 2: Populate it.
for (let char of str) {
You can’t perform that action at this time.