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Commit 8b13076

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‎arithmetic-operators.js‎

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a * (b + c) // grouping
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person.age // member
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person[age] // member
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!(a == b) // logical not
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a != b // not equal
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typeof a // type (number, object, function...)
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x << 2 x >> 3 // minary shifting
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a = b // assignment
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a == b // equals
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a != b // unequal
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a === b // strict equal
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a !== b // strict unequal
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a < b a > b // less and greater than
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a <= b a >= b // less or equal, greater or eq
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a += b // a = a + b (works with - * %...)
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a && b // logical and
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a || b // logical or

‎array-methods.js‎

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var dogs = ["Bulldog", "Beagle", "Labrador"];
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var dogs = new Array("Bulldog", "Beagle", "Labrador"); // declaration
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alert(dogs[1]); // access value at index, first item being [0]
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dogs[0] = "Bull Terier"; // change the first item
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for (var i = 0; i < dogs.length; i++) { // parsing with array.length
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console.log(dogs[i]);
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}
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dogs.toString(); // convert to string: results "Bulldog,Beagle,Labrador"
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dogs.join(" * "); // join: "Bulldog * Beagle * Labrador"
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dogs.pop(); // remove last element
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dogs.push("Chihuahua"); // add new element to the end
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dogs[dogs.length] = "Chihuahua"; // the same as push
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dogs.shift(); // remove first element
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dogs.unshift("Chihuahua"); // add new element to the beginning
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delete dogs[0]; // change element to undefined (not recommended)
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dogs.splice(2, 0, "Pug", "Boxer"); // add elements (where, how many to remove, element list)
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var animals = dogs.concat(cats,birds); // join two arrays (dogs followed by cats and birds)
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dogs.slice(1,4); // elements from [1] to [4-1]
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dogs.sort(); // sort string alphabetically
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dogs.reverse(); // sort string in descending order
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x.sort(function(a, b){return a - b}); // numeric sort
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x.sort(function(a, b){return b - a}); // numeric descending sort
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highest = x[0]; // first item in sorted array is the lowest (or highest) value
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x.sort(function(a, b){return 0.5 - Math.random()}); // random order sort
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/* More Array Methods */
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// Accessing Elements I
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a1.concat(a2) // Return new array by joining arrays a1 and a2 together
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a1.join(separator) // Join all elements of array a1 into a string separated by separator arg
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a1.slice(start, end) // Extract a section from start to end of array a1 and return a new array
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a1.indexOf(obj) // Return first index of obj within array a1
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a1.lastIndexOf(obj) // Return last index of obj within array a1
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// Iterating I
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a1.forEach(fn) // Calls function fn for each element in the array a1
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a1.every(fn) // Return true if every element in array a1 satisfies provided testing function fn
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a1.some(fn) // Return true if at least one element in array a1 satisfies provided testing function fn
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a1.filter(fn) // Create a new array with all elements of array a1 which pass the filtering function fn
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// Iterating II
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a1.map(fn) // Create a new array with results of calling function fn on every element in array a1
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a1.reduce(fn) // Apply a function fn against an accumulator and each value (from left to right) of the array as to reduce it to a single value
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a1.reduceRight(fn) // Apply a function fn against an accumulator and each value (from right to left) of the array as to reduce it to a single value
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// Mutating I
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a1.pop() // Remove and return last element from array a1
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a1.push(obj) // Add obj to end of array a1 and return new length
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a1.reverse() // Reverse order of elements of array a1 in place
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a1.sort() // Sort the elements of array a1 in place
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a1.splice(start, deleteCount, items) // Change content of array a1 by removing existing elements and/or adding new elements
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a1.unshift(obj) // Add obj to start of array a1 and return new length
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// General I
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a1.toString() // Return a string representing array a1 and its elements (same as a1. join(','))
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a1.toLocaleString() // Return a localized string representing array a1 and its elements (similar to a1.join(','))
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Array.isArray(var) // Return true if var is an array
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a1.length // Return length of array a1
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a1[0] // Access first element of array a1

‎data-types.js‎

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var age = 18; // number
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var name = "Jane"; // string
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var name = { first: "Jane", last: "Doe" }; // object
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var truth = false; // boolean
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var sheets = ["HTML", "CSS", "JS"]; // array
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var a;
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typeof a; // undefined
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var a = null; // value null
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false, true; // boolean
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18, 3.14, 0b10011, 0xf6, NaN; // number
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"flower", "John"; // string
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undefined, null, Infinity; // special

‎if-else.js‎

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var age = 23;
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var status = "N/A";
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if (age < 0) {
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// logical condition
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status = "Please enter a valid age"; // executed if condition is true
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} else if (age >= 0 && age <= 3) {
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// else if block comes next
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status = "Toddler";
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} else if (age >= 4 && age <= 12) {
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status = "Kid";
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} else if (age >= 13 && age <= 17) {
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status = "Teenager";
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} else if (age >= 18 && age <= 39) {
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status = "Young Adult"
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} else if (age >= 40 && age <= 59) {
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status = "Middle Aged Adult";
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} else (age >= 60) {
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// Executed if all other conditions fail
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status = "Old and Senior Citizen"
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}

‎js-global-functions.js‎

Whitespace-only changes.

‎string-methods.js‎

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var abc = "abcdefghijklmnopqrstuvwxyz";
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var esc = 'I don\'t \n know'; // \n new line
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var len = abc.length; // string length
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abc.indexOf("lmno"); // find substring, -1 if doesn't contain
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abc.lastIndexOf("lmno"); // last occurance
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abc.slice(3, 6); // cuts out "def", negative values count from behind
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abc.replace("abc","123"); // find and replace, takes regular expressions
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abc.toUpperCase(); // convert to upper case
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abc.toLowerCase(); // convert to lower case
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abc.concat(" ", str2); // abc + " " + str2
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abc.charAt(2); // character at index: "c"
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abc[2]; // unsafe, abc[2] = "C" doesn't work
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abc.charCodeAt(2); // character code at index: "c" -> 99
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abc.split(","); // splitting a string on commas gives an array
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abc.split(""); // splitting on characters
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128.toString(16); // number to hex(16), octal (8) or binary (2)
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/* More Strings Methods */
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var str = "Hello World";
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var str1 = "United States of America";
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var str2 = "states";
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// Basics I
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str.length // Return length of string str
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str[n] // Return nth character of string str
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str.charAt(index) // Return character in string str at specified index
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str.toLowerCase() // Convert string str to lower case
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str.toUpperCase() // Convert string str to upper case
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// General I
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str.indexOf(substr) // Return first index within string str of substring substr
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str.split(separator) // Split string str into an array of substrings separated by param separator
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str.trim() // Trim whitespace from beginning and end of string str
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str1 < str2 // Return true if str1 is less than str2
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str1 > str2 // return true if str1 is greater than str2
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// Experimental I
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str.codePointAt(index) // Return non-negative int from string str that is the UTF-16 encoded code point at given index
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str1.includes(str2) // Return true if str2 is found in string str1
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str1.endsWith(str2) // Return true if string str1 ends with string str2
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str.normalize() // Return Unicode Normalization Form of string str
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str.repeat(int) // Return string repeated int times of string str
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str1.startsWith(str2) // Return true if string str1 starts with str2
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str[@@iterator]() // Return a new Iterator that iterates over the code points of string str, returning each code point as String value
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// General II
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str.charCodeAt(index) // Return number indicating Unicode value of char at given index of string str
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str1.concat(str2) // Combine text of strings str1 and str2 and return a new string
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str.lastIndexOf(substr) // Return last index within string str of substring substr
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str.slice(start, end) // Extract a section of string str from start to end
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str.substr(start, length) // Return characters in string str from start having length length
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// General III
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str.substring(index1, index2) // Return subset of string str between index1 and index2
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str.toLocaleLowerCase() //Convert chars in string str to lower case while respecting current locale
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str.toLocaleUpperCase() // Convert chars in string str to upper case while respecting current locale
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str.trimLeft() // Trim whitespace from left side of string st
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str.trimRight() // Trim whitespace form right side of string str
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// General IV
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str1.localeCompare(str2) // Return -1, 0, or 1 indicating if string str1 is less than, equal to, or greater than str2
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str.match(regexp) // Match a regular expression regexp against string str
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str1.replace(regexp, str2) // Replace matched regexp elements in string str1 with string str2
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str.search(regexp) // Return position of search for a match between regexp and string str

‎switch-case.js‎

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switch (
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new Date().getDay() // input is current day
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) {
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case 6: // if (day == 6)
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text = "Saturday";
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break;
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case 0: // if (day == 0)
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text = "Sunday";
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break;
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default:
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// else...
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text = "Weekday";
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}

‎variables.js‎

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var a; // variable
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var b = "init"; // string
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var c = "Hi" + " " + "Joe"; // = "Hi Joe"
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var d = 1 + 2 + "3"; // = "33"
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var e = [2, 3, 5, 8]; // array
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var f = false; // boolean
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var g = /()/; // RegEx
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var h = function() {}; // function object
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const PI = 3.14; // constant
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var a = 1,
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b = 2,
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c = a + b; // one line
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let z = "zzz"; // block scope local variable

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