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Commit 81d6633

Browse files
Adding more
1 parent 8b13076 commit 81d6633

19 files changed

+274
-0
lines changed

‎array-methods.js

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@@ -26,6 +26,8 @@ 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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concat, copyWithin, every, fill, filter, find, findIndex, forEach, indexOf, isArray, join, lastIndexOf, map, pop, push, reduce, reduceRight, reverse, shift, slice, some, sort, splice, toString, unshift, valueOf
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/* More Array Methods */
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// Accessing Elements I

‎break-continue.js

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for (var i = 0; i < 10; i++) {
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if (i == 5) {
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break; // stops and exits the cycle
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}
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document.write(i + ", "); // last output number is 4
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}
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for (var i = 0; i < 10; i++) {
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if (i == 5) {
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continue; // skips the rest of the cycle
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}
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document.write(i + ", "); // skips 5
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}

‎comments.js

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/* Multi line
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comment */
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// One line

‎do-while-loop.js

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var i = 1; // initialize
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do {
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// enters cycle at least once
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i *= 2; // increment to avoid infinite loop
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document.write(i + ", "); // output
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} while (i < 100); // repeats cycle if statement is true at the end

‎error-try-catch-throw.js

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try {
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// block of code to try
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undefinedFunction();
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} catch (err) {
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// block to handle errors
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console.log(err.message);
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}
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// Throw error
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throw "My error message"; // throw a text
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// Input validation
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var x = document.getElementById("mynum").value; // get input value
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try {
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if (x == "") throw "empty"; // error cases
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if (isNaN(x)) throw "not a number";
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x = Number(x);
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if (x > 10) throw "too high";
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} catch (err) {
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// if there's an error
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document.write("Input is " + err); // output error
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console.error(err); // write the error in console
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} finally {
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document.write("</br />Done"); // executed regardless of the try / catch result
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}

‎error-types.js

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// Error name values
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RangeError A number is "out of range"
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ReferenceError An illegal reference has occurred
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SyntaxError A syntax error has occurred
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TypeError A type error has occurred
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URIError An encodeURI() error has occurred

‎for-loops.js

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for (var i = 0; i < 10; i++) {
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document.write(i + ": " + i*3 + "<br />");
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}
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var sum = 0;
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for (var i = 0; i < a.length; i++) {
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sum + = a[i];
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} // parsing an array
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html = "";
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for (var i of custOrder) {
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html += "<li>" + i + "</li>";
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}

‎functions.js

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function addNumbers(a, b) {
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return a + b;
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}
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x = addNumbers(1, 2);

‎js-date-object.js

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// Sat Feb 22 2020 19:31:24 GMT+0530 (India Standard Time)
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var d = new Date();
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// 1582380084791 miliseconds passed since 1970
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Number(d);
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Date("2017年06月23日"); // date declaration
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Date("2017"); // is set to Jan 01
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Date("2017年06月23日T12:00:00-09:45"); // date - time YYYY-MM-DDTHH:MM:SSZ
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Date("June 23 2017"); // long date format
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Date("Jun 23 2017 07:45:00 GMT+0100 (Tokyo Time)"); // time zone
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// Get Times
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var d = new Date();
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a = d.getDay(); // getting the weekday
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getDate(); // day as a number (1-31)
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getDay(); // weekday as a number (0-6)
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getFullYear(); // four digit year (yyyy)
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getHours(); // hour (0-23)
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getMilliseconds(); // milliseconds (0-999)
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getMinutes(); // minutes (0-59)
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getMonth(); // month (0-11)
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getSeconds(); // seconds (0-59)
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getTime(); // milliseconds since 1970
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// Setting part of a date
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var d = new Date();
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d.setDate(d.getDate() + 7); // adds a week to a date
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setDate(); // day as a number (1-31)
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setFullYear(); // year (optionally month and day)
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setHours(); // hour (0-23)
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setMilliseconds(); // milliseconds (0-999)
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setMinutes(); // minutes (0-59)
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setMonth(); // month (0-11)
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setSeconds(); // seconds (0-59)
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setTime(); // milliseconds since 1970)

‎js-global-functions.js

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eval(); // executes a string as if it was script code
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String(23); // return string from number
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(23).toString(); // return string from number
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Number("23"); // return number from string
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decodeURI(enc); // decode URI. Result: "my page.asp"
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encodeURI(uri); // encode URI. Result: "my%page.asp"
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decodeURIComponent(enc); // decode a URI component
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encodeURIComponent(uri); // encode a URI component
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isFinite(); // is variable a finite, legal number
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isNaN(); // is variable an illegal number
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parseFloat(); // returns floating point number of string
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parseInt(); // parses a string and returns an integer

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