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\n\nThe first line (in the script) creates an array named cars.\n\nThe second line \"finds\" the element with id=\"demo\",\n and \"displays\" the array in the \"innerHTML\" of it. \nWhat is an Array?\n\nAn array is a special variable, \nwhich can hold more than one value at a time.","datePublished":"2019-02-11T15:17:01Z","dateModified":"2019-02-11T15:17:01Z","author":{"@type":"Organization","name":"Software programing","url":"https://telemetr.io/ch/channels/1259641032-software_programming1","image":"https://img.tlmtr.io/c/1nfkaQ/5846196616325870645?ty=x"},"publisher":{"@type":"Organization","name":"Software programing","url":"https://telemetr.io/ch/channels/1259641032-software_programming1","image":"https://img.tlmtr.io/c/1nfkaQ/5846196616325870645?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":694}]}},{"@type":"ListItem","position":14,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/ch/channels/1259641032-software_programming1/posts/414","url":"https://telemetr.io/ch/channels/1259641032-software_programming1/posts/414","mainEntityOfPage":"https://telemetr.io/ch/channels/1259641032-software_programming1/posts/414","headline":"https://t.me/hokingrasta","articleBody":"https://t.me/hokingrasta","datePublished":"2019-02-10T15:23:41Z","dateModified":"2019-02-10T15:23:41Z","author":{"@type":"Organization","name":"Software programing","url":"https://telemetr.io/ch/channels/1259641032-software_programming1","image":"https://img.tlmtr.io/c/1nfkaQ/5846196616325870645?ty=x"},"publisher":{"@type":"Organization","name":"Software programing","url":"https://telemetr.io/ch/channels/1259641032-software_programming1","image":"https://img.tlmtr.io/c/1nfkaQ/5846196616325870645?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":675}]}},{"@type":"ListItem","position":15,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/ch/channels/1259641032-software_programming1/posts/409","url":"https://telemetr.io/ch/channels/1259641032-software_programming1/posts/409","mainEntityOfPage":"https://telemetr.io/ch/channels/1259641032-software_programming1/posts/409","headline":"JavaScript provides 8 mathematical constants that can be accessed with the Math object: Example Math.E // ret…","articleBody":"JavaScript provides 8 mathematical constants\nthat can be accessed with the Math object:\nExample\nMath.E // returns Euler's number\nMath.PI // returns PI\nMath.SQRT2 // returns the square root of 2\nMath.SQRT1_2 // returns the square root of 1/2\nMath.LN2 // returns the natural logarithm of 2\nMath.LN10 // returns the natural logarithm of 10\nMath.LOG2E // returns base 2 logarithm of E\nMath.LOG10E // returns base 10 logarithm of E\n\n@software_programming1","datePublished":"2019-02-08T14:09:02Z","dateModified":"2019-02-08T14:09:02Z","author":{"@type":"Organization","name":"Software programing","url":"https://telemetr.io/ch/channels/1259641032-software_programming1","image":"https://img.tlmtr.io/c/1nfkaQ/5846196616325870645?ty=x"},"publisher":{"@type":"Organization","name":"Software programing","url":"https://telemetr.io/ch/channels/1259641032-software_programming1","image":"https://img.tlmtr.io/c/1nfkaQ/5846196616325870645?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":716},{"@type":"InteractionCounter","interactionType":"https://schema.org/ShareAction","userInteractionCount":1}]}},{"@type":"ListItem","position":16,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/ch/channels/1259641032-software_programming1/posts/408","url":"https://telemetr.io/ch/channels/1259641032-software_programming1/posts/408","mainEntityOfPage":"https://telemetr.io/ch/channels/1259641032-software_programming1/posts/408","headline":"Math.min() and Math.max() Math.min() and Math.max() can be used to find the lowest or highest value in a list…","articleBody":"Math.min() and Math.max()\n\nMath.min() and Math.max() can be used to find the\n lowest or highest value in a list of arguments:\nExample\nMath.min(0, 15,-8, -200); // returns -200 \nMath.max(0, 15,-8, -200); // returns 15\n\nMath.round() rounds a number to the nearest integer:\n\nExample\nMath.round(4.7); // returns 5\nMath.round(4.4); // returns 4 \n\nMath.ceil() rounds a number up to the nearest integer:\n\nExample\nMath.ceil(4.4); // returns 5 \n\nMath.floor() rounds a number down to the nearest integer:\n\nExample\nMath.floor(4.7); // returns 4 \n@software_programming1","datePublished":"2019-02-08T14:08:22Z","dateModified":"2019-02-08T14:08:22Z","author":{"@type":"Organization","name":"Software programing","url":"https://telemetr.io/ch/channels/1259641032-software_programming1","image":"https://img.tlmtr.io/c/1nfkaQ/5846196616325870645?ty=x"},"publisher":{"@type":"Organization","name":"Software programing","url":"https://telemetr.io/ch/channels/1259641032-software_programming1","image":"https://img.tlmtr.io/c/1nfkaQ/5846196616325870645?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":698}]}},{"@type":"ListItem","position":17,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/ch/channels/1259641032-software_programming1/posts/407","url":"https://telemetr.io/ch/channels/1259641032-software_programming1/posts/407","mainEntityOfPage":"https://telemetr.io/ch/channels/1259641032-software_programming1/posts/407","headline":"you can use the toString() method to output numbers as base 16 (hex), base 8 (octal), or base 2 (binary). Exa…","articleBody":"you can use the toString() method to output numbers as base 16 (hex), base 8 (octal), or base 2 (binary).\nExample👽\nvar myNumber = 128;\nmyNumber.toString(16); // returns 80 hexadecimal\nmyNumber.toString(8); // returns 200 octal\nmyNumber.toString(2); // returns 10000000 binary\nInfinity\n\nInfinity (or -Infinity) is the value JavaScript will return if you calculate a number outside the largest possible number.\nExample👽\nvar myNumber = 2;\nwhile (myNumber != Infinity) { // Execute until Infinity\n myNumber = myNumber * myNumber;\n}\n@software_programming1","datePublished":"2019-02-05T12:44:36Z","dateModified":"2019-02-05T12:44:36Z","author":{"@type":"Organization","name":"Software programing","url":"https://telemetr.io/ch/channels/1259641032-software_programming1","image":"https://img.tlmtr.io/c/1nfkaQ/5846196616325870645?ty=x"},"publisher":{"@type":"Organization","name":"Software programing","url":"https://telemetr.io/ch/channels/1259641032-software_programming1","image":"https://img.tlmtr.io/c/1nfkaQ/5846196616325870645?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":686},{"@type":"InteractionCounter","interactionType":"https://schema.org/ShareAction","userInteractionCount":1}]}},{"@type":"ListItem","position":18,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/ch/channels/1259641032-software_programming1/posts/406","url":"https://telemetr.io/ch/channels/1259641032-software_programming1/posts/406","mainEntityOfPage":"https://telemetr.io/ch/channels/1259641032-software_programming1/posts/406","headline":"👽To solve the problem above, it helps to multiply and divide: Example👻 var x = (0.2 * 10 + 0.1 * 10) / 10; //…","articleBody":"👽To solve the problem above, it helps to multiply and divide:\nExample👻\nvar x = (0.2 * 10 + 0.1 * 10) / 10; // x will be 0.3\n😎😎😎😎\nHexadecimal\n\nJavaScript interprets numeric constants as hexadecimal if they are\n preceded by 0x.\nExample\nvar x = 0xFF; // x will be 255\n@software_programming1","datePublished":"2019-02-05T12:44:36Z","dateModified":"2019-02-05T12:44:36Z","author":{"@type":"Organization","name":"Software programing","url":"https://telemetr.io/ch/channels/1259641032-software_programming1","image":"https://img.tlmtr.io/c/1nfkaQ/5846196616325870645?ty=x"},"publisher":{"@type":"Organization","name":"Software programing","url":"https://telemetr.io/ch/channels/1259641032-software_programming1","image":"https://img.tlmtr.io/c/1nfkaQ/5846196616325870645?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":652}]}},{"@type":"ListItem","position":19,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/ch/channels/1259641032-software_programming1/posts/405","url":"https://telemetr.io/ch/channels/1259641032-software_programming1/posts/405","mainEntityOfPage":"https://telemetr.io/ch/channels/1259641032-software_programming1/posts/405","headline":"JavaScript Numbers JavaScript has only one type of number. Numbers can be written with, or without, decimals.…","articleBody":"JavaScript Numbers\nJavaScript has only one type of number.\n\nNumbers can be written with, or without, decimals.\n\nExample\nvar x = 34.00; // A number with decimals\nvar y = 34; // A number without decimals\nJavaScript Numbers are Always 64-bit Floating Point\n\nUnlike many other programming languages, JavaScript does not define \ndifferent types of numbers, like integers, short, long, floating-point \netc.\n\n@software_programming1","datePublished":"2019-02-05T12:44:36Z","dateModified":"2019-02-05T12:44:36Z","author":{"@type":"Organization","name":"Software programing","url":"https://telemetr.io/ch/channels/1259641032-software_programming1","image":"https://img.tlmtr.io/c/1nfkaQ/5846196616325870645?ty=x"},"publisher":{"@type":"Organization","name":"Software programing","url":"https://telemetr.io/ch/channels/1259641032-software_programming1","image":"https://img.tlmtr.io/c/1nfkaQ/5846196616325870645?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":638}]}},{"@type":"ListItem","position":20,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/ch/channels/1259641032-software_programming1/posts/404","url":"https://telemetr.io/ch/channels/1259641032-software_programming1/posts/404","mainEntityOfPage":"https://telemetr.io/ch/channels/1259641032-software_programming1/posts/404","headline":"👽Extracting String Characters There are 2 safe methods for extracting string characters: charAt(position) cha…","articleBody":"👽Extracting String Characters\n\nThere are 2 safe methods for extracting string characters:\n\n charAt(position)\n charCodeAt(position)\n\nThe charAt() Method👈\n\nThe charAt() method returns the character at a specified\n index (position) in a string:\nExample\nvar str = \"HELLO WORLD\";\nstr.charAt(0); // returns H\n\n method 2 The charCodeAt() Method👈\n\nThe charCodeAt() method returns the unicode of the character at \na specified index in a string:\nExample👻\nvar str = \"HELLO WORLD\";\n\nstr.charCodeAt(0); // returns 72\n@software_programming1","datePublished":"2019-02-04T08:16:22Z","dateModified":"2019-02-04T08:16:22Z","author":{"@type":"Organization","name":"Software programing","url":"https://telemetr.io/ch/channels/1259641032-software_programming1","image":"https://img.tlmtr.io/c/1nfkaQ/5846196616325870645?ty=x"},"publisher":{"@type":"Organization","name":"Software programing","url":"https://telemetr.io/ch/channels/1259641032-software_programming1","image":"https://img.tlmtr.io/c/1nfkaQ/5846196616325870645?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":631}]}}]}
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#Interesting facts about Programming
1😍 The first computer programmer was a female, named Ada Lovelace.😍
2⚽The first game was created in 1961. Fun facts are that it didn’t earn any money. ⚽
3👽 The first virus was created in 1983.👽
4👿 The first computer“bug(error)” was identified in 1947 as a dead moth.😈
5😊 FIRST HIGH-LEVEL COMPUTER PROGRAMMING LANGUAGE USED: FORTRAN 😊
6😎 The original name for JAVA was OAK.😎
7😳 JavaScript is not compiled.😳
@software_programming1
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JavaScript Objective Questions
1 JavaScript is …
A. subjective
B. objective
C. evil
D. object based
2 What does the following expression return? 1 + 5 + ” bottles of milk”;
A. “15 bottles of milk”
B. “6 bottles of milk”
C. undefined. An exception is thrown
D. “5 bottles of milk”
3 How do you create an object in JavaScript?
A. var obj = {};
B. function Foo() {} var obj = new Foo();
C. All of these work.
D. var obj = new Object();
4 What is the result of the following statement: typeof “x”;
A. “character”
B. “[object String]”
C. Throws error “ReferenceError: x is not defined”
D. “string”
E. “undefined”
5 Primitive types are passed by :
A. Value
B. Pointer
C. Reference
1 471
Looping Array Elements
The best way to loop through an array, is using a "for" loop:
Example
var fruits, text, fLen, i;
fruits = ["Banana", "Orange", "Apple", "Mango"];
fLen = fruits.length;
text = "
- ";
for (i = 0; i < fLen; i++) {
text += "
- " + fruits[i] + " "; } These two different statements both create a new empty array named points: var points = new Array(); // Bad var points = []; // Good These two different statements both create a new array containing 6 numbers: var points = new Array(40, 25, 10) // Bad var points = [40,25, 10]; // Good
1 471
Creating an Array
Using an array literal is the easiest way to create a JavaScript Array.
Syntax:
var array-name = [item1, item2, ...];
Example:
var cars = ["corola", "vitz", "BMW"];
This statement modifies the first element in cars:
cars[0] = "hammer";
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#JavaScript Arrays
are used to store multiple values in a single variable.
In this tutorial we will use a script to
display arrays inside a <p> element with id="demo":
Example
<p id="demo"></p>
<script>
var cars = ["Saab", "Volvo", "BMW"];
document.getElementById("demo").innerHTML = cars;
</script>
The first line (in the script) creates an array named cars.
The second line "finds" the element with id="demo",
and "displays" the array in the "innerHTML" of it.
What is an Array?
An array is a special variable,
which can hold more than one value at a time.
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JavaScript provides 8 mathematical constants
that can be accessed with the Math object:
Example
Math.E // returns Euler's number
Math.PI // returns PI
Math.SQRT2 // returns the square root of 2
Math.SQRT1_2 // returns the square root of 1/2
Math.LN2 // returns the natural logarithm of 2
Math.LN10 // returns the natural logarithm of 10
Math.LOG2E // returns base 2 logarithm of E
Math.LOG10E // returns base 10 logarithm of E
@software_programming1
1 471
Math.min() and Math.max()
Math.min() and Math.max() can be used to find the
lowest or highest value in a list of arguments:
Example
Math.min(0, 15,-8, -200); // returns -200
Math.max(0, 15,-8, -200); // returns 15
Math.round() rounds a number to the nearest integer:
Example
Math.round(4.7); // returns 5
Math.round(4.4); // returns 4
Math.ceil() rounds a number up to the nearest integer:
Example
Math.ceil(4.4); // returns 5
Math.floor() rounds a number down to the nearest integer:
Example
Math.floor(4.7); // returns 4
@software_programming1
1 471
you can use the toString() method to output numbers as base 16 (hex), base 8 (octal), or base 2 (binary).
Example👽
var myNumber = 128;
myNumber.toString(16); // returns 80 hexadecimal
myNumber.toString(8); // returns 200 octal
myNumber.toString(2); // returns 10000000 binary
Infinity
Infinity (or -Infinity) is the value JavaScript will return if you calculate a number outside the largest possible number.
Example👽
var myNumber = 2;
while (myNumber != Infinity) { // Execute until Infinity
myNumber = myNumber * myNumber;
}
@software_programming1
1 471
👽To solve the problem above, it helps to multiply and divide:
Example👻
var x = (0.2 * 10 + 0.1 * 10) / 10; // x will be 0.3
😎😎😎😎
Hexadecimal
JavaScript interprets numeric constants as hexadecimal if they are
preceded by 0x.
Example
var x = 0xFF; // x will be 255
@software_programming1
1 471
JavaScript Numbers
JavaScript has only one type of number.
Numbers can be written with, or without, decimals.
Example
var x = 34.00; // A number with decimals
var y = 34; // A number without decimals
JavaScript Numbers are Always 64-bit Floating Point
Unlike many other programming languages, JavaScript does not define
different types of numbers, like integers, short, long, floating-point
etc.
@software_programming1
1 471
👽Extracting String Characters
There are 2 safe methods for extracting string characters:
charAt(position)
charCodeAt(position)
The charAt() Method👈
The charAt() method returns the character at a specified
index (position) in a string:
Example
var str = "HELLO WORLD";
str.charAt(0); // returns H
method 2 The charCodeAt() Method👈
The charCodeAt() method returns the unicode of the character at
a specified index in a string:
Example👻
var str = "HELLO WORLD";
str.charCodeAt(0); // returns 72
@software_programming1
