TechCBT: JavaScript Arrays in Depth

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Covers Arrays in JavaScript, Various types of declaration and initializations, Associative Arrays, Nesting Arrays, Array Functions etc. Video tutorials available at http://youtube.com/techcbt-online

Software

TechCBT
Advanced
JavaScript
Module-01
JavaScript Arrays:
In Depth
http://www.TechCbt.com https://www.youtube.com/c/techCbt-online

TechCBT
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https://www.youtube.com/c/techCbt-online
Agenda
 Arrays
 Various types of declarations and
Initializations
 Associative Arrays
 Nesting Arrays
 Array functions

TechCBT
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https://www.youtube.com/c/techCbt-online
Arrays in JS: Simple introduction
 Array: Holds multiple values
 Array: Can hold multiple types of values
 “length”: gives no. of items in array
 Can access an item in an array by using
index
Various types
Index

TechCBT
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 DEMO (01)
› Declare an array
› Initialize with values
› Parse an array
»Display all values in array

TechCBT
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 DEMO (02)
› Adding array items dynamically

TechCBT
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JS Array: declaration & initialization
 Declare variable using “Array”
› Add items later
 Declare and initialize using “Array” function
(or constructor)
› Items added during declaration
 Using “set” brackets
› Items added during declaration
› Items could also be added later
Optional

TechCBT
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 DEMO (03)
› Various types of declarations and initializations of Arrays

TechCBT
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https://www.youtube.com/c/techCbt-online
Associative Arrays in JS
 Items in an array are usually accesses
using indexes.
 Can also have string indexes (keys)
› Nothing but Associative Array
 Parsing using keys
Numeric indexes
String indexes (keys)
Empno 1001

TechCBT
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 DEMO (04)
› Associative Array

TechCBT
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Nesting Arrays to form Collections
 Collection: An array which contains other
arrays as items
Collection
Arrays

TechCBT
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 DEMO (05)
› Collection

TechCBT
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Dangers of Array.length
 “length”: gives the no. of items in an array
› In reality, not quite that well in all scenarios!
 It does not work with “Associative Arrays” (arrays
with string indexes)
 Arrays with numeric indexes have some default
characteristics:
› If you add an element using numeric index, arrays
allocates for all previous indexes (if not allocated
already
› Results in a different “length” than you are supposed to
see
 Mixing Numeric and string indexes in the same
array?
› Not a good idea
0

TechCBT
http://www.techCbt.com
https://www.youtube.com/c/techCbt-online
 DEMO (06)
› Checking out Array.length with Associative Array
› How Array.length can really go wrong

TechCBT
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Array Functions: Push, Pop, Shift, Unshift
 Push:
› Adds an element at the end
 Pop:
› Removes an element from the end
 Shift:
› Removes an element from the top
 Unshift
› Adds (inserts) an element at the top
x
0
1
2
x1
2
3
4

TechCBT
http://www.techCbt.com
https://www.youtube.com/c/techCbt-online
 DEMO (07)
› Array functions
»Push
»Pop
»Shift
»Unshit

TechCBT
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https://www.youtube.com/c/techCbt-online
Array Functions: Join & Split
 Join:
› Concatenates all elements in the array
(separated by the delimiter we specify)
› Returns a string
 Split:
› Splits a string into an array (based on the
separator we specify)
› Returns an array

TechCBT
http://www.techCbt.com
https://www.youtube.com/c/techCbt-online
Array Functions: Slice, Splice, Sort & Reverse
 Slice:
› Extracts elements from an array
› Returns an array
› Does not modify existing array
 Splice:
› Removes elements from an array
› Replaces elements
» Can be used to add, insert dynamically
› Affects the existing array
 Sort
› Sorts an entire array
» Converts everything to string and uses lexicographical order by default
› Affects the existing array
 Reverse:
› Reverses the indexes (thus reverses the array)
› Affects the existing array

TechCBT
http://www.techCbt.com
https://www.youtube.com/c/techCbt-online
 DEMO (08)
› Array functions
»Slice
»Splice
»Reverse
»Sort

TechCBT
http://www.techCbt.com
https://www.youtube.com/c/techCbt-online
Array Functions: Concat, indexOf, lastIndexOf
 Concat:
› Joins two or more arrays
› Returns an array
› Does not modify existing array
 indexOf:
› Finds a an item
» From either from start (index 0) or from specified
› Returns Position
» -1 if not found
 lastIndexOf
› Finds a an item
» From either from start (index 0) or from specified
› Returns Position
» -1 if not found

TechCBT
http://www.techCbt.com
https://www.youtube.com/c/techCbt-online
 DEMO (09)
› Array functions
»concat
»indexOf
»lastIndexOf

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React.js, a JavaScript library developed by Facebook, has gained immense popularity for building user interfaces, especially for single-page applications. Over the years, React has evolved and expanded its capabilities, becoming a preferred choice for mobile app development. This article will explore why React.js is an excellent choice for the Best Mobile App development company in Noida. Visit Us For Information: https://www.linkedin.com/pulse/what-makes-reactjs-stand-out-mobile-app-development-rajesh-rai-pihvf/

一比一原版(USF毕业证)旧金山大学毕业证如何办理

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USF硕士毕业证成绩单【微信95270640】一比一伪造旧金山大学文凭@假冒USF毕业证成绩单+Q微信95270640办理USF学位证书@仿造USF毕业文凭证书@购买旧金山大学毕业证成绩单USF真实使馆认证/真实留信认证回国人员证明 #一整套旧金山大学文凭证件办理#—包含旧金山大学旧金山大学本科毕业证成绩单学历认证|使馆认证|归国人员证明|教育部认证|留信网认证永远存档教育部学历学位认证查询办理国外文凭国外学历学位认证#我们提供全套办理服务。一整套留学文凭证件服务：一：旧金山大学旧金山大学本科毕业证成绩单毕业证 #成绩单等全套材料从防伪到印刷水印底纹到钢印烫金二：真实使馆认证（留学人员回国证明）使馆存档三：真实教育部认证教育部存档教育部留服网站永久可查四：留信认证留学生信息网站永久可查国外毕业证学位证成绩单办理方法： 1客户提供办理旧金山大学旧金山大学本科毕业证成绩单信息：姓名生日专业学位毕业时间等（如信息不确定可以咨询顾问：我们有专业老师帮你查询）； 2开始安排制作毕业证成绩单电子图； 3毕业证成绩单电子版做好以后发送给您确认； 4毕业证成绩单电子版您确认信息无误之后安排制作成品； 5成品做好拍照或者视频给您确认； 6快递给客户（国内顺丰国外DHLUPS等快读邮寄）。教育部文凭学历认证认证的用途：如果您计划在国内发展那么办理国内教育部认证是必不可少的。事业性用人单位如银行国企公务员在您应聘时都会需要您提供这个认证。其他私营 #外企企业无需提供！办理教育部认证所需资料众多且烦琐所有材料您都必须提供原件我们凭借丰富的经验帮您快速整合材料让您少走弯路。实体公司专业为您服务如有需要请联系我: 微信95270640奈一次次令他失望山娃今年岁上五年级识得很多字从走出小屋开始山娃就知道父亲的家和工地共有一个很动听的名字——天河工地的底层空空荡荡很宽阔很凉爽在地上铺上报纸和水泥袋父亲和工人们中午全睡在地上地面坑坑洼洼山娃曾多次绊倒过也曾有长铁钉穿透凉鞋刺在脚板上但山娃不怕工地上也常有五六个从乡下来的小学生他们的父母亲也是高楼上的建筑工人小伙伴来自不同省份都操着带有浓重口音的普通话可不知为啥山娃不仅很快与他们熟识了

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如何办理(hull学位证书)英国赫尔大学毕业证硕士文凭原版一模一样

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原版定制【微信:bwp0011】《(hull学位证书)英国赫尔大学毕业证硕士文凭》【微信:bwp0011】成绩单、雅思、外壳、留信学历认证永久存档查询，采用学校原版纸张、特殊工艺完全按照原版一比一制作（包括：隐形水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠，文字图案浮雕，激光镭射，紫外荧光，温感，复印防伪）行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备，十五年致力于帮助留学生解决难题，业务范围有加拿大、英国、澳洲、韩国、美国、新加坡，新西兰等学历材料，包您满意。【业务选择办理准则】一、工作未确定，回国需先给父母、亲戚朋友看下文凭的情况，办理一份就读学校的毕业证【微信bwp0011】文凭即可二、回国进私企、外企、自己做生意的情况，这些单位是不查询毕业证真伪的，而且国内没有渠道去查询国外文凭的真假，也不需要提供真实教育部认证。鉴于此，办理一份毕业证【微信bwp0011】即可三、进国企，银行，事业单位，考公务员等等，这些单位是必需要提供真实教育部认证的，办理教育部认证所需资料众多且烦琐，所有材料您都必须提供原件，我们凭借丰富的经验，快捷的绿色通道帮您快速整合材料，让您少走弯路。留信网认证的作用: 1:该专业认证可证明留学生真实身份 2:同时对留学生所学专业登记给予评定 3:国家专业人才认证中心颁发入库证书 4:这个认证书并且可以归档倒地方 5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息 6:个人职称评审加20分 7:个人信誉贷款加10分 8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才【关于价格问题（保证一手价格）】我们所定的价格是非常合理的，而且我们现在做得单子大多数都是代理和回头客户介绍的所以一般现在有新的单子我给客户的都是第一手的代理价格，因为我想坦诚对待大家不想跟大家在价格方面浪费时间对于老客户或者被老客户介绍过来的朋友，我们都会适当给一些优惠。

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Consistent toolbox talks are critical for maintaining workplace safety, as they provide regular opportunities to address specific hazards and reinforce safe practices. These brief, focused sessions ensure that safety is a continual conversation rather than a one-time event, which helps keep safety protocols fresh in employees' minds. Studies have shown that shorter, more frequent training sessions are more effective for retention and behavior change compared to longer, infrequent sessions. Engaging workers regularly, toolbox talks promote a culture of safety, empower employees to voice concerns, and ultimately reduce the likelihood of accidents and injuries on site. The traditional method of conducting safety talks with paper documents and lengthy meetings is not only time-consuming but also less effective. Manual tracking of attendance and compliance is prone to errors and inconsistencies, leading to gaps in safety communication and potential non-compliance with OSHA regulations. Switching to a digital solution like Safelyio offers significant advantages. Safelyio automates the delivery and documentation of safety talks, ensuring consistency and accessibility. The microlearning approach breaks down complex safety protocols into manageable, bite-sized pieces, making it easier for employees to absorb and retain information. This method minimizes disruptions to work schedules, eliminates the hassle of paperwork, and ensures that all safety communications are tracked and recorded accurately. Ultimately, using a digital platform like Safelyio enhances engagement, compliance, and overall safety performance on site. https://safelyio.com/

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TechCBT: JavaScript Arrays in Depth

1. TechCBT Advanced JavaScript Module-01 JavaScript Arrays: In Depth http://www.TechCbt.com https://www.youtube.com/c/techCbt-online

2. TechCBT http://www.techCbt.com https://www.youtube.com/c/techCbt-online Agenda  Arrays  Various types of declarations and Initializations  Associative Arrays  Nesting Arrays  Array functions

3. TechCBT http://www.techCbt.com https://www.youtube.com/c/techCbt-online Arrays in JS: Simple introduction  Array: Holds multiple values  Array: Can hold multiple types of values  “length”: gives no. of items in array  Can access an item in an array by using index Various types Index

4. TechCBT http://www.techCbt.com https://www.youtube.com/c/techCbt-online  DEMO (01) › Declare an array › Initialize with values › Parse an array »Display all values in array

5. TechCBT http://www.techCbt.com https://www.youtube.com/c/techCbt-online  DEMO (02) › Adding array items dynamically

6. TechCBT http://www.techCbt.com https://www.youtube.com/c/techCbt-online JS Array: declaration & initialization  Declare variable using “Array” › Add items later  Declare and initialize using “Array” function (or constructor) › Items added during declaration  Using “set” brackets › Items added during declaration › Items could also be added later Optional

7. TechCBT http://www.techCbt.com https://www.youtube.com/c/techCbt-online  DEMO (03) › Various types of declarations and initializations of Arrays

8. TechCBT http://www.techCbt.com https://www.youtube.com/c/techCbt-online Associative Arrays in JS  Items in an array are usually accesses using indexes.  Can also have string indexes (keys) › Nothing but Associative Array  Parsing using keys Numeric indexes String indexes (keys) Empno 1001

9. TechCBT http://www.techCbt.com https://www.youtube.com/c/techCbt-online  DEMO (04) › Associative Array

10. TechCBT http://www.techCbt.com https://www.youtube.com/c/techCbt-online Nesting Arrays to form Collections  Collection: An array which contains other arrays as items Collection Arrays

11. TechCBT http://www.techCbt.com https://www.youtube.com/c/techCbt-online  DEMO (05) › Collection

12. TechCBT http://www.techCbt.com https://www.youtube.com/c/techCbt-online Dangers of Array.length  “length”: gives the no. of items in an array › In reality, not quite that well in all scenarios!  It does not work with “Associative Arrays” (arrays with string indexes)  Arrays with numeric indexes have some default characteristics: › If you add an element using numeric index, arrays allocates for all previous indexes (if not allocated already › Results in a different “length” than you are supposed to see  Mixing Numeric and string indexes in the same array? › Not a good idea 0

13. TechCBT http://www.techCbt.com https://www.youtube.com/c/techCbt-online  DEMO (06) › Checking out Array.length with Associative Array › How Array.length can really go wrong

14. TechCBT http://www.techCbt.com https://www.youtube.com/c/techCbt-online Array Functions: Push, Pop, Shift, Unshift  Push: › Adds an element at the end  Pop: › Removes an element from the end  Shift: › Removes an element from the top  Unshift › Adds (inserts) an element at the top x 0 1 2 x1 2 3 4

15. TechCBT http://www.techCbt.com https://www.youtube.com/c/techCbt-online  DEMO (07) › Array functions »Push »Pop »Shift »Unshit

16. TechCBT http://www.techCbt.com https://www.youtube.com/c/techCbt-online Array Functions: Join & Split  Join: › Concatenates all elements in the array (separated by the delimiter we specify) › Returns a string  Split: › Splits a string into an array (based on the separator we specify) › Returns an array

17. TechCBT http://www.techCbt.com https://www.youtube.com/c/techCbt-online Array Functions: Slice, Splice, Sort & Reverse  Slice: › Extracts elements from an array › Returns an array › Does not modify existing array  Splice: › Removes elements from an array › Replaces elements » Can be used to add, insert dynamically › Affects the existing array  Sort › Sorts an entire array » Converts everything to string and uses lexicographical order by default › Affects the existing array  Reverse: › Reverses the indexes (thus reverses the array) › Affects the existing array

18. TechCBT http://www.techCbt.com https://www.youtube.com/c/techCbt-online  DEMO (08) › Array functions »Slice »Splice »Reverse »Sort

19. TechCBT http://www.techCbt.com https://www.youtube.com/c/techCbt-online Array Functions: Concat, indexOf, lastIndexOf  Concat: › Joins two or more arrays › Returns an array › Does not modify existing array  indexOf: › Finds a an item » From either from start (index 0) or from specified › Returns Position » -1 if not found  lastIndexOf › Finds a an item » From either from start (index 0) or from specified › Returns Position » -1 if not found

20. TechCBT http://www.techCbt.com https://www.youtube.com/c/techCbt-online  DEMO (09) › Array functions »concat »indexOf »lastIndexOf

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