cs101 short notes lecture 23 to 45 2021.
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Table of Contents
Lecture 23
JavaScript Variables are Dynamically Typed
Any variable that present in JavaScript can hold any type of value, and the that type of value can
change midway through the program.
See also:
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eng101 final term solved papers by moaaz 2021
Lecture 24
Design Heuristics
Heuristic
A very important technique is available such as trial & errort hat helps in learning of Rule of thumb.
Common sense lesson drawn from experience
Qualitative principle, guideline, general judgement
System
A System is a collection of different elements which working together produces a result that can not achieved by the things alone.
The structure when we discuss in the terms of components, connections, constraints of a product or a process.
Lecture 25
Web Design for Usability
Heuristic:
You must know that Heuristics does not always leads to the best results.
What‘s a Good Site?
- The website which fullfils the requirements or one that achieves the result that it was designed for.
SPEED:
- Users don’t read; they scan
- Users do not make optimal choices; they search or look for the first good-enough solution
- Users do not figure out that how things work; they muddle through.
Design is Important!:
- 62% (Sixty two percent) of shoppers gave up looking for the item they wanted to buy online (Zona
Research)
- 40% (forty percent) visitors don‘t return to a site if their first visit was a -ive experience
(Forrester Research)
- 83% (Eighty three percent) of users have left sites in frustration due to poor navigation, slowness
(NetSmart Research)
JavaScript Variables are Dynamically Typed
Any variable which available in JavaScript can hold any type of value, & the that type of value can be change midway through the program.
