JSON is a simple data exchange format. JSON means JavaScript Object Notation; it is language and platform-independent.
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JSON Interview Cheatsheet
We have been using and hearing a lot about JSON, but many of us don't really know what is JSON, below is a Thread about Json and Interview Questions!
🧵Thread🧵
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JSON is a simple data exchange format. JSON means JavaScript Object Notation; it is language and platform-independent.
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An object can be defined as an unordered set of name/value pairs. An object in JSON starts with {left brace} and finish or ends with {right brace}. Every name is followed by: (colon) and the name/value pairs are parted by,.
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One of the common use of JSON is to collect JSON data from a web server as a file or HTTP request and convert the JSON data to JavaScript, and then it avails the data in a web page.
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JSON syntax is a set of the JavaScript object notation syntax.
Data is in name/value pairs
Data is separated by comma
Curly brackets hold objects
Square bracket holds arrays
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It is faster and lighter than XML as on the wire data format
XML data is typeless while JSON objects are typed
JSON types: Number, Array, Boolean, String
XML data are all string
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JSON RPC: It is a simple remote procedure call protocol same as XML-RPC it uses the lightweight JSON format
JSON Parser: JSON parser is used to parse the JSON data into objects to use its value.
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To convert JSON text into an object “eval” function is used.
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Data types supported by JSON includes
Number
String
Boolean
Array
Object
Null
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JSON.stringify() converts an object into a JSON text and saves that JSON text in a string.
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To parse JSON in JQuery, we will see the example
var JSON = ‘{“name”: “Guru 99”, “Description “: “Learn PHP Interactively with PHP Beginner Tutorials}
obj = $.parseJSON(json);
//alert(https://t.co/Y7zz0x7YXk);
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For encoding JSON in PHP, json_encode () function is used. This function returns the JSON representation of a value on success or false on failure.
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To convert a string into a JSON array, you need to create a JSONObject object for each of your objects, and add those to your JSON array.
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JSON file type for JSON files is “.json”
The MIME type for JSON text is “application/JSON”
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Uses of JSON includes
When writing an application based on JavaScript it uses JSON, which includes browser extension and websites
JSON is used for transmitting and serializing structured data over a network connection
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Drawbacks of JSON are
It does not contain a type definition
It lacks some sort of DTD
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JSONP stands for JSON with padding. It is a method used to bypass the cross-domain policies in web browsers. In other words, JSONP is the simple way to deal with browser restrictions when sending JSON responses from different domains from the client.
MIME type for JSON text is “application/json”
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JSON is a simple data format used for communication medium between different systems
JSONP is a methodology for using that format with cross-domain ajax requests while not being affected by the same-origin policy issue
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1/ Some initial thoughts on personal moats:
Like company moats, your personal moat should be a competitive advantage that is not only durable—it should also compound over time.
Characteristics of a personal moat below:
2/ Like a company moat, you want to build career capital while you sleep.
As Andrew Chen noted:
3/ You don’t want to build a competitive advantage that is fleeting or that will get commoditized
Things that might get commoditized over time (some longer than
4/ Before the arrival of recorded music, what used to be scarce was the actual music itself — required an in-person artist.
After recorded music, the music itself became abundant and what became scarce was curation, distribution, and self space.
5/ Similarly, in careers, what used to be (more) scarce were things like ideas, money, and exclusive relationships.
In the internet economy, what has become scarce are things like specific knowledge, rare & valuable skills, and great reputations.
Like company moats, your personal moat should be a competitive advantage that is not only durable—it should also compound over time.
Characteristics of a personal moat below:
I'm increasingly interested in the idea of "personal moats" in the context of careers.
— Erik Torenberg (@eriktorenberg) November 22, 2018
Moats should be:
- Hard to learn and hard to do (but perhaps easier for you)
- Skills that are rare and valuable
- Legible
- Compounding over time
- Unique to your own talents & interests https://t.co/bB3k1YcH5b
2/ Like a company moat, you want to build career capital while you sleep.
As Andrew Chen noted:
People talk about \u201cpassive income\u201d a lot but not about \u201cpassive social capital\u201d or \u201cpassive networking\u201d or \u201cpassive knowledge gaining\u201d but that\u2019s what you can architect if you have a thing and it grows over time without intensive constant effort to sustain it
— Andrew Chen (@andrewchen) November 22, 2018
3/ You don’t want to build a competitive advantage that is fleeting or that will get commoditized
Things that might get commoditized over time (some longer than
Things that look like moats but likely aren\u2019t or may fade:
— Erik Torenberg (@eriktorenberg) November 22, 2018
- Proprietary networks
- Being something other than one of the best at any tournament style-game
- Many "awards"
- Twitter followers or general reach without "respect"
- Anything that depends on information asymmetry https://t.co/abjxesVIh9
4/ Before the arrival of recorded music, what used to be scarce was the actual music itself — required an in-person artist.
After recorded music, the music itself became abundant and what became scarce was curation, distribution, and self space.
5/ Similarly, in careers, what used to be (more) scarce were things like ideas, money, and exclusive relationships.
In the internet economy, what has become scarce are things like specific knowledge, rare & valuable skills, and great reputations.
So the cryptocurrency industry has basically two products, one which is relatively benign and doesn't have product market fit, and one which is malignant and does. The industry has a weird superposition of understanding this fact and (strategically?) not understanding it.
The benign product is sovereign programmable money, which is historically a niche interest of folks with a relatively clustered set of beliefs about the state, the literary merit of Snow Crash, and the utility of gold to the modern economy.
This product has narrow appeal and, accordingly, is worth about as much as everything else on a 486 sitting in someone's basement is worth.
The other product is investment scams, which have approximately the best product market fit of anything produced by humans. In no age, in no country, in no city, at no level of sophistication do people consistently say "Actually I would prefer not to get money for nothing."
This product needs the exchanges like they need oxygen, because the value of it is directly tied to having payment rails to move real currency into the ecosystem and some jurisdictional and regulatory legerdemain to stay one step ahead of the banhammer.
If everyone was holding bitcoin on the old x86 in their parents basement, we would be finding a price bottom. The problem is the risk is all pooled at a few brokerages and a network of rotten exchanges with counter party risk that makes AIG circa 2008 look like a good credit.
— Greg Wester (@gwestr) November 25, 2018
The benign product is sovereign programmable money, which is historically a niche interest of folks with a relatively clustered set of beliefs about the state, the literary merit of Snow Crash, and the utility of gold to the modern economy.
This product has narrow appeal and, accordingly, is worth about as much as everything else on a 486 sitting in someone's basement is worth.
The other product is investment scams, which have approximately the best product market fit of anything produced by humans. In no age, in no country, in no city, at no level of sophistication do people consistently say "Actually I would prefer not to get money for nothing."
This product needs the exchanges like they need oxygen, because the value of it is directly tied to having payment rails to move real currency into the ecosystem and some jurisdictional and regulatory legerdemain to stay one step ahead of the banhammer.
