Truthy values: Any numbers value truthy others than 0 and any string values truthy other than an empty string.
Falsy values: Any variable values likes(false,empty string, 0, undefined, nul, NaN)called falsy valuse.
Undefined: Unintentionally missing values. undefined is negative/falsy values. undefined is variable declared but not the value set and function explicitly not a return value or function call but not parameters pass, and any object property access but this property not in an object this called undefined. undefined means a variable has been declared but not defined yet.
Null: Intentionally missing values called a null. and null is an…
It generally the entry point for react application into the browser’s DOM(Document Object Model). It has two arguments. The first one stands for what to render to the browser. It always reacts to elements. the second one stands for where to render the react elements on the browser.
02. Error Boundaries:
01. Coding Style
Coding Style not mandatory to apply for your code. But coding style is a good practice and your code clean and readable to apply code style.
Code style applies some rules:
We know comments code structure single line or multi-line. we normally use the describe how and why code works.
when using comments:
when not use comments :
concat () Method input string arguments and adding arguments return new concat() string arguments. Change original string.
conat str1 = ‘Concat(): Method:
Concat () Method input string arguments and adding arguments return new concat() string arguments. Change orginial string but bo effect.
conat str1 = ‘ Raju’;
concat str2 = ‘ Biswas’;
console.log(str1.concat(‘ ’, str2));
OutPut = ‘’Raju, Biswas’’’;
02. includes() Method.
Includes() is case sensitive, search one string if found within another string, includes return true or false.
const line = ‘ He goes to school late today.’;
const word = ‘late’;