Q271. How do you trim a string in javascript?
JavaScript provided a trim method on string types to trim any whitespaces present at the beginning or ending of the string. ```javascript " Hello World ".trim(); //Hello ...
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Q272. How to do logging in React Native?
You can use `console.log`, `console.warn`, etc. As of React Native v0.29 you can simply run the following to see logs in the console: ``` $ react-native log-ios $ react-n...
Q273. How do you add a key value pair in javascript?
There are two possible solutions to add new properties to an object. Let's take a simple object to explain these solutions. ```javascript var object = { key1: value1, key...
Q274. How to debug your React Native?
Follow the below steps to debug React Native app: 1. Run your application in the iOS simulator. 2. Press `Command + D` and a webpage should open up at `http://localhost:8...
Q275. Is the !-- notation represents a special operator?
No,that's not a special operator. But it is a combination of 2 standard operators one after the other, 1. A logical not (!) 2. A prefix decrement (--) At first, the value...
Q276. What is reselect and how it works?
_Reselect_ is a **selector library** (for Redux) which uses _memoization_ concept. It was originally written to compute derived data from Redux-like applications state, b...
Q277. How do you assign default values to variables?
You can use the logical or operator `||` in an assignment expression to provide a default value. The syntax looks like as below, ```javascript var a = b || c; ``` As per ...
Q278. What is Flow?
_Flow_ is a _static type checker_ designed to find type errors in JavaScript. Flow types can express much more fine-grained distinctions than traditional type systems. Fo...
Q279. How do you define multiline strings?
You can define multiline string literals using the '\n' character followed by line terminator('\'). ```javascript var str = "This is a \n very lengthy \n sentence!"; cons...
Q280. What is the difference between Flow and PropTypes?
Flow is a _static analysis tool_ (static checker) which uses a superset of the language, allowing you to add type annotations to all of your code and catch an entire clas...