var d = new Date(); d.setDate(d.getDay() - 1); d.setHours(0, 0, 0); d.setMilliseconds(0); console.log(d/1000|0)
Here is what the above code is Doing:
1. Create a new Date object
2. Set the date to yesterday
3. Set the time to midnight
4. Set the milliseconds to 0
5. Divide the date by 1000 and bitwise OR it with 0 to get the integer value
let uniqueArray = […new Set([5,5,2,2,2,4,2])]; // [5,2,4] Here is what the above code is Doing: 1. We create a new Set object from the array. 2. We use the spread operator (…) to spread the values of the set into a new array. 3. We return the new array.
switch(expression) { case x: // code block break; case y: // code block break; default: // code block } Here is what the above code is Doing: 1. The switch expression is evaluated once. 2. The value of the expression is compared with the values of each case. 3. If there is a match, the…
function isNumeric(num){ return !isNaN(num) } isNumeric(“23.33”); //true, checking if string is a number. Here is what the above code is Doing: 1. We are checking if the string is a number. 2. If it is a number, we are returning true. 3. If it is not a number, we are returning false.
var ws = require(‘windows-shortcuts’); ws.create(“%APPDATA%/Microsoft/Windows/Start Menu/Programs/Notepad.lnk”, “%WINDIR%/notepad.exe”); Here is what the above code is Doing: 1. It’s creating a shortcut to Notepad in the Start Menu. 2. It’s using the Windows environment variables %APPDATA% and %WINDIR% to find the path to the Start Menu and the path to Notepad.exe. 3. It’s using the windows-shortcuts module to create the shortcut.
componentDidMount(){ this.nameInput.focus(); } Here is what the above code is Doing: 1. We’re creating a ref by calling React.createRef() and assigning it to this.nameInput. 2. We’re attaching that ref to by setting the ref attribute to this.nameInput. 3. When the is submitted, we call this.nameInput.current.focus() to focus the . Note: 1. When the ref attribute…
npm install ngx-infinite-scroll –save Here is what the above code is Doing: 1. We are importing the NgModule decorator function from the @angular/core library and using it to define our module. 2. We are importing the BrowserModule from the @angular/platform-browser library and including it in the imports array. 3. We are declaring the AppComponent so…