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Tried this command: echo "/export *(rw,async,no_root_squash,no_subtree_check)" > /etc/exports But the file didn’t get updated. Core Issue: Redirection (>) Happens Before sudo When executing sudo echo "line" > /etc/file Only the echo runs with sudo. So this fails silently (or leaves the file empty). Correct Approach: Use sudo tee echo "/export *(rw,async,no_root_squash,no_subtree_check)" | sudo tee /etc/exports > /dev/null This works because: echo runs normally Output is piped (|) to sudo tee tee runs with root privileges and writes the file IMPORTANT: Append Instead of Overwrite?...

Handling Props in Child and Parent Component Whenever we define a parent and a child component in React using Typescript, we must always define an Interface in the child component which defines what props child expects to recieve. By adding an interface to the child component, we are adding two big checks: In Parent Component: Are we providing the correct props to Child when we add it ti Parent? In Child Component: Are we using the correctly named + typed props in Child?...

The Javascript Array.every() method tests whether all the elements of an array satisfy the given condition (a callback passed in by the user). In essence, the every() method executes the callback function for each element of the array and returns true if all elements return true or false if only one element returns false. const isBelowThreshold = (currentValue) => currentValue < 40; const array1 = [1, 30, 39, 29, 10, 13]; console....

Computed Property Names is an ES6 feature which allows the names of object properties in JavaScript object literal notation to be determined dynamically, i.e. computed. JavaScript objects are really dictionaries, so it was always possible to dynamically create a string and use it as a key with the syntax object[‘property’] = value. However, ES6 Computed Property Names allow us to use dynamically generated names within object literals. Example: const myPropertyName = 'c' const myObject = { a: 5, b: 10, [myPropertyName]: 15 } console....

A typical switch statement in javascript looks like this example below: var type = 'coke'; var drink; switch(type) { case 'coke': drink = 'Coke'; break; case 'pepsi': drink = 'Pepsi'; break; default: drink = 'Unknown drink!'; } console.log(drink); // 'Coke' It’s similar to if and else statements below: function getDrink (type) { if (type === 'coke') { type = 'Coke'; } else if (type === 'pepsi') { type = 'Pepsi'; } else if (type === 'mountain dew') { type = 'Mountain Dew'; } else if (type === 'lemonade') { type = 'Lemonade'; } else if (type === 'fanta') { type = 'Fanta'; } else { // acts as our "default" type = 'Unknown drink!...