how to set a var in javascript code example

Example 1: javascript declare a variable

//choose the best for your solution
var myVariable = 22; //this can be a string or number. var is globally defined

let myVariable = 22; //this can be a string or number. let is block scoped

const myVariable = 22; //this can be a string or number. const is block scoped and can't be reassigned

Example 2: js var

var a;
console.log(a);                // scrive in console "undefined" o "" a seconda del browser usato.
console.log('still going...'); // scrive in console "still going...".

Example 3: how to define variable in javascript

var <variable-name>;

var <variable-name> = <value>;

Example 4: how to assign variables in javascript

// data from json: resp = {"home": 1, "landmark": 2}
// Method 1: 
// use ` for add variable
url = `workspace/detail/${resp.home}`;
console.log(url) -> // workspace/detail/1
  
// Method 2: 
// use ' and + for concentrace variable
url = 'workspace/detail/' + resp.home;
console.log(url) -> // workspace/detail/1