create a variant in javascript

In JavaScript, a variant is a dynamic data type that can hold different types of values like string, number, boolean, undefined or null. The variables declared without a data type are automatically handled as variants.

let myVariant;

myVariant = 42; // myVariant is now a number
myVariant = "hello world"; // myVariant is now a string
myVariant = true; // myVariant is now a boolean
myVariant = undefined; // myVariant is now undefined
myVariant = null; // myVariant is now null
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It's important to note that using variants can sometimes lead to unexpected results, especially when working with strict mode enabled. It is a good practice to always use the typeof operator to check the type of data before using them.

let myVariant = "hello world";
console.log(typeof myVariant); // output: string

myVariant = 42;
console.log(typeof myVariant); // output: number
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In strict mode, an error will occur if you try to use a variable that has not been declared. This can also help prevent unexpected results when working with variants.

'use strict';

myVariant = "hello world"; // Throws an error

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By using strict mode, typos in variable names will throw an error, and you'll be warned of implicit global variables.