Boolean() function in JavaScript
By: Stella in Javascript Tutorials on 2023-04-25
The Boolean() function in JavaScript is used to convert a value into a boolean data type. The function takes a single parameter and returns true or false.
The function can be called in two ways: with the new operator or without it. If called with the new operator, it creates a new Boolean object. If called without the new operator, it returns a boolean primitive.
When the parameter is a primitive value, the function returns true for truthy values and false for falsy values. The following values are considered falsy in JavaScript:
false0(zero)""(empty string)nullundefinedNaN(Not-a-Number)
All other values are considered truthy.
Here are some examples:
Boolean(true); // true
Boolean(false); // false
Boolean(0); // false
Boolean(1); // true
Boolean(""); // false
Boolean("hello"); // true
Boolean(null); // false
Boolean(undefined);// false
Boolean(NaN); // false
It's important to note that the Boolean() function is not the same as the boolean keyword in JavaScript. The boolean keyword is used to declare a variable as a boolean data type, while the Boolean() function is used to convert a value into a boolean data type.
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