public/subjects/is

Is

Instructions

Add new function properties to the is object to check value types. Each function should take one argument, and return a boolean.

• is.num: value is a number.
• is.nan: value is NaN.
• is.str: value is a string.
• is.bool: value is a boolean.
• is.undef: value is undefined.
• is.def: value is defined.
• is.arr: value is an array.
• is.obj: value is a simple object or null objects.
• is.fun: value is a function.
• is.truthy: value is truthy.
• is.falsy: value is falsy.

Examples

console.log(is.num(5))
// output: true

console.log(is.num('ciao'))
// output: false

Notions

• Primitives and operators
• typeof
• Truthy
• Falsy

Code provided

The provided code will be added to your solution, and does not need to be submitted.

const is = {}