public/subjects/is.en.md

Is

Instructions

Add new function properties to the object `is`` to check a value type

• 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

Notions

• https://nan-academy.github.io/js-training/examples/primitive-and-operators
• https://devdocs.io/javascript/operators/typeof
• https://developer.mozilla.org/en-US/docs/Glossary/Truthy
• https://developer.mozilla.org/en-US/docs/Glossary/Falsy

Code provided

const is = {}