DeepType | Deep Learning Approach to Identifying Breast Cancer | Machine Learning library

Whenever we call toString on an object it returns "[object type]", where type is the object type. So the goal of the type(obj, showFullClass) is to extract the type from 'toString' output string.

1.What is the 'showFullClass' argument in the function declaration?

showFullClass is a boolean type. So if pass true in it , It will just return the output of toString without any processing. E.g. type(new Date(),true) will return [object Date]

1. What var deepType = Object.prototype.toString.call(obj).slice(8,-1).toLowerCase(); do?

It extracts the type substring of "[object type]" string and then convert it into lowercase. Which starts at 8th index of the string till the second last index of string. -1 means string extraction should end just before the last index(-1) of string. E.g. If obj is date object deepType value will be 'date'

1. What return deepType.match(/^(array|bigint|date|error|function|generator|regexp|symbol)$/) ? deepType :(typeof obj === 'object' || typeof obj === 'function') ? 'object' : typeof obj; do?

It checks if deepType matches to either "array" or "bigint" or "date" or "error" or "function" or "generator" or "regexp" or "symbol" then it returns deepType.

Otherwise if typeof obj is 'object' or 'function' return 'object'.

Otherwise for primitive types like string,number,etc return its type.