Suppose there is a number given:
let num = 969
The goal is to separate this number into an array of digits. The first two techniques fail, but the third one succeeds. What makes the third method different from the first two?
num + ''.split('') // '969'
num.toString() + ''.split('') // '969'
String(num).split('') // [ '9', '6', '9' ]
Alright, let's see how this functions
num + ''.split('') operates as follows
num is a numerical value''.split('') represents an empty array and is not a numbernum becomes '969', [] becomes '' (empty string)num.toString() + ''.split('') functions like
num.toString() is a string[] to
string[] converts to '' (empty string)String(num).split('') works in the following way
num into a stringGive this method a try and you will quickly see the difference!
(num + '').split('') // [ '9', '6', '9' ]
(num.toString() + '').split('') // [ '9', '6', '9' ]
String(num).split('') // [ '9', '6', '9' ]
The first and second lines involve splitting '' which is an empty string.
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