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Golang perk series : (typed) arrays – JS vs. GO #3

#webdev #javascript #node #go

ARRAYS

  • UNTYPED ARRAYS

In JavaScript :

var nil_ = []; /* implicitly as type of int (use TS if you want to be sure) */ console.log(`${nil_.length == 0}\n`) // true
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In Golang :

var nil_ []int fmt.Println(len(nil_) == 0) // true
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  • TYPED ARRAYS
    • declarations :
  • TYPED ARRAYS
    • views :

In JavaScript :

/*var*/ primes = new ArrayBuffer(8) /*var*/ uint8 = new Uint16Array(primes) /*var*/ sliced_primes = uint8.slice() console.log(sliced_primes) // Uint16Array(4) [0, 0, 0, 0, buffer: ArrayBuffer(8), byteLength: 8, byteOffset: 0, length: 4, Symbol(Symbol.toStringTag): 'Uint16Array']
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In Golang :

func main() { primes := [4]int{} var sliced_primes []int = primes[0:len(primes)] fmt.Println(sliced_primes) } // try oneself on : @https://go.dev/play/
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NOTE : In JavaScript TypedArrays are limited of one specific type you choose to have in the container , whereas DataView (heterogenous data in fancy terms) can be used as a "translator" eliminating boundaries "of one type" for TypedArrays (homogenous data in fancy terms) .

TIP : with reference to explanation above , in Node.js
runtime we would use Buffer.from() !

  • Slicing the arrays :

In JavaScript :

 // Task : slice each season's months into dedicated variable & print it : function main(){ var full_year = ["Jan", "Feb", "March", "April", "May", "June", "July","August", "September", "October", "November", "December",] var winter = full_year.slice(0,2) winter.unshift(full_year[11]) var spring = full_year.slice(2,5) var summer = full_year.slice(5,8) var autumn = full_year.slice(8,11) console.log(full_year, winter, spring, summer, autumn) } main()
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In Golang :

package main import ( . "fmt" ) func main(){ full_year := []string{"Jan", "Feb", "March", "April", "May", "June", "July","August", "September", "October", "November", "December",} /* --- */ // Task : slice each season's months into dedicated variable & print it : var winter = append([]string{}, full_year[11], full_year[0], full_year[1]) var spring = full_year[2:5] var summer = full_year[6:9] var autumn = full_year[9:12] Println(full_year, winter, spring, summer, autumn) }
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