While typing the value {2,4,45,50} on console displays 50, but assigning the {2,4,45,50} to variable getting the error
var a = {2,4,45,50}
Uncaught SyntaxError: Unexpected number
What is the concept on this.
1 Answer
its [] for arrays, the console just treats your {} like a block and gives you the last value – skara9
As Skara mentioned, [] is for arrays. {} is for tables, so when you assign it to a variable since it's a table it's expecting a key and value, for example: {a: 1, b:2, 3:4}. If you want an array then change {} to [], otherwise, you should assign a key and value for the table.
If you would like to log a specific value of an array you can do so using an index, index starts from 0 to the number of values. For example:
var a = [2,4,45,50]
console.log(a[0])
//Expected output is 2If you wanted to use a table and log the value of the first key, which in this case would be a, then you would do:
var test = {a:2, b:4, c:45, d:50}
console.log(test.a)
//Expected output is 2 because 2 is assigned to aYou could also just log the whole array and/or table.
[]for arrays, the console just treats your{}like a block and gives you the last valuevar a = [2, 4, 45, 50]?{1, 2, 3}does not make an array in JS, nor is it a valid expression, so of course assigning it to a variable will throw -- the{}creates a block, or a set of statements, and the console typically gives you the last value when given a set of expressions -- even typing1, 2, 3, 4, 5into the console yields5