I'm perplexed by the discrepancy in results between these two scenarios:
var arr1=[a,b,c,d,e];
console.log(arr1[0].length); /* undefined */
var str='a b c d e';
var arr2=str.split(' ');
console.log(arr2[0].length); /* 1 */
Can someone explain the difference to me?
The mistake isn't occurring on the second line, but actually on the very first line when you're using a without single quotes (').
This is because the variable a hasn't been defined yet...
Pay close attention to the error message:
ReferenceError: a is not defined
How to resolve this:
var arr1 = ['a', 'b', 'c', 'd', 'e'];
In the array arr1 = [a,b,c,d], if the variables a, b, c, d are defined as iterables (such as strings or arrays), then accessing arr1[0].length will produce a defined output. Here is an example:
let a = "ab"
let b = "b"
let c = "c"
let d = "de"
let arr1 = [a, b, c, d]
console.log(arr1[0].length)
// Output: 2The reason for this happening is due to an error in your initial array declaration. To rectify this issue, make sure to encapsulate your array elements within quotation marks.
var arr1=['a','b','c','d','e'];
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