Access Array Data with Indexes смотреть онлайн

JavaScript arrays are zero-indexed: the first element of an array is at index 0, the second is at index1 , and so on — and the last element is at the value of the array's length property minus 1.

What is a var in JavaScript? var is the keyword that tells JavaScript you're declaring a variable. x is the name of that variable. = is the operator that tells JavaScript a value is coming up next. 100 is the value for the variable to store.

What is a const in JavaScript? The const declaration creates block-scoped constants, much like variables declared using the let keyword. The value of a constant can't be changed through reassignment (i.e. by using the assignment operator), and it can't be redeclared (i.e. through a variable declaration).

What is an array in JavaScript? Arrays are used to store multiple values in a single variable. This is compared to a variable that can store only one value. Each item in an array has a number attached to it, called a numeric index, that allows you to access it. In JavaScript, arrays start at index zero and can be manipulated with various methods.

If you console.log(myArray[0]); you'll see the number 50 by itself.
If you console.log(myArray[1]); you'll see the number 60 by itself.
If you console.log(myArray[2]); you'll see the number 70 by itself.