![]() It does not permit access to values outside a block of code, nor does it permit access to values from functional scope. We cannot access any variable declared with the const keyword outside the block of code. Prior to the introduction of the let and const keywords in the Es6 standard, the var keyword was the only keyword we could use in declaring variables. Variables declared within a functional scope, on the other hand, are not accessible outside of the functional scope. This is possible because of the var keyword used to declare the variable.ĭifferent values can be assigned and reassigned to a specific variable declared with the var keyword. This automatically changes the value contained in that variable to the second assigned value. Later on, we reassigned a second value to that same variable. Looking at the example above, initially we assigned the first value to a variable. When we need to access variables declared inside a block of code from outside the block, we use the var keyword because it gives us that access to the variable. ![]() ![]() There are several types of keywords used to declare variables in JavaScript, these are: Or we use the document.write method to print it into the HTML document. We can either use the console.log command to print it into the console. So how do we access the stored value? We simply use JavaScript commands to access the stored variable. In the preceding example, the variable has the var keyword and it has the name ‘values.’ Additionally, the value contained in the variable is “I am the stored value”. We begin by using the variable keyword ‘var’, then, we give the variable a specific name, next we use the assignment operator, and finally, we place the value. Let us consider the assignment of a value to a variable. We use the assignment operator to assign these values. To do this, you simply assign them to said variables. Just as items are stored in a container, or even a box, values or data are stored in variables. Variables are comparable to containers used to store items. In this article, we will understand what they are, when and how to use these data types and variables using good code examples. JavaScript also has various data types which are arrays, functions, strings, numbers, booleans and others. JavaScript has different types of variables which are confusing on when to use for some developers and they are the let, const and var keywords.
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