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When utilizing a dot, the word after the dot is the literal name of the property. When using square brackets, the expression between the brackets is evaluated to get the property name. Whereas value.x fetches the property of value named “x”, value tries to judge the expression x and uses the result, converted to a string, as the property name. If you attempt to access a property on certainly one of these nonvalues, you get an error.

We’ve seen a few suspicious-wanting expressions like myString.length and Math.max in previous chapters. These are expressions that entry a property of some value.

In the first case, we access the size property of the value in myString. In the second, we access the property named max within the Math object (which is a set of arithmetic-related constants and features). We could get inventive with strings—in spite of everything, strings can have any length, so we can put lots of data into them—and use ” ” as our representation.


data structures

Similarly, though a const binding to an object can itself not be modified and can continue to level at the identical object, the contents of that object may change. The object1 and object2 bindings grasp the same object, which is why altering object1 also modifications the worth of object2.

The binding object3 points to a different object, which initially accommodates the same properties as object1 but lives a separate life. You can change their properties, causing a single object worth to have completely different content at different times. The push methodology provides values to the end of an array, and the pop methodology does the opposite, removing the final value within the array and returning it. Properties that contain features are typically called strategies of the value they belong to, as in “toUpperCase is a technique of a string”. Interestingly, despite the fact that the decision to toUpperCase doesn’t pass any arguments, the function by some means has entry to the string “Doh”, the worth whose property we known as. The two major methods to entry properties in JavaScript are with a dot and with sq. brackets. Both worth.x and worth entry a property on value—but not necessarily the same property.