To summarize: unless someone changes it using call/apply/bind or you are inside of an arrow function, this refers to whatever is left of the last dot at the point of invocation.
button.click();// this === buttonwhatIsThis();// this === undefined (or the global/window object in non-strict context, because whatIsThis === window.whatIsThis)newPhone.useApps()// this === newPhone
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To summarize: unless someone changes it using call/apply/bind or you are inside of an arrow function,
thisrefers to whatever is left of the last dot at the point of invocation.