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146
VisualizaçõesFactory Function JS
Hello, Can someone please explain me this const {r,g,b} = this;
Why it has no variable name, if 'this' is the variable name, to what
that 'this' pointing to?
function makeColor(r, g, b) {
const color = {};
color.r = r;
color.g = g;
color.b = b;
color.rgb = function () {
const { r, g, b } = this;
return `rgb(${r},${g},${b})`
}
}
3 Respostas
Responde à pergunta0
The word 'this' is not a variable. This is a relatively new concept. they call it object destructuring syntax.
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"this" is a special property of methods. When a function is called as a method of an object, as it is here, "this" refers to that object, in this case the color object, so the color.rgb() method will return the string "rgb(r,g,b)" where the r, g, and b there are the values fed to the makeColor function used to create that object.
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Variable this not even exits, this is one of the reversed words(such as break, for, function, let etc.), this in context you show directs to color constant, so in context you show this equals to color constant.
More about this at MDN.