How exactly does
Math.max.apply(null, arr);
work?
Let's take for example
var arr = [45,25,4,65] ;
Will it compare 'null' and '45' and return the maximum number between the two, like 45?
After comparing, will it then compare the returned number with the next number in the array, such as 25, and return the maximum number?
And how is this calculation performed internally? I believe it follows the same process.
The primary parameter of the apply method determines the value of this within the function being called. In the given scenario, the value of this is inconsequential since the function does not rely on a specific this value. However, in certain situations, it can be crucial, as demonstrated below:
var example = {
status: true,
behavior: function() {
return this.status;
}
};
var sample = { status: false };
example.behavior(); // true
example.behavior.apply(sample); // false
This is considered to be the same as
Math.max(...numbers);
Which is equivalent to:
Math.max(12, 56, 3, 78);
The inner workings of this operation are handled by the browser's or parser's built-in functionality. In JavaScript, it could look something like this:
Math.max = (...values) => {
let maximum = -Infinity;
for(const num of values)
if(num > maximum) maximum = num;
return maximum;
};
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