passing the parameters as an array

Question

I\'ve used a preload() method:

preload(\'img-1\',\'img-2\',...,\'img-num\')

Which works fine. But now I wanted to place all that parameters

Answer 1

You can use preload.apply (apply is available from the Function object's, Function.prototype.apply), which can spread out an array of data as arguments, like this

preload.apply(this, myArray);

For example,

function printer(first, second, third) {
    console.log(first, second, third);
}

printer(1, 2, 3);
# 1 2 3
printer([1, 2, 3]);
# [1, 2, 3] undefined undefined
printer.apply(this, [1, 2, 3]);
# 1 2 3

Since the number of arguments can vary, people normally use arguments special object.

You can get the list of arguments as an array, within the function, like this

function printer() {
    console.log(Array.prototype.slice.call(arguments));
}

printer(1, 2, 3);
# [ 1, 2, 3 ]
printer([1, 2, 3]);
# [ [ 1, 2, 3 ] ]
printer.apply(this, [1, 2, 3]);
# [ 1, 2, 3 ]