Monday 12 June 2017
javascript - Pass unknown number of parameters to JS function
Answer
Answer
A pattern in some javascript libraries is to be able to pass any number of parameters to a function:
functiona(param1)
functiona(param1, param2, param3)
functiona(param1, param2)
I have an array of unknown length, and I'd like to pass all the array items as parameters to a function like functiona(). Is this possible? If so, what is the syntax for doing this?
Answer
What you want is probably Function.prototype.apply().
Usage:
var params = [param1, param2, param3];
functiona.apply(this, params);
As others noted, functiona declaration may use arguments, e.g.:
function functiona()
{
var param1 = this.arguments[0];
var param2 = this.arguments[1];
}
But it can use any number of normal parameters as well:
function foo(x, y)
{
console.log(x);
}
foo.apply(this, [10, 0, null]); // outputs 10
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