Detect if parameter passed is an array? Javascript [duplicate]

Answer 1

You can test the constructor property:

if (param.constructor == Array) {
    ...
}

Though this will include objects that have an array prototype,

function Stack() {
}
Stack.prototype = [];

unless they also define constructor:

Stack.prototype.constructor = Stack;

or:

function Stack() {
    this.constructor = Stack;
}