How to check if a variable is array type in Javascript
Description
We have two ways to check if a variable is an array. The first method
is to use instanceof operator.
if (value instanceof Array){
//do something on the array
}
The second one is to use Array.isArray() method.
if (Array.isArray(value)){
//do something on the array
}
Example
var colors = ["A", "B", "C"];
//creates an array with three strings
// w w w. j a v a2s .co m
if (Array.isArray(colors)){
console.log("colors is an array");
}
The code above generates the following result.
