1// inside if else check
2if(Array.isArray(myVarToTest)) {
3	// myVatToTest is an array
4} else {
5	// myVarToTest is not an array
6}

1var colors=["red","green","blue"];
2
3if(Array.isArray(colors)){
4    //colors is an array
5}

1if(Array.isArray(colors)){
2    //colors is an array
3}

1if(Array.isArray(myVarToTest)) {
2	// myVatToTest is an array
3} else {
4	// myVarToTest is not an array
5}

1
2function isArray(value) {
3    return Object.prototype.toString.call(value) === "[object Array]";
4}