How do you make sure he selects one?

Question

I want him to select one instead of all.

if(input == ["1", "2"]) {

}

I expect the output is '1 or 2' but the actual output is '1,2'. He goes only further in the code if it is '1,2' as input.

Answer 1

You can use includes to check if the array contains a certain element

 var input = "2"; if ( ["1", "2"].includes(input) ) { console.log("Included"); } 

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Another option is using indexOf . This method returns the first index at which a given element can be found in the array, or -1 if it is not present.

 var input = "2"; if ( ["1", "2"].indexOf(input) !== -1 ) { console.log("Included"); } 

Answer 2

Use index.Of , it returns -1 when this is absent, otherwise it returns the index of the position.

input = ["1", "2"];

if(input.indexOf(you_value) != -1){}