Checking Whether an Array Contains an Item
Often you will need to check whether an array contains a certain item. You can do this by using the indexOf()
method. If the code does not find the item in the list, it returns a -1
. The following function writes a message to the console if an item is in the week
array:
function message(day){ var week = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday"]; if (week.indexOf(day) != -1){ console.log("Happy " + day); }}
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