I am learning JavaScript and i came across this problem. I want to catch an input value using document.formName.elementName.valueand compare that value with an instance of an Array object.If the value exists it will throw an alert!.
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4 Answers
I think that has been asked thousands of times:
if(myFancyArray.indexOf(document.formName.elementName.value) !== -1){
alert("You did something wrong!");
}
Watch out as old versions of IE don’t know indexOf. (but who needs IE?)
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You can add a convenience method to JavaScript's Array
Array.prototype.includes = function(element) {
var found = false;
for (var i = 0; i < this.length; i++) {
if (this[i] == element) {
found = true;
}
}
return found;
}
And, then, you can use below code to get some syntactic sugar
var myArray = [0,1,"hello","world"];
console.log(myArray.includes("hello")); //prints true
console.log(myArray.includes(10)); //prints false
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