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Daniel Chisu
Full Stack JavaScript Techdegree Student 4,321 PointsI can not just figure this out...
I tried all options but nothing works...
<!DOCTYPE html>
<html lang="en">
<head>
<title>JavaScript Foundations: Functions</title>
<style>
html {
background: #FAFAFA;
font-family: sans-serif;
}
</style>
</head>
<body>
<h1>JavaScript Foundations</h1>
<h2>Functions: Return Values</h2>
<script>
function arrayCounter(array) {
if(typeof array === array) {
return array.length;
}
if(typeof array === "undefined") {
return 0;
}
}
</script>
</body>
</html>
2 Answers
William Li
Courses Plus Student 26,868 PointsBecause this line typeof array === array is never going to work, typeof [1,2,3] will return object, use instanceof instead in this comparison .
[1, 2, 3] instanceof Array // => true
Daniel Chisu
Full Stack JavaScript Techdegree Student 4,321 PointsI will check later as for now I have to pack the luggage for a trip...Thanks William!
Daniel Chisu
Full Stack JavaScript Techdegree Student 4,321 PointsDaniel Chisu
Full Stack JavaScript Techdegree Student 4,321 Pointsthanks but this we haven't learn yet about this type of keyword...Hope it works!
William Li
Courses Plus Student 26,868 PointsWilliam Li
Courses Plus Student 26,868 Pointssorry about that, Daniel, I didn't take this course so I didn't know; but I look at the code challenge, according to description of problem, looks like you don't need to worry about checking whether it's Array. (since you mention you haven't learned
instanceofyet)You should first check if the input is 'string', 'number' or 'undefined', if so, return 0; otherwise, just return the array's length. Doing so should get you pass this challenge. hope that helps