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Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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how do i test my javascript function such as this one

function props(list, propertyName){
var result=[];
for(var x in list) {
result.push(list[x][propertyName]);
}
return result;
}

the instuctions for this were as follows

props( list, propertyName )

This function takes a list of elements and a propertyName string as input. The function returns a list that is generated by obtaining the property-named value of an input element. If a list element doesn't have a property of the specified name, then its value is given as undefined.

Examples

var testing = [{ a:3, b:‘Cat’, c:true }, 13, { a:12, b:‘Hat’, c:false }, { cat:3, hat:‘3’, rat:false } ];
props( testing, ‘b’ ) => [ ‘Cat’, undefined, ‘Hat’, undefined ]
props( testing, ‘a’ ) => [3, undefined, 12, undefined ]
props( testing, ‘cat’ ) => [undefined, undefined, undefined, 3 ]

if there is an online ide that would work or anything would help! i just need to know how to test things like this for an assignment thank you!!

showing it working would be amazing as well thank yoU!!

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