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Getting array of school values from all objects using JS

Hello I am new to the JavaScript language.

I have a table1.data property that’s an array of objects with data about a school like:

{ schoolName: "School 1", telephone: "123456", address: "1st street, 1st road" }

Can I perhaps get an array of the telephone values from all the objects using JS? Please help.

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Answer

All you need to do it traverse the items in the data, while grabbing the telephone field value.

Here is the long-way:

const table1 = {
  data: [
    { schoolName: "School 1", telephone: "(111) 111-1111", address: "1st street" },
    { schoolName: "School 2", telephone: "(222) 222-2222", address: "2nd street" },
    { schoolName: "School 3", telephone: "(333) 333-3333", address: "3rd street" }
  ]
};

const phoneNumbers = [];
for (let i = 0; i < table1.data.length; i++) {
  phoneNumbers.push(table1.data[i].telephone);
}

console.log(phoneNumbers);
.as-console-wrapper { top: 0; max-height: 100% !important; }

Here is the short way:

const table1 = {
  data: [
    { schoolName: "School 1", telephone: "(111) 111-1111", address: "1st street" },
    { schoolName: "School 2", telephone: "(222) 222-2222", address: "2nd street" },
    { schoolName: "School 3", telephone: "(333) 333-3333", address: "3rd street" }
  ]
};

const phoneNumbers = table1.data.map(({ telephone }) => telephone);

console.log(phoneNumbers);
.as-console-wrapper { top: 0; max-height: 100% !important; }
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