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  1. \n

    what is a dataType means

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    It means that kind of data requried for a particular action in programming language different type of datatypes in js described below:-

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    2. \n
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    Primitive

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    Numeric(any number like1,2,3etc..),Boolean(true,false),Null,Undefined,String(\"\")

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    3. \n
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    Non-Primitive

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    Array([])(contains key value set where key is index and the value any dataType),Objects({}(key is string and value can be any dataType))

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    4. \n
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Examples:-

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Numeric

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let n = 123;\nn = 12.345;
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String

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let str = \"Hello\";\nlet str2 = 'Single quotes are ok too';
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Boolean

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let nameFieldChecked = true; // yes, name field is checked\nlet ageFieldChecked = false; // no, age field is not checked
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Null

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let age = null;
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Undefined

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let x;\n\nalert(x); // shows \"undefined\"
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Array

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let fruits = [\"Apple\", \"Orange\", \"Plum\"];
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Objects

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let user = {     // an object\n  name: \"John\",  // by key \"name\" store value \"John\"\n  age: 30        // by key \"age\" store value 30\n};
","frontmatter":{"title":"DataTypes in javaScript","date":"September 07, 2019","description":" Explanations of DataTypes in js "}}},"pageContext":{"isCreatedByStatefulCreatePages":false,"slug":"/dataTpes in js/","previous":{"fields":{"slug":"/functions in js/"},"frontmatter":{"title":"Functions in js"}},"next":{"fields":{"slug":"/typeConversion/"},"frontmatter":{"title":"TypeConversion In Js"}}}}}