JAVASCRIPT Built-in Objects: Prints

 

When we use console.log() we’re calling the .log() method on the console object. 

Let’s see console.log() and some real string methods in action!

• Data is printed, or logged, to the console, a panel that displays messages, with console.log().
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• We can write single-line comments with // and multi-line comments between /* and */.
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• There are 7 fundamental data types in JavaScript: strings, numbers, booleans, null, undefined, symbol, and object.
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• Numbers are any number without quotes: 23.8879
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• Strings are characters wrapped in single or double quotes: 'Sample String'
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• The built-in arithmetic operators include +, -, *, /, and %.
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• Objects, including instances of data types, can have properties, stored information. The properties are denoted with a . after the name of the object, for example: 'Hello'.length.
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• Objects, including instances of data types, can have methods which perform actions. Methods are called by appending the object or instance with a period, the method name, and parentheses. For example: 'hello'.toUpperCase().
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• We can access properties and methods by using the ., dot operator.
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• Built-in objects, including Math, are collections of methods and properties that JavaScript provides.
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//random number prints

console.log(Math.random() *100);

// * 100

console.log(Math.floor(Math.random() *100));

//ceil number, smaller than 43.8

console.log(Math.ceil(43.8));

// Integer number, false or true

console.log(Number.isInteger(2017));