Lesson: 19 | Numbers

Notes

JavaScript has only one type of number. Numbers can be written with or without decimals.

A number without decimal.

let x = 12;

A number with decimal.

let y = 0.04;

Extra large or extra small numbers can be written with scientific (exponent) notation:

let x = 24e6    //24000000
let y = 2e-6    //0.000002

If you add two numbers, the result will be a number:

let x = 5;
let y = 12;
document.write(x+y)    //17

If you add two strings, the result will be a string concatenation:

let x = '5';
let y = '3';
document.write(x+y)    //53

If you add a number and a string, the result will be a string concatenation:

let x = 5;
let y = '3';
document.write(x+y)    //53

If you add a string and a number, the result will be a string concatenation:

let x = '5';
let y = 3;
document.write(x+y)    //53

JavaScript will try to convert strings to numbers in all numeric operations:

let x = '12';
let y = '3';
document.write(x/y)  //12/3=4
document.write(x-y)  //12-3=9
document.write(x*y)  //12*3=36

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