# Operators

# Arithmetic operators

operator	description	example	result
`+`	addition	`x + y`	sum of `x` and `y`
`-`	subtraction	`x - y`	difference of `x` and `y`
`*`	multiplication	`x * y`	product of `x` and `y`
`/`	division	`x / y`	quotient of `x` and `y`
`%`	modulus	`x % y`	remainder/rest of `x` divided by `y`
`**`	power	`x ** y`	`x` to the power `y`
`++`	post/pre increment	`x++` `++x`	post increment `x` pre increment `x`
`--`	post/pre decrement	`x--` `--x`	post decrement `x` pre decrement `x`

let x = 10;
let y = 3;

const example = `Arithmetic operators:
**************************
x = ${x}
y = ${y}
x + y = ${x + y}
x - y = ${x - y}
x * y = ${x * y}
x / y = ${x / y}
x % y = ${x % y}
x ** y = ${x ** y}
`;

console.log(example);

// post increment
const post = `Post increment (x++):
***************************************
x = ${x}       x starts at 10
x++ = ${x++}     x has not incremented yet!
x = ${x}
`;

console.log(post);

// pre increment
const pre = `Pre increment (++y):
***************************************
y = ${y}       y starts at 3
++y = ${++y}     y has has already been incremented
y = ${y}
`;

console.log(pre);
 
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REMARK

The + operator can also be used to concatenate strings

const name = "John";
const surName = "Doe";
const fullName = name + " " + surName; // fullName = 'John Doe'
 
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# Assignment operators

operator	description	example	result
`=`	assign	`x = y`
`+=`	add and assign	`x += y`	`x = x + y`
`-=`	subtract and assign	`x -= y`	`x = x - y`
`*=`	multiply and assign	`x *= y`	`x = x * y`
`/=`	divide and assign quotient	`x /= y`	`x = x / y`
`%=`	divide and assign modulus	`x %= y`	`x = x % y`

let x = 10;
const y = 2;
const z = 3;

let example = `Assignment operators:
----------------------------\n`;
x += y;
example += `x += y => (10 + 2) => x = ${x}\n`;
x -= z;
example += `x -= z => (12 - 3) => x = ${x}\n`;
x *= z;
example += `x *= z => (9 * 3)  => x = ${x}\n`;
x /= z;
example += `x /= z => (27 / 3) => x = ${x}\n`;
x %= y;
example += `x %= y => (9 % 2)  => x = ${x}`;

console.log(example);
 
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# Comparison operators

operator	description	example	result
`==`	equal	`x == y`	`true` if `x` is equal to `y`
`===`	identical	`x === y`	`true` if `x` is equal to `y` AND they are of the same type
`!=`	not equal	`x != y`	`true` if `x` is not equal to `y`
`!==`	not identical	`x !== y`	`true` if `x` is not equal to `y` OR they are not of the same type
`<`	less than	`x < y`	`true` if `x` is less than `y`
`<=`	less than or equal to	`x <= y`	`true` if `x` is less than or equal to `y`
`>`	greater than	`x > y`	`true` if `x` is greater than `y`
`>=`	greater than or equal to	`x >= y`	`true` if `x` is greater than or equal to `y`

const x1 = 10;
const x2 = "10";
const y = 5;

const example = `Comparison operators:
----------------------------
x1 == x2    => ${x1 == x2}
x1 === x2   => ${x1 === x2}
x1 !== y    => ${x1 !== y}
x1 < y      => ${x1 < y}
x1 > y      => ${x1 > y}`;

console.log(example);
 
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# Logical operators

operator	example	result
`&&`	`x && y`	`true` if both `x` AND `y` are true
`\|\|`	`x \|\| y`	`true` if either `x` OR `y` is true
`!`	`!x`	`true` if `x` is `false` (NOT `true`)

const x = 6;
const y = 4;

const example = `Logical operators:
*****************************
(x < 8 && y > 3)    => ${x < 8 && y > 3}
(x < 8 && y > 6)    => ${x < 8 && y > 6}
(x < 8 || y > 3)    => ${x < 8 || y > 3}
!(x < 8 || y > 6)   => ${!(x < 8 || y > 6)}
`;

console.log(example);
 
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