Walid: Lua Operators

2016-07-06T02:33:44Z

Lua Operators

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{| class="wikitable" style="width: 30%; margin: auto"
|-
! scope="col"|
! scope="col"| Operators
|-
! scope="row" | Arithmetic
| style="text-align:center" | `+´ , `-´ , `*´ , `/´ , `-´ , `^´
|-
! scope="row"| Relational
| style="text-align:center" | `<´ , `>´ , `<=´ , `>=´ , `==´ , `~=´
|-
! scope="row"| Logical
| style="text-align:center" | `and´, `or´, `not´
|-
! scope="row"| Misc
| style="text-align:center" | `..´, `#´
|}

==Arithmetic Operators==

Following table shows all the arithmetic operators supported by Lua language.

{| class="wikitable" style="width: 50%;"
|-
! scope="col"| Operator
|-
| `+´ (addition) : Adds two operands Ex: 1 + 5 = 6
|-
| `-´ (subtraction): Subtracts second operand from the first Ex: 10-30 = -20
|-
| `*´ (multiplication): Multiply both operands Ex: 5 * 3 = 15
|-
| `/´ (division): Divide numerator by de-numerator Ex: 8 / 2 = 4
|-
| `^´ (exponentiation): Exponent Operator takes the exponents Ex: 5 ^ 2 = 25
|}

===Examples===

<syntaxhighlight lang="lua">
local W = 5
local M = 10

outputChatBox(W + M) -- Addition: 15
outputChatBox(W - M) -- Subtraction: -5
outputChatBox(W * M) -- Multiplication: 50
outputChatBox(W / M) -- Division: 0.5
outputChatBox(W^2) -- Exponentiation: 25
</syntaxhighlight>

==Relational Operators==

Relational operators are supplied which return the boolean values true or false.

{| class="wikitable" style="width: 50%;"
|-
! scope="col"| Operator
|-
| `==´ (equal to) : Example (5 == 6) false
|-
| `~=´ (not equal to) : Example (5 ~= 6) true
|-
| `<´ (less than) : Example (5 < 6 ) true
|-
| `>´ (greater than) : Example (5 > 6 ) false
|-
| `<=´ (less than or equal to) : Example (5 <= 6 ) true
|-
| `>=´(greater than or equal to) : Example (5 >= 6 ) false
|}

===Examples===
<syntaxhighlight lang="lua">
local W = 5
local M = 10

-- Example 1 : == Equal to
if( W == M ) then
outputChatBox(W.." is equal to "..M )
else
outputChatBox(W.." is not equal to "..M )
end

-- Example 2 : ~= Not equal to
if( W ~= M ) then
outputChatBox(W.." is not equal to "..M )
else
outputChatBox(W.." is equal to "..M )
end

-- Example 3 : < less than
if ( W < M ) then
outputChatBox(W.." is less than "..M )
else
outputChatBox(W.." is not less than "..M )
end

-- Example 4 : Greater than
if ( W > M ) then
outputChatBox(W.." is greater than "..M)
else
outputChatBox(W.." is not greater than "..M )
end

-- Example 5 : <= less than or equal to
if ( W <= M ) then
outputChatBox(W.."is either less than or equal to "..M )
end

-- Example 6 : >= greater than or equal to
if ( M >= W )
outputChatBox(M.." is either greater than or equal to "..W )
end</syntaxhighlight>

{{Note|These also work on strings (alphabetical order) and other types.}}

==Logical Operators==

Following table shows all the logical operators supported by Lua language.

{| class="wikitable" style="width: 50%;"
|-
! scope="col"| Operator
|-
| `and´: (Called Logical AND operator) Example:(true and false) is false
|-
| `or´: (Called Logical OR Operator) Example:(true or false) is true
|-
| `not´: (Called Logical NOT Operator) Example: (not true) is false
|}

==Misc Operators==

Also there is Miscellaneous operators supported by Lua Language include concatenation and length.

{| class="wikitable" style="width: 50%;"
|-
! scope="col"| Operator
|-
| `..´ : Concatenates two strings.
|-
| `#´ : An unary operator that return the length of the a string or a table.
|}

===Examples===

<syntaxhighlight lang="lua">
W = "Hello"
M = "Everybody"

-- Example 1 : Concatenates two strings.
outputChatBox(W.." "..M) -- Result: Hello Everybody

-- Example 2:
outputChatBox(#W) -- Result: 5
</syntaxhighlight>
[[Category:Scripting Concepts]]

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Walid: Lua Operators