Dynamic if statement in JS

Question

I have a function that looks through arrays and returns ether true or false and will change a global variable to the number that it found if it was above 0. I want to have a if statement that changes so if it is that number it'll call a different function based on that number without having multiple if statements. So something like

if(left == true){
    for(i=1;i<8;i++){
        if(leftnumber == i){
            //function based on i
        }
    }
}

Why don't you just make the function dynamic instead of the condition? Btw, what is the function and what does it do? — Jacob Finamore
– Jacob Finamore, Commented May 20, 2015 at 16:52

Austin Brunkhorst · Accepted Answer · 2015-05-20 16:52:00Z

1

You can use an object to lookup a function based on the number.

// object that stores functions based on "leftnumber"
var fnTable = { };

// when "leftnumber" is 6, this function will be called
fnTable[ 6 ] = function() { ... };

// ... for loop stuff

// attempt to find the function for the value at i
var lookup = fnTable[ i ];

// if it exists, call it
if (lookup)
    lookup( );

answered May 20, 2015 at 16:52

Austin Brunkhorst

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Comments

ptCoder · Accepted Answer · 2015-05-20 16:51:53Z

0

Something like this?

function myfunction(number){
    //do stuff
}

if(left == true){
    for(i=1;i<8;i++){
        if(leftnumber == i){
            myfunction(i);
        }
    }
}

answered May 20, 2015 at 16:51

ptCoder

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1 Comment

ptCoder Over a year ago

Or simple: if(left){ myfunction(leftnumber); }

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