Flexible argument passing for functions.
You're a mathematical genius assigned to build devastating high density plasma
rifles to help protect the human race against the alien invasion. You're writing
the software for the gun and need to create a function called
euclideanDistance so that the rifle can employ a highly accurate
auto-targeting system. This function will calculate the distance between 2
points in a three-dimensional space and will be called from many places in the
code. For convenience's sake, you'd like to be able to pass arguments in a
few different formats. You decide to use @razic's function-signatures
component because you know it's well tested and means you don't have to write
stupid error checking tests for the many different ways you may accidentally
call your function with an incorrect function signature.
component install razic/function-signatures
// Require the functionvarfunctionSignatures=require('function-signatures');// Initialize a `functionSignatures` objectvarsignatures=newfunctionSignatures({"six numbers": function(x1,y1,z1,x2,y2,z2){returntypeofx1==='number'&&typeofy1==='number'&&typeofz1==='number'&&typeofx2==='number'&&typeofy2==='number'&&typeofz2==='number';},"two objects, each with x, y and z properties": function(a,b){returntypeofa.x==='number'&&typeofa.y==='number'&&typeofa.z==='number'&&typeofb.x==='number'&&typeofb.y==='number'&&typeofb.z==='number';},"two arrays, each having three numbers": function(a,b){returnainstanceofArray&&binstanceofArray&&a.length===3&&b.length===3&&typeofa[0]==='number'&&typeofa[1]==='number'&&typeofa[2]==='number'&&typeofb[0]==='number'&&typeofb[1]==='number'&&typeofb[2]==='number';},"one array with six numbers": function(ab){returnabinstanceofArray&&ab.length===6&&typeofab[0]==='number'&&typeofab[1]==='number'&&typeofab[2]==='number'&&typeofab[3]==='number'&&typeofab[4]==='number'&&typeofab[5]==='number';}});// Add event handlers to normalize the argumentssignatures.on("six numbers",function(x1,y1,z1,x2,y2,z2){this.x1=x1;this.y1=y1;this.z1=z1;this.x2=x2;this.y2=y2;this.z2=z2;});signatures.on("two objects, each with x, y and z properties",function(a,b){this.x1=a.x;this.y1=a.y;this.z1=a.z;this.x2=b.x;this.y2=b.y;this.z2=b.z;});signatures.on("two arrays, each having three numbers",function(a,b){this.x1=a[0];this.y1=a[1];this.z1=a[2];this.x2=b[0];this.y2=b[1];this.z2=b[2];});signatures.on("one array with six numbers",function(ab){this.x1=ab[0];this.y1=ab[1];this.z1=ab[2];this.x2=ab[3];this.y2=ab[4];this.z2=ab[5];});// Write your methodfunctioneuclideanDistance(){// Normalize the argumentssignatures.normalize(arguments);// Use the normalized argumentsvardx=signatures.x2-signatures.x1;vardy=signatures.y2-signatures.y1;vardz=signatures.z2-signatures.z1;// ProfitreturnMath.sqrt(Math.pow(dx,2)+Math.pow(dy,2)+Math.pow(dz,2));}MIT