Installation:

npm i --save whatif-jsyarn add whatif-js

require("whatif-js");

Usage

WhatIf

Examples:

letobj={name:"Awesome App",type:"App"};obj=obj.whatIf(obj.type==="App",function(){this["description"]="I am an awesome app.";});//output =//{//  name: 'Awesome App',//  type: 'App',//  description: 'I am an awesome app.'//}

letarray=[0,1,2,3,4,5];array=array.whatIf(array.length===6,ctx=>{returnctx.concat(6,7,8,9);}).slice(2,4).join(",");//output = 2,3,4,5,6,7,8,9

functionworkingWithBoolean(stopWork){stopWork.whatIf(function(){console.log("Stop all the work!");});}

functioncalculateSimple(doMultiplication,doDivision){//three methods for three mathematical operationsfunctionadd(...params){returnparams.reduce((p,c)=>p+c);}functionmultiply(...params){returnparams.reduce((p,c)=>p*c);}functiondivide(...params){returnparams.reduce((p,c)=>p/c);}//the values to work withletparamaters=[21,23,41,51,5,1];//the resultletresult=add//perform add if both parameters are false.whatIf(doMultiplication,multiply)//this will only be executed if doDivision=false & doMultiplication=true.whatIf(doDivision,divide)//if doDivision=true, it will always take precedence no matter the value of doMultiplication.call(this, ...paramaters);//the final function callreturnresult;}

calculateSimple(false,false);//142calculateSimple(false,true);//0.0000873307965816231calculateSimple(true,false);//5049765calculateSimple(true,true);//0.0000873307965816231

WhatIfNotNull

let person= getPersonByUsername("John Doe");person.whatIfNotNull(    function() {      console.log("person is not null.");    },    function() {      console.log("person is null");    });

WhatIfNotUndefined

WhatIf With Different Return Type

letstringLength="i am a string".whatIf(getLength,function(){returnthis.length;});

WhatIfNotNullOrEmpty

anyArray.whatIfNotNullOrEmpty(  function() {    console.log("array is not null or empty.");  },  function() {    console.log("array is null or empty");  });

Using Arrow Functions

anyArray.whatIfNotNullOrEmpty(ctx=>console.log("array is not null or empty."),ctx=>console.log("array is null or empty"));

Find this library useful? ❤️

License

Copyright 2019 thecodrr (Abdullah Atta)Licensed under the Apache License, Version 2.0 (the "License");you may not use this file except in compliance with the License.You may obtain a copy of the License at   http://www.apache.org/licenses/LICENSE-2.0Unless required by applicable law or agreed to in writing, softwaredistributed under the License is distributed on an "AS IS" BASIS,WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.See the License for the specific language governing permissions andlimitations under the License.