function combinedFunc(a = 0){
this.res = a;
}
combinedFunc.prototype.add = function(b){
this.res += b;
return this;
};
combinedFunc.prototype.deduct = function(b){
this.res -= b;
return this;
};
combinedFunc.prototype.mult = function(b){
this.res *= b;
return this;
};
combinedFunc.prototype.div = function(b){
this.res /= b;
return this;
};
combinedFunc.prototype.inc = function(){
this.res++;
return this;
};
combinedFunc.prototype.valueOf = function(){
return this.res;
};
var cf = new combinedFunc(0);
console.log(cf.add(6).mult(2).div(3).deduct(2).inc() == 3);
const scope = (val) => {
return {
add: add.bind(val),
multiply: multiply.bind(val),
divide: divide.bind(val),
deduct: deduct.bind(val),
inc: inc.bind(val),
valueOf() {
return val;
}
};
};
function add(val) {
'use strict';
val = (this || 0) + val;
return scope(val);
}
function multiply(val) {
'use strict';
val = (this || 0) * val;
return scope(val);
}
function divide(val) {
'use strict';
val = (this || 0) / val;
return scope(val);
}
function inc(val) {
'use strict';
val = (this || 0)+1;
return scope(val);
}
function deduct(val) {
'use strict';
val = (this || 0) - val;
return scope(val);
}
console.log(
add(6).multiply(2).divide(3).deduct(2).inc().deduct(0) == 3
);
