MapReduceFilter
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function Person( n, a ){
this.name = n;
this.age = a;
}
var persons = [];
persons.push( new Person( "Ace", 1 ) );
persons.push( new Person( "Beta", 2 ) );
persons.push( new Person( "Zeta", 5 ) );
persons.push( new Person( "Eta", 9) );
persons.push( new Person( "Delta", 10 ) );
persons.push( new Person( "Theta", 0 ) );
console.log( persons );
console.log( persons.filter( filterAge ) );
console.log( persons.filter( filterName ) );
console.log( persons.map( names ) );
console.log( persons.map( ages ) );
console.log( persons.filter( function(target){ return target.age > 5 }).map( ages ).reduce( sum, 0 ) );
function filterAge( target ){
return target.age > 1;
}
function filterName( target ){
return target.name.indexOf( 0 ) === "A";
}
function names( target ){
if( target ){
return target.name;
} else {
return null;
}
}
function ages( target ){
if( target ){
return target.age;
} else {
return null;
}
}
function sum( accumulator, item ){
return accumulator + item;
}
JavaScript
INFO