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[].concat()
//该函数作用是合并元素到数组中,如果被合并的元素是数组会自动展开

var arr=new Array(16)//16 个undefined 
var arr2=new Array(16)
arr2.fill('')

var inventory = [
    {name: 'apples', quantity: 2},
    {name: 'bananas', quantity: 0},
    {name: 'cherries', quantity: 5}
];

function findCherries(fruit) { 
    return fruit.name === 'cherries';
}

console.log(inventory.find(findCherries)); // { name: 'cherries', quantity: 5 }
//get element immediately
//will not change inventory

var ps = p.productions.filter(function(e) {
				return e.left == Nterminal
			})
//get a filtered array

arr.splice($.inArray(target,arr),1);
arr.splice(arr.indexOf(target),1);