配列というか JSON オブジェクトの検索に。
const fruits = [
{
"name":"Apple",
"price":100,
"color":"red"
},
{
"name":"Orange",
"price":150,
"color":"orange"
},
{
"name":"Strawberry",
"price":200,
"color":"red"
},
{
"name":"Pineapple",
"price":250,
"color":"yellow"
}
]
const nameFilteredFruits = fruits.filter( function(fruit) {
return fruit.name === 'Apple'; //名前が「Apple」なもの
})
console.log(nameFilteredFruits)
//[{name: "Apple", price: 100, color: "red"}]
const priceFilteredFruits = fruits.filter( function(fruit) {
return fruit.price <= 150; //値段が150円以下のもの
})
console.log(priceFilteredFruits)
//[{name: "Apple", price: 100, color: "red"}, {name: "Orange", price: 150, color: "orange"}]
const colorFilteredFruits = fruits.filter( function(fruit) {
return fruit.color === 'red'; //色が赤いもの
})
console.log(colorFilteredFruits)
//[{name: "Apple", price: 100, color: "red"}, {name: "Strawberry", price: 200, color: "red"}]
const nameLikeFilteredFruits = fruits.filter( function(fruit) {
return fruit.name.match(/Apple/i); //名前が「Apple」を含むもの（大文字小文字問わず）
})
console.log(nameLikeFilteredFruits)
//[{name: "Apple", price: 100, color: "red"}, {name: "Pineapple", price: 250, color: "yellow"}]filter という名前がピンとこないけど Excel のオートフィルタと同じと思えばなるほど。こんなん知らないと for ループまわしちゃうよねぇ。