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count-items-matching-a-rule_0226.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>count-items-matching-a-rule</title>
</head>
<body>
</body>
<script>
const items = [["phone","blue","pixel"],["computer","silver","lenovo"],["phone","gold","iphone"]];
const ruleKey = "color";
const ruleValue = "silver";
console.log(countMatches(items, ruleKey, ruleValue));
/**
* @param {string[][]} items
* @param {string} ruleKey
* @param {string} ruleValue
* @return {number}
*/
function countMatches(items, ruleKey, ruleValue) {
let count = 0;
let ruleIndex = ['type', 'color', 'name'].findIndex(r => r === ruleKey);
items.forEach((item) => {
if (item[ruleIndex] === ruleValue) ++count;
})
return count
};
// Way2:
// function countMatches(items, ruleKey, ruleValue) {
// let count = 0;
// if(ruleKey === 'type') {
// items.forEach((item) => {
// if (item[0] === ruleValue) ++count;
// })
// }
// if (ruleKey === 'color') {
// items.forEach((item) =>{
// if (item[1] === ruleValue) ++count;
// })
// }
// if (ruleKey === 'name') {
// items.forEach((item) =>{
// if (item[2] === ruleValue) ++count;
// })
// }
// return count
// };
</script>
</html>