Can you aid me in achieving the following output by comparing var1 and var2, and obtaining the output based on var2 where the keys are provided in a string array?
var1 = {a:1, b:2, c:3, d:4};
var2 = ['a', 'd'];
var3 = {a:1, d:4};
let filteredVars = var2.reduce((accumulator, current) => {
if (var1[current]) {
accumulator[current] = var1[current];
}
return accumulator;
}, {})
Utilizing the .forEach method
let object1 = {x:1,y:2,z:3,w:4}; let keys =['x','w'];
let result = {};
keys.forEach(key=>{
result[key] = object1[key]
})
console.log(result)One way to accomplish this task is by utilizing the Object.entries method to iterate through the key-value pairs of an object.
var obj1 = {a:1, b:2, c:3, d:4};
var keysToCheck = ['a', 'd'];
var filteredObj = {};
for(let [key, value] of Object.entries(obj1)) {
keysToCheck.forEach(targetKey => {
if(key === targetKey) {
filteredObj[key] = value;
}
});
}
console.log(filteredObj);
To transform each key in the variable var2 into an object with the key and its corresponding value, you can utilize the .map() method. This mapped array can then be used to assign each object to a new object using Object.assign():
const var1 = {a:1,b:2,c:3,d:4};
const var2 = ['a','d', 'f'];
const var3 = Object.assign({}, ...var2.map(id => id in var1 ? {[id]: var1[id]} : {}));
console.log(var3);Alternatively, you can consider using Object.fromEntries() if your environment supports it:
const var1 = {a:1,b:2,c:3,d:4};
const var2 = ['a','d', 'f'];
const var3 = Object.fromEntries(var2.filter(id => id in var1).map(id => [id, var1[id]]));
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