I have an array of objects with a list of courses and their prices.
const courses = [
{ name: "Courses in England", prices: [ 0, 100] }, //1st object
{ name: "Courses in Germany", prices: [ 500, null] }, //2nd object
{ name: "Courses in Italy", prices: [ 100, 200] }, //3rd object
{ name: "Courses in Russia", prices: [null, 400] }, //4th object
{ name: "Courses in China", prices: [ 50, 250] }, //5th object
{ name: "Courses in USA", prices: [ 200, null] }, //6th object
{ name: "Courses in Kazakhstan", prices: [ 56, 324] }, //7th object
{ name: "Courses in France", prices: [null, null] }, //8th object
];
Here I used the filter method, which kinda works when I want to filter by the course name property.
const filter = courses.filter((obj) => {
return obj.name === "Courses in England";
});
console.log(filter);
returns // { name: "Courses in England", prices: [0, 100] }
Here i used the for loop to get all the objects in the courses array.
const filter = function (arr) {
for (let i = 0; i < arr.length; i++) {
console.log(arr[i]);
}
};
filter(courses);
I can't figure out how to modify the Filter function to accept the prices property which has 2 number element values [100, 200] and for it to only return similar objects in the array with similar range of prices property.
My goal is as follows. For example, when I pass the number 100
it should return:
{ name: "Courses in England", prices: [ 0, 100] }
{ name: "Courses in Italy", prices: [ 100, 200] }
because both objects have the value 100.
that ?
usage is :
let answerArray = courses.filtering( argument_value )
if argument_value is a string,
the answer search all elements where name === argument_value
if argument_value is an array,
the answer search all elements where prices array is the same as argument_value array
if argument_value is null numeric (integer or float)
the answer search all elements where the prices array includes a null value
const courses =
[ { name: 'Courses in England', prices: [ 0, 100] } // 1st object
, { name: 'Courses in Germany', prices: [ 500, null] } // 2nd object
, { name: 'Courses in Italy', prices: [ 100, 200] } // 3rd object
, { name: 'Courses in Russia', prices: [null, 400] } // 4th object
, { name: 'Courses in China', prices: [ 50, 250] } // 5th object
, { name: 'Courses in USA', prices: [ 200, null] } // 6th object
, { name: 'Courses in Kazakhstan', prices: [ 56, 324] } // 7th object
, { name: 'Courses in France', prices: [null, null] } // 8th object
];
courses.filtering = filter_Key =>
{
if (typeof(filter_Key) === 'string')
return courses.filter(obj => obj.name === filter_Key)
if (Array.isArray(filter_Key))
return courses.filter(obj => JSON.stringify(obj.prices) === JSON.stringify(filter_Key))
if (filter_Key===null || Number.isFinite(filter_Key))
return courses.filter(obj => obj.prices.includes(filter_Key))
// if (Number.isInteger(filter_Key))
// return courses.filter(obj =>
// {
// let [min,max] = [...obj.prices].sort((a,b)=>a-b)
// if (min===null) min = max || 0
// if (max===null) max= -1
// return ( min <= filter_Key && filter_Key <= max )
// })
// anything else...
return []
};
console.log('Courses in England ->\n' + JSON.stringify(courses.filtering( 'Courses in England' )))
console.log('\n[100, 200] ->\n' + JSON.stringify(courses.filtering( [100, 200] )))
console.log('\n100 ->\n' + JSON.stringify(courses.filtering( 100 )).replaceAll('},{','}\n,{'))
console.log('\nnull ->\n' + JSON.stringify(courses.filtering( null )).replaceAll('},{','}\n,{')).as-console-wrapper {max-height: 100% !important;top: 0;}
.as-console-row::after {display: none !important;}the prices property which has 2 number element values
loop through all the objects and check that the value for the prices property all has the type of number and return such object.
const result = courses.filter(({ prices }) =>
prices.every(price => typeof price === "number"))
console.log(result)
// With love @kouqhar
for it to only return similar objects in the array with similar range of prices property
you can provide a range of number(s) and then loop through the result filtering the range.
E.g Range of Number between 100 - 500
Your final code will look like the code example below, be free to type with this (price >= 100 && price <= 500) also the && operator with ||
const result = courses.filter(({ prices }) =>
prices.every(price =>
typeof price === "number" && (price >= 100 && price <= 500)))
console.log(result)
// With love @kouqhar