CODEWITHSUNDEEP
javascriptarraysfilter
sam251
sam251

Reputation: 15

How to filter without using inbuilt function in Javascript?

So I have an array which looks like the one displayed below:

const newTeachers = [
      { firstName: "Steve", subjects: ["English", "Maths", "History"] },
      { firstName: "Celia", subjects: ["Maths", "Science"] },
    ];

I want to create a function which takes in 2 parameters 1 being the array and 2nd being the filter string value.

function fliterSubject(teachers, subject) {

}

I have looked into the inbuilt way which is to implement this line of code:

 return newCandidates.filter(teacher=> teacher.subjects.includes(subject));

However I want to understand how I can filter it manually instead of using the inbuilt filter function.

Upvotes: 1

Views: 2150

Answers (2)

Code Maniac
Code Maniac

Reputation: 37755

Explanation

You can achieve this with a simple for loop.

So you need to loop the array you're getting as argument in function.

Create a temporary array and push the values into it only if certain condition matches and return that array from function.

So something like this :- 

function manuamMap(input, search){

Let temp = [];

for(let i=0; i<limit; i++) {
  if(some confition){
    temp.push();
  }
}

return temp
}

Upvotes: 2

Rehmat
Rehmat

Reputation: 2299

Please check this.

var filterSubject = function(teachers, subject) {
  var filteredTeachers = [];
  for (var i=0; i<=teachers.length-1; i++) {
    var teacher = teachers[i];
    for (var j=0; j<=teacher.subjects.length-1; j++) {
      if (teacher.subjects[j].toLowerCase()== subject.toLowerCase()) {
        filteredTeachers.push(teacher);
      }
    }
  }
  return filteredTeachers;
}

Please check an example @ CodePen https://codepen.io/animatedcreativity/pen/213ddd0a66b73b05c907da72c8aef3e3

Upvotes: 2

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