Utilizing an array for substituting sections of a string: a guide

Question

Utilizing an array for substituting sections of a string: a guide

I have an array of values like ['123', '456', '789']. What is the best way to iterate over this array and update parts of a string that contain the text :id in sequence (e.g. users/:id/games/:id/server/:id)?

Currently, I've been experimenting with using .forEach(), but the original value isn't changing with each iteration. I'm interested in how I can modify the following example to allow me to provide an updated version of the string with one less occurrence of :id.

Objective:

Input: { target: 'users/:id/games/:id/server/:id', ids: ['123', '456', '789'] }

Output: 'users/123/games/456/server/789'

const injectPathVariables = (
  target: string,
  ids: string[]
): string => {
  let newStr: string | undefined;
  ids.forEach(id => {
    if (newStr === undefined) {
      newStr = target.replace(':id', id);
      return;
    }
    newStr.replace(':id', id);
  });
  return newStr;
};

javascript typescript

Answer 1

Answer №1

let text = "users/:id/games/:id/server/:id";
const data = ["123", "456", "789"];
data.forEach((item) => {
  text = text.replace(":id", item);
});

console.log(text);

See it in action.

Answer 2

let text = "users/:id/games/:id/server/:id";
const data = ["123", "456", "789"];
data.forEach((item) => {
  text = text.replace(":id", item);
});

console.log(text);

See it in action.

Answer 3

Answer №2

Using the Array method forEach() iterates over the array elements.

The Array's map() method, on the other hand, not only iterates over the array but also creates a new array with transformed values.

const applyVariables = (
  target: string,
  vals: string[]
): string => {
  let updatedStr: string | undefined;
  vals.map(val => {
    if (updatedStr === undefined) {
      updatedStr = target.replace(':id', val);
      return; // this will replace id with Undefined 
    }
    updatedStr.replace(':id', val);
  });
  return updatedStr;
};

Answer 4

Using the Array method forEach() iterates over the array elements.

The Array's map() method, on the other hand, not only iterates over the array but also creates a new array with transformed values.

const applyVariables = (
  target: string,
  vals: string[]
): string => {
  let updatedStr: string | undefined;
  vals.map(val => {
    if (updatedStr === undefined) {
      updatedStr = target.replace(':id', val);
      return; // this will replace id with Undefined 
    }
    updatedStr.replace(':id', val);
  });
  return updatedStr;
};

Utilizing an array for substituting sections of a string: a guide

Objective:

Answer №1

Answer №2

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