Introduction

Simple package to format string template to a new string that is replaced all params with provided variables.

Installation

$ npm install string-interpolation-js

Usage

With array value

import interpole from 'string-interpolation-js';

const source = 'This function can :0 this template with :1 value';

console.log(interpole(source, ['format', 'array'])); // This function can format this template with array value

With object value

import interpole from 'string-interpolation-js';

const source = 'This function can :method this template with :type value';

console.log(
  interpole(source, {
    type: 'object',
    method: 'format',
  }),
); // This function can format this template with object value

What happens if your template has params more than the value you provided?

import interpole from 'string-interpolation-js';

const source = 'This function can :0 this template with :1 value';

console.log(interpole(source, ['format'])); // This function can format this template with :1 value

const source = 'This function can :method this template with :type value';

console.log(
  interpole(source, {
    method: 'format',
  }),
); // This function can format this template with :type value

If you want to remove those redundant params, use this option

import interpole from 'string-interpolation-js';

const source = 'This function can :0 this template with :1 value';

console.log(interpole(source, ['format'], { clearDirtyParam: true })); // This function can format this template with  value

const source = 'This function can :method this template with :type value';

console.log(
  interpole(
    source,
    {
      method: 'format',
    },
    {
      clearDirtyParam: true,
    },
  ),
); // This function can format this template with  value

If you have other pattern for your template, you can pass the pattern as regex or string

import interpole from 'string-interpolation-js';

const source = 'Hello {{ name }}';

console.log(
  interpole(
    source,
    { name: 'Alpha' },
    {
      // if true, there is no additional between specElement and pattern indicator
      exactMatch: true,
      // this is the specified element that is replaced with a key of data in the pattern
      // in this example, the key 'name' is replaced for '_' in the pattern '{{ _ }}'
      specElement: '_',
      pattern: '{{ _ }}',
    },
  ),
); // Hello Alpha

console.log(
  interpole(
    source,
    { name: 'Alpha' },
    {
      exactMatch: true,
      specElement: '_',
      pattern: '{{  _  }}',
    },
  ),
); // Hello {{ name }}

=============================================

const source = 'Hello [[ name ]]';

console.log(
  interpole(
    source,
    { name: 'Alpha' },
    {
      exactMatch: true,
      specElement: '_',
      pattern: '[[ _ ]]',
    },
  ),
); // Hello Alpha

=============================================

const source = 'Hello [[    name         ]]';

console.log(
  interpole(
    source,
    { name: 'Alpha' },
    {
      specElement: '_',
      pattern: '[[ _ ]]',
    },
  ),
); // Hello Alpha

console.log(
  interpole(
    source,
    { name: 'Alpha' },
    {
      exactMatch: true,
      specElement: '_',
      pattern: '[[ _ ]]',
    },
  ),
); // Hello [[    name         ]]

=============================================

const source = 'Hello {{ name }}';

console.log(
  interpole(
    source,
    { name: 'Alpha' },
    {
      pattern: /{{ \w* }}/g,
    },
  ),
); // Hello Alpha

You can pass object value to interpole the string

import interpole from 'string-interpolation-js';

const source = 'Hello {{ user.name }}';

console.log(
  interpole(
    source,
    {
      user: {
        name: 'Alpha',
      },
    },
    {
      // if true, there is no additional between specElement and pattern indicator
      exactMatch: true,
      // this is the specified element that is replaced with a key of data in the pattern
      // in this example, the key 'name' is replaced for '_' in the pattern '{{ _ }}'
      specElement: '_',
      pattern: '{{ _ }}',
    },
  ),
); // Hello Alpha

Changelogs

• 1.0.4: support template literals, it will exclude the pattern if has template literals as prefix

import interpole from 'string-interpolation-js';

const source = 'Hello {{ user.name }} ${{ user.name }}';

console.log(
  interpole(
    source,
    {
      user: {
        name: 'Alpha',
      },
    },
    {
      exactMatch: true,
      specElement: '_',
      pattern: '{{ _ }}',
      templateLiterals: '$',
    },
  ),
); // Hello Alpha {{ user.name }}