@glimmer/util/dist/commonjs/es2017/lib/present.js

Common utilities used in Glimmer

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.isPresent = isPresent;
exports.ifPresent = ifPresent;
exports.toPresentOption = toPresentOption;
exports.assertPresent = assertPresent;
exports.mapPresent = mapPresent;

function isPresent(list) {
  return list.length > 0;
}

function ifPresent(list, ifPresent, otherwise) {
  if (isPresent(list)) {
    return ifPresent(list);
  } else {
    return otherwise();
  }
}

function toPresentOption(list) {
  if (isPresent(list)) {
    return list;
  } else {
    return null;
  }
}

function assertPresent(list, message = `unexpected empty list`) {
  if (!isPresent(list)) {
    throw new Error(message);
  }
}

function mapPresent(list, callback) {
  if (list === null) {
    return null;
  }

  let out = [];

  for (let item of list) {
    out.push(callback(item));
  }

  return out;
}
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