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basic.js
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basic.js
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/*
This file is part of Talkie -- text-to-speech browser extension button.
<https://joelpurra.com/projects/talkie/>
Copyright (c) 2016, 2017, 2018, 2019 Joel Purra <https://joelpurra.com/>
Talkie is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Talkie is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Talkie. If not, see <https://www.gnu.org/licenses/>.
*/
export const shallowCopy = (...objs) => Object.assign({}, ...objs);
export const last = (indexable) => indexable[indexable.length - 1];
export const flatten = (deepArray) => {
if (!Array.isArray(deepArray)) {
return deepArray;
}
if (deepArray.length === 0) {
return [];
}
if (deepArray.length === 1) {
return [].concat(flatten(deepArray[0]));
}
return [].concat(flatten(deepArray[0])).concat(flatten(deepArray.slice(1)));
};
export const isUndefinedOrNullOrEmptyOrWhitespace = (str) => !(str && typeof str === "string" && str.length > 0 && str.trim().length > 0);
export const getRandomInt = (min, max) => {
if (typeof min === "undefined") {
min = Number.MIN_VALUE;
max = Number.MAX_VALUE;
}
if (typeof max === "undefined") {
max = min;
min = 0;
}
if (max === min) {
return min;
}
if (min > max) {
const t = min;
min = max;
max = t;
}
return min + Math.floor(Math.random() * (max - min));
};
// Polyfill for Math.round()
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/round
// TODO: don't add non-standard functions to Math.
// Closure
(function() {
/**
* Decimal adjustment of a number.
*
* @param {String} type The type of adjustment.
* @param {Number} value The number.
* @param {Integer} exp The exponent (the 10 logarithm of the adjustment base).
* @returns {Number} The adjusted value.
*/
function decimalAdjust(type, value, exp) {
// If the exp is undefined or zero...
if (typeof exp === "undefined" || +exp === 0) {
return Math[type](value);
}
value = +value;
exp = +exp;
// If the value is not a number or the exp is not an integer...
if (isNaN(value) || !(typeof exp === "number" && exp % 1 === 0)) {
return NaN;
}
// If the value is negative...
if (value < 0) {
return -decimalAdjust(type, -value, exp);
}
// Shift
value = value.toString().split("e");
value = Math[type](+(value[0] + "e" + (value[1] ? (+value[1] - exp) : -exp)));
// Shift back
value = value.toString().split("e");
return +(value[0] + "e" + (value[1] ? (+value[1] + exp) : exp));
}
// Decimal round
if (!Math.round10) {
Math.round10 = function(value, exp) {
return decimalAdjust("round", value, exp);
};
}
// Decimal floor
if (!Math.floor10) {
Math.floor10 = function(value, exp) {
return decimalAdjust("floor", value, exp);
};
}
// Decimal ceil
if (!Math.ceil10) {
Math.ceil10 = function(value, exp) {
return decimalAdjust("ceil", value, exp);
};
}
})();
export const debounce = (fn, limit) => {
let timeout = null;
let args = null;
const limiter = (...limiterArgs) => {
args = limiterArgs;
clearTimeout(timeout);
timeout = setTimeout(() => {
timeout = null;
Promise.resolve()
.then(() => fn(...args))
.catch((error) => {
// TODO: log/handle success/errors?
throw error;
});
},
limit);
return undefined;
};
return limiter;
};