foop
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interfaces that describe their intentions.
243 lines (215 loc) • 21.6 kB
JavaScript
var isUndefined = require('../is/undefined')
var isFunction = require('../is/function')
var isObj = require('../is/obj')
var noop = require('../util/noop')
var toInteger = require('../cast/toInteger')
// underscore.js
// Returns a function, that, as long as it continues to be invoked, will not
// be triggered. The function will be called after it stops being called for
// N milliseconds. If `immediate` is passed, trigger the function on the
// leading edge, instead of the trailing.
/**
* Creates a debounced function that delays invoking `func` until after `wait`
* milliseconds have elapsed since the last time the debounced function was
* invoked. The debounced function comes with a `cancel` method to cancel
* delayed `func` invocations and a `flush` method to immediately invoke them.
* Provide `options` to indicate whether `func` should be invoked on the
* leading and/or trailing edge of the `wait` timeout. The `func` is invoked
* with the last arguments provided to the debounced function. Subsequent
* calls to the debounced function return the result of the last `func`
* invocation.
*
* **Note:** If `leading` and `trailing` options are `true`, `func` is
* invoked on the trailing edge of the timeout only if the debounced function
* is invoked more than once during the `wait` timeout.
*
* If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
* until the next tick, similar to `setTimeout` with a timeout of `0`.
*
* See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
* for details over the differences between `debounce` and `throttle`.
*
* @since 5.0.0-beta.5
*
* @param {Function} func The function to debounce.
* @param {number} [wait=0] The number of milliseconds to delay.
* @param {Object} [options={}] The options object.
* @param {boolean} [options.leading=false]
* Specify invoking on the leading edge of the timeout.
* @param {number} [options.maxWait]
* The maximum time `func` is allowed to be delayed before it's invoked.
* @param {boolean} [options.trailing=true]
* Specify invoking on the trailing edge of the timeout.
* @return {Function} Returns the new debounced function.
*
* @fork 0.1.0
* @category Function
* @func
*
* {@link https://github.com/lodash/lodash/blob/master/debounce.js lodash-debounce}
* @see {@link lodash-debounce}
*
* @example
*
* // Avoid costly calculations while the window size is in flux.
* jQuery(window).on('resize', debounce(calculateLayout, 150))
*
* // Invoke `sendMail` when clicked, debouncing subsequent calls.
* jQuery(element).on('click', debounce(sendMail, 300, {
* 'leading': true,
* 'trailing': false
* }))
*
* // Ensure `batchLog` is invoked once after 1 second of debounced calls.
* const debounced = debounce(batchLog, 250, { 'maxWait': 1000 })
* const source = new EventSource('/stream')
* jQuery(source).on('message', debounced)
*
* // Cancel the trailing debounced invocation.
* jQuery(window).on('popstate', debounced.cancel)
*
*/
function debounce(func, wait, options) {
var lastArgs
var lastThis
var maxWait
var result
var timerId
var lastCallTime
var lastInvokeTime = 0
var leading = false
var maxing = false
var trailing = true
// @TODO this would be coercing
if (!isFunction(func)) {
func = noop
// throw new TypeError('Expected a function')
}
// defaultTo(0)
wait = toInteger(wait)
// const optionsHas = hasIn(options)
if (isObj(options)) {
leading = !!options.leading
maxing = 'maxWait' in options
maxWait = maxing ? Math.max(toInteger(options.maxWait), wait) : maxWait
trailing = 'trailing' in options ? !!options.trailing : trailing
}
function invokeFunc(time) {
var args = lastArgs
var thisArg = lastThis
lastArgs = lastThis = undefined
lastInvokeTime = time
result = func.apply(thisArg, args)
return result
}
function leadingEdge(time) {
// Reset any `maxWait` timer.
lastInvokeTime = time
// Start the timer for the trailing edge.
timerId = setTimeout(timerExpired, wait)
// Invoke the leading edge.
return leading ? invokeFunc(time) : result
}
function remainingWait(time) {
var timeSinceLastCall = time - lastCallTime
var timeSinceLastInvoke = time - lastInvokeTime
var timeWaiting = wait - timeSinceLastCall
return maxing
? Math.min(timeWaiting, maxWait - timeSinceLastInvoke)
: timeWaiting
}
function shouldInvoke(time) {
var timeSinceLastCall = time - lastCallTime
var timeSinceLastInvoke = time - lastInvokeTime
// Either this is the first call, activity has stopped and we're at the
// trailing edge, the system time has gone backwards and we're treating
// it as the trailing edge, or we've hit the `maxWait` limit.
return (isUndefined(lastCallTime) || (timeSinceLastCall >= wait) ||
(timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait))
}
function timerExpired() {
var time = Date.now()
if (shouldInvoke(time)) {
return trailingEdge(time)
}
// Restart the timer.
timerId = setTimeout(timerExpired, remainingWait(time))
}
function trailingEdge(time) {
timerId = undefined
// Only invoke if we have `lastArgs` which means `func` has been
// debounced at least once.
if (trailing && lastArgs) {
return invokeFunc(time)
}
lastArgs = lastThis = undefined
return result
}
function cancel() {
if (!isUndefined(timerId)) {
clearTimeout(timerId)
}
lastInvokeTime = 0
lastArgs = lastCallTime = lastThis = timerId = undefined
}
function flush() {
return isUndefined(timerId) ? result : trailingEdge(Date.now())
}
function debounced(...args) {
var time = Date.now()
var isInvoking = shouldInvoke(time)
lastArgs = args
lastThis = this
lastCallTime = time
if (isInvoking) {
if (isUndefined(timerId)) {
return leadingEdge(lastCallTime)
}
if (maxing) {
// Handle invocations in a tight loop.
timerId = setTimeout(timerExpired, wait)
return invokeFunc(lastCallTime)
}
}
if (isUndefined(timerId)) {
timerId = setTimeout(timerExpired, wait)
}
return result
}
debounced.cancel = cancel
debounced.flush = flush
return debounced
}
module.exports = debounce
// underscore js version
// module.exports = function(func, wait, immediate) {
// let timeout
// let result
//
// const later = function(context, args) {
// timeout = null
// if (args) result = func.apply(context, args)
// }
//
// const debounced = restArgs(function(args) {
// if (timeout) clearTimeout(timeout)
// if (immediate) {
// const callNow = !timeout
// timeout = setTimeout(later, wait)
// if (callNow) result = func.apply(this, args)
// }
// else {
// timeout = delay(later, wait, this, args)
// }
//
// return result
// })
//
// debounced.cancel = function() {
// clearTimeout(timeout)
// timeout = null
// }
//
// return debounced
// }
//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"file":"debounce.js","sources":["debounce.js"],"sourcesContent":["const isUndefined = require('../is/undefined')\nconst isFunction = require('../is/function')\nconst isObj = require('../is/obj')\nconst noop = require('../util/noop')\nconst toInteger = require('../cast/toInteger')\n\n\n// underscore.js\n// Returns a function, that, as long as it continues to be invoked, will not\n// be triggered. The function will be called after it stops being called for\n// N milliseconds. If `immediate` is passed, trigger the function on the\n// leading edge, instead of the trailing.\n\n/**\n * Creates a debounced function that delays invoking `func` until after `wait`\n * milliseconds have elapsed since the last time the debounced function was\n * invoked. The debounced function comes with a `cancel` method to cancel\n * delayed `func` invocations and a `flush` method to immediately invoke them.\n * Provide `options` to indicate whether `func` should be invoked on the\n * leading and/or trailing edge of the `wait` timeout. The `func` is invoked\n * with the last arguments provided to the debounced function. Subsequent\n * calls to the debounced function return the result of the last `func`\n * invocation.\n *\n * **Note:** If `leading` and `trailing` options are `true`, `func` is\n * invoked on the trailing edge of the timeout only if the debounced function\n * is invoked more than once during the `wait` timeout.\n *\n * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred\n * until the next tick, similar to `setTimeout` with a timeout of `0`.\n *\n * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)\n * for details over the differences between `debounce` and `throttle`.\n *\n * @since 5.0.0-beta.5\n *\n * @param {Function} func The function to debounce.\n * @param {number} [wait=0] The number of milliseconds to delay.\n * @param {Object} [options={}] The options object.\n * @param {boolean} [options.leading=false]\n *  Specify invoking on the leading edge of the timeout.\n * @param {number} [options.maxWait]\n *  The maximum time `func` is allowed to be delayed before it's invoked.\n * @param {boolean} [options.trailing=true]\n *  Specify invoking on the trailing edge of the timeout.\n * @return {Function} Returns the new debounced function.\n *\n * @fork 0.1.0\n * @category Function\n * @func\n *\n * {@link https://github.com/lodash/lodash/blob/master/debounce.js lodash-debounce}\n * @see {@link lodash-debounce}\n *\n * @example\n *\n * // Avoid costly calculations while the window size is in flux.\n * jQuery(window).on('resize', debounce(calculateLayout, 150))\n *\n * // Invoke `sendMail` when clicked, debouncing subsequent calls.\n * jQuery(element).on('click', debounce(sendMail, 300, {\n *   'leading': true,\n *   'trailing': false\n * }))\n *\n * // Ensure `batchLog` is invoked once after 1 second of debounced calls.\n * const debounced = debounce(batchLog, 250, { 'maxWait': 1000 })\n * const source = new EventSource('/stream')\n * jQuery(source).on('message', debounced)\n *\n * // Cancel the trailing debounced invocation.\n * jQuery(window).on('popstate', debounced.cancel)\n *\n */\nfunction debounce(func, wait, options) {\n  let lastArgs\n  let lastThis\n  let maxWait\n  let result\n  let timerId\n  let lastCallTime\n\n  let lastInvokeTime = 0\n  let leading = false\n  let maxing = false\n  let trailing = true\n\n  // @TODO this would be coercing\n  if (!isFunction(func)) {\n    func = noop\n    // throw new TypeError('Expected a function')\n  }\n  // defaultTo(0)\n  wait = toInteger(wait)\n  // const optionsHas = hasIn(options)\n\n  if (isObj(options)) {\n    leading = !!options.leading\n    maxing = 'maxWait' in options\n    maxWait = maxing ? Math.max(toInteger(options.maxWait), wait) : maxWait\n    trailing = 'trailing' in options ? !!options.trailing : trailing\n  }\n\n  function invokeFunc(time) {\n    const args = lastArgs\n    const thisArg = lastThis\n\n    lastArgs = lastThis = undefined\n    lastInvokeTime = time\n    result = func.apply(thisArg, args)\n    return result\n  }\n\n  function leadingEdge(time) {\n    // Reset any `maxWait` timer.\n    lastInvokeTime = time\n    // Start the timer for the trailing edge.\n    timerId = setTimeout(timerExpired, wait)\n    // Invoke the leading edge.\n    return leading ? invokeFunc(time) : result\n  }\n\n  function remainingWait(time) {\n    const timeSinceLastCall = time - lastCallTime\n    const timeSinceLastInvoke = time - lastInvokeTime\n    const timeWaiting = wait - timeSinceLastCall\n\n    return maxing\n      ? Math.min(timeWaiting, maxWait - timeSinceLastInvoke)\n      : timeWaiting\n  }\n\n  function shouldInvoke(time) {\n    const timeSinceLastCall = time - lastCallTime\n    const timeSinceLastInvoke = time - lastInvokeTime\n\n    // Either this is the first call, activity has stopped and we're at the\n    // trailing edge, the system time has gone backwards and we're treating\n    // it as the trailing edge, or we've hit the `maxWait` limit.\n    return (isUndefined(lastCallTime) || (timeSinceLastCall >= wait) ||\n      (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait))\n  }\n\n  function timerExpired() {\n    const time = Date.now()\n    if (shouldInvoke(time)) {\n      return trailingEdge(time)\n    }\n\n    // Restart the timer.\n    timerId = setTimeout(timerExpired, remainingWait(time))\n  }\n\n  function trailingEdge(time) {\n    timerId = undefined\n\n    // Only invoke if we have `lastArgs` which means `func` has been\n    // debounced at least once.\n    if (trailing && lastArgs) {\n      return invokeFunc(time)\n    }\n    lastArgs = lastThis = undefined\n    return result\n  }\n\n  function cancel() {\n    if (!isUndefined(timerId)) {\n      clearTimeout(timerId)\n    }\n    lastInvokeTime = 0\n    lastArgs = lastCallTime = lastThis = timerId = undefined\n  }\n\n  function flush() {\n    return isUndefined(timerId) ? 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