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Update for advancement to stage 3 #47

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Update for advancement to stage 3 #47

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c510627
Update for advancement to stage 3.
DanielRosenwasser Jul 14, 2021
7526d1b
fixup: [spec] `npm run build`
DanielRosenwasser Jul 14, 2021
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5 changes: 3 additions & 2 deletions README.md
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Proposal for `.findLast()` and `.findLastIndex()` methods on array and typed array.

## Status
This proposal is a [stage 2 proposal](https://github.com/tc39/proposals#stage-2) and waiting for feedback.

This proposal is a [stage 3 proposal](https://github.com/tc39/proposals#stage-3) and seeking implementation feedback.

## Motivation

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3. **complex index calculation**

So, perhaps we need something directly and effectily. In this proposal, they are `{Array, %TypedArray%}.prototype.findLast` and `{Array, %TypedArray%}.prototype.findLastIndex`.
So, perhaps we need something directly and effectively. In this proposal, they are `{Array, %TypedArray%}.prototype.findLast` and `{Array, %TypedArray%}.prototype.findLastIndex`.

## Scenarios
- You know find from last may have better performance (The target element on the tail of the array, could append with `push` or `concat` in a queue or stack, eg: recently matched time point in a timeline).
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2 changes: 1 addition & 1 deletion docs/index.html
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.normative-optional-tag a {
color: #884400;
}
</style></head><body><div id="menu-toggle">☰</div><div id="menu-spacer"></div><div id="menu"><div id="menu-search"><input type="text" id="menu-search-box" placeholder="Search..."><div id="menu-search-results" class="inactive"></div></div><div id="menu-pins"><div class="menu-pane-header">Pins</div><ul id="menu-pins-list"></ul></div><div class="menu-pane-header">Table of Contents</div><div id="menu-toc"><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-array.prototype.findlast" title="Array.prototype.findLast ( predicate [ , thisArg ] )"><span class="secnum">1</span> Array.prototype.findLast ( <var>predicate</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-array.prototype.findlastindex" title="Array.prototype.findLastIndex ( predicate [ , thisArg ] )"><span class="secnum">2</span> Array.prototype.findLastIndex ( <var>predicate</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-array.prototype-@@unscopables" title="Array.prototype [ @@unscopables ]"><span class="secnum">3</span> Array.prototype [ @@unscopables ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-%typedarray%.prototype.findlast" title="%TypedArray%.prototype.findLast ( predicate [ , thisArg ] )"><span class="secnum">4</span> %TypedArray%.prototype.findLast ( <var>predicate</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-%typedarray%.prototype.findlastindex" title="%TypedArray%.prototype.findLastIndex ( predicate [ , thisArg ] )"><span class="secnum">5</span> %TypedArray%.prototype.findLastIndex ( <var>predicate</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-copyright-and-software-license" title="Copyright &amp; Software License"><span class="secnum">A</span> Copyright &amp; Software License</a></li></ol></div></div><div id="spec-container"><h1 class="version first">Stage 2 Draft / July 5, 2021</h1><h1 class="title">Proposal-array-find-from-last</h1>
</style></head><body><div id="menu-toggle">☰</div><div id="menu-spacer"></div><div id="menu"><div id="menu-search"><input type="text" id="menu-search-box" placeholder="Search..."><div id="menu-search-results" class="inactive"></div></div><div id="menu-pins"><div class="menu-pane-header">Pins</div><ul id="menu-pins-list"></ul></div><div class="menu-pane-header">Table of Contents</div><div id="menu-toc"><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-array.prototype.findlast" title="Array.prototype.findLast ( predicate [ , thisArg ] )"><span class="secnum">1</span> Array.prototype.findLast ( <var>predicate</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-array.prototype.findlastindex" title="Array.prototype.findLastIndex ( predicate [ , thisArg ] )"><span class="secnum">2</span> Array.prototype.findLastIndex ( <var>predicate</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-array.prototype-@@unscopables" title="Array.prototype [ @@unscopables ]"><span class="secnum">3</span> Array.prototype [ @@unscopables ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-%typedarray%.prototype.findlast" title="%TypedArray%.prototype.findLast ( predicate [ , thisArg ] )"><span class="secnum">4</span> %TypedArray%.prototype.findLast ( <var>predicate</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-%typedarray%.prototype.findlastindex" title="%TypedArray%.prototype.findLastIndex ( predicate [ , thisArg ] )"><span class="secnum">5</span> %TypedArray%.prototype.findLastIndex ( <var>predicate</var> [ , <var>thisArg</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-copyright-and-software-license" title="Copyright &amp; Software License"><span class="secnum">A</span> Copyright &amp; Software License</a></li></ol></div></div><div id="spec-container"><h1 class="version first">Stage 2 Draft / July 14, 2021</h1><h1 class="title">Proposal-array-find-from-last</h1>

<emu-clause id="sec-array.prototype.findlast">
<h1><span class="secnum">1</span> Array.prototype.findLast ( <var>predicate</var> [ , <var>thisArg</var> ] )</h1>
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