7 examples of 'findindexof' in JavaScript

13
function findIndexOf(arr, cb) {
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  let idx = -1;
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  arr.some((d, i) => {
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    if (cb(d, i)) {
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      idx = i;
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      return true;
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    }
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    return false;
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  });
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  return idx;
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}

236
function _indexOf(array, searchElement, fromIndex)
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{
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	if(array.indexOf)
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		return array.indexOf(searchElement, fromIndex);
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	else {
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		if(typeof(fromIndex) != "number")
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			fromIndex = 0;
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		for(var index = 0; index < array.length; index ++)
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		{
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			if(array[index] === searchElement)
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				return index;
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		}
249
		
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		return -1;
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	}
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}

236
function indexOf(needle, list) {
237
    _assert(isList(list), "indexOf expects a needle and a list");
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    var i, l;
239
    for (i = 0, l = list.length; i < l; ++i) {
240
        if (needle === list[i]) { return i; }
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    }
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    return -1;
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}

10
export function findIndex<a>(array: A[], callback: (item: A) =&gt; boolean) {
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  const found = array.find(callback);
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  if (found) {
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    return array.indexOf(found);
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  }
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  return -1;
16
}</a>

11
export function findFirst(array, p) {
12
    var low = 0, high = array.length;
13
    if (high === 0) {
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        return 0; // no children
15
    }
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    while (low < high) {
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        var mid = Math.floor((low + high) / 2);
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        if (p(array[mid])) {
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            high = mid;
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        }
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        else {
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            low = mid + 1;
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        }
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    }
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    return low;
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}

12
export function findFirst(array: T[], p: (x: T) => boolean): number {
13
  let low = 0, high = array.length;
14
  if (high === 0) {
15
    return 0; // no children
16
  }
17
  while (low < high) {
18
    let mid = Math.floor((low + high) / 2);
19
    if (p(array[mid])) {
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      high = mid;
21
    } else {
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      low = mid + 1;
23
    }
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  }
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  return low;
26
}

88
export function findNthIndexOfX(array, n = 1, filter) {
89
  if (n < 0) {
90
    const revIndex = findNthIndexOfX([...array].reverse(), -n, filter);
91
92
    return revIndex === -1 ? -1 : array.length - 1 - revIndex;
93
  }
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  let occurrences = 0;
95
96
  return array.findIndex(event => {
97
    if (filter(event)) {
98
      occurrences += 1;
99
      if (occurrences === n) {
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        return true;
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      }
102
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      return false;
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    }
105
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    return false;
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  });
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}