8000 feat: add adjacent difference array method by banjoadeola17 · Pull Request #6077 · lodash/lodash · GitHub
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feat: add adjacent difference array method #6077

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feat: add adjacent difference array method #6077

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51 changes: 51 additions & 0 deletions lodash.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2995,6 +2995,28 @@
return result;
}

/**
* The base implementation of `_.adjacentDifference`.
*
* @private
* @param {Array} array The array to inspect.
* @param {Function} iteratee The iteratee invoked per element.
* @returns {Array} Returns the array of adjacent differences.
*/
function baseAdjacentDifference(array, iteratee) {
var index = 0,
length = array.length,
result = Array(length - 1),
previous = iteratee(array[0]);

while (++index < length) {
var current = iteratee(array[index]);
result[index - 1] = current - previous;
previous = current;
}
return result;
}

/**
* The base implementation of `baseForOwn` which iterates over `object`
* properties returned by `keysFunc` and invokes `iteratee` for each property.
Expand Down Expand Up @@ -6918,6 +6940,34 @@

/*------------------------------------------------------------------------*/

/**
* Computes the difference between adjacent elements of `array`.
*
* @static
* @memberOf _
* @since 4.18.0
* @category Array
* @param {Array} array The array to inspect.
* @param {Function} [iteratee=identity] The iteratee invoked per element.
* @returns {Array} Returns the array of adjacent differences.
* @example
*
* _.adjacentDifference([10, 13, 15, 20]);
* // => [3, 2, 5]
*
* _.adjacentDifference([{x:1},{x:4},{x:6}], o => o.x);
* // => [3, 2]
*/
function adjacentDifference(array, iteratee) {
var length = array == null ? 0 : array.length;
if (length < 2) {
return [];
}
iteratee = iteratee == null ? identity : iteratee;
return baseAdjacentDifference(array, iteratee);
}


/**
* Creates an array of elements split into groups the length of `size`.
* If `array` can't be split evenly, the final chunk will be the remaining
Expand Down Expand Up @@ -16671,6 +16721,7 @@
lodash.bindKey = bindKey;
lodash.castArray = castArray;
lodash.chain = chain;
lodash.adjacentDifference = adjacentDifference;
lodash.chunk = chunk;
lodash.compact = compact;
lodash.concat = concat;
Expand Down
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