foop
Version:
interfaces that describe their intentions.
39 lines (34 loc) • 3.32 kB
JavaScript
var ObjectKeys = require('../util/keys')
var isArray = require('../is/array')
var isString = require('../is/string')
var isObj = require('../is/array')
/**
* @desc get first index in a list
* @since 5.0.0-beta.2
* @version 5.0.0-beta.7 <- fixed silly position[0] giving wrong index in arr
* @memberOf fp
*
* @param {Array | Object | string | *} x item to find the first index of
* @return {*} first index, usually number/string
*
* @NOTE works for strings too eh
* @extends deps/util/keysObjOrArray
* @see deps/fp/first
*
* @example
*
* firstIndex([0, 'one']) //=> 0
* firstIndex({one: 1, two: 2}) //=> 'one'
*
*/
function firstIndex(x) {
// any string or array starts @ 0
if (isString(x) || isArray(x)) { return 0 }
// otherwise, object is good, if no keys, use 0, not sure how best to-do
// probably better if this always returned a number, firstKey, firstIndex...
else if (isObj(x)) { return ObjectKeys(x)[0] || '0' }
// any other value, 0
else { return 0 }
}
module.exports = firstIndex
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