i-item-header qm-api-item-header-object"><span class="qm-api-javascript-header-object qm-api-header-details qm-code-font" id="thisarg"><span class="qm-api-javascript-header-object-name">thisArg</span></span><span class="qm-api-header-tags"></span></div></div></div></div><div class="qm-api-collapsible-content"><div class="qm-api-item-content"><div class="qm-api-description"><div class="qm-html-paragraph">A parameter which lets you supply the &#39;this&#39; context to be used when calling f. The default is to